Here’s a compilation of adapters/power supplies meant for use with guitar pedals. I have not listed pedal-specific power supplies (such as the one that comes with the Whammy, for instance), as they are meant for specific pedals only. I have also not taken my own preferences into account – this is more an effort to present all the options 🙂
Also, in our globalized world, it is becoming increasingly common for manufacturers to sell the same product under various different brand names. When a particular supply starts to crowd the list with too many rebranded copies/spinoffs, I will leave the one I perceive to be the ”original” unit in the main list, and throw its siblings in a separate list at the end. Hopefully, this will make the main list easier to navigate, as well as making it easier to spot the similarities.
| Unit | Type | Isolated outputs | Capacity | Notes |
|---|---|---|---|---|
Accel FX Power Source 8 | Transformer with mains voltage selector. | Yes (stated, not tested) | Adj 9-18vDC, 50mA Adj 5-9vDC, 100mA 4 x 9/12vDC, 100mA 2 x 9vDC, 350mA | Courtesy mains outlet. |
ADL / Pedalgear Juice Box 3 | Toroidal transformer with mains voltage selector. | Yes, in groups | Iso 1,2: four outputs each. 500mA total @ 9vDC for each group. Iso 3: 1 output with 250mA, adjustable from 4.6 to 18vDC Iso 4: 1 output with 250mA, adjustable from 6.5 to 24vDC Iso 5: 1 output with 1500mA at 12vAC | New version of the ADL Juice Box. Iso 1 and 2 has one output each with sag "dying battery simulator" circuit.Courtesy mains outlet. |
Alctron AC2DC (DCT-100) | ? | ? | ? | Looks like a copy of the T-Rex Fuel Tank Classic. Common ground for the 9vDC outputs, 12vDC and 12vAC outputs might be isolated. |
Alctron DCT-200 | Transformer with mains voltage selector. | Yes | Outputs 1-4: 9vDC/100mA or 12vDC/60mA Outputs 5-6: 9vDC/250mA or unregulated (14,5vDC at 50mA load, 12vDC at 200mA load) Outputs 7-8: 9vDC/100mA or variable 12vAC and 12vDC, 250mA each | Also available under other brand names (Fame, Proel, Rifftone etc) - check the "rebranded section" below. |
Amperor Voltz/MilliVoltz | Li-Ion battery pack, switching type charger | Yes | 6000mAh battery. Uses separate isolated converters for various voltages, at approx 500mA max each. | Provides 100% ripple-free DC voltage, as the power source is a battery. Just keep the battery charged, and you're set! |
Artec SPB-8 Power Brick | Switching adapter | No | 8 x 9vDC, 100mA each; two are adjustable 0-12vDC. | Top-loaded connections, so it will not allow pedals placed on top of it. 8 cables included, with right-angle plugs. Each output is individually regulated, but not isolated. |
Artec SPB-12 Power Brick | Switching adapter | No | 10 x 9vDC, 100mA each 2 x selectable 9/12vDC, 300mA each | Top-loaded connections, so it will not allow pedals placed on top of it. Each output is individually regulated, but not isolated. |
Basslab Dual-9-250 | ? (although I'm guessing transformer) | ? | 2 x 9vDC, 250mA | Danish unit with two (isolated?) groups, each with 250mA. |
BBE Supa-Charger | Toroidal transformer with mains voltage selector. | Yes | Six outputs switchable 9/12vDC, 100mA and two switchable 9/16vDC, 200mA. No word yet on if the 16 volt setting is unregulated (like the PP2+ "L6" mode). | Similar to the Pedal Power 2+, but without the "sag" function. |
Belcat PST-10 Power Station | ? | No (most likely) | 8 x 9vDC + two adjustable 6-12vDC | Powered from a 15vDC adapter (1000mA). No info on output mA capability. Also sold in some markets under the Crossfire brand. |
Biyang Pedal-Power | ? | ? | 2 x 9vDC, 1000mA total 3 x 9vDC, 100mA (total?) 2 x ACA (12vDC?), 1000mA total 2 x 6vAC, 1000mA total (for Biyang tube pedals) | From/for the Biyang "Tonefancier" series. The various groups of jacks could be isolated, as they have different mA ratings, but I don't know. |
Boss PSA | Transformer | n/a | 200mA @ 9vDC | The grand-daddy of transformer adapters. |
Boss PSA-120S, 230S | Switching | n/a | 500mA @ 9vDC | New version of the PSA. More current available from digital switching technology. |
Boss PSC | Transformer | n/a | 1000mA @ 9vDC | Originally designed to power the BCB-60 pedal board. It is regulated and has the correct plug polarity, so it should work if you need more power than the PSA can deliver. |
Burkey Flatliner PRO | Toroidal transformer | Yes | 9 individually isolated outputs: 5x9vDC 200mA, 1x12vDC 200mA, 2 adjustable outputs, 1x9/12vAC 1000mA | A very competent power supply. Make sure you have room for it, though - it is quite big. |
Burkey Flatliner SIX | Toroidal transformer | Yes | 6 individually isolated outputs, each with 100mA and selectable 9/12/15/18 volts DC. | |
Burkey Flatliner SIX Junior | Toroidal transformer | Yes | 6 individually isolated outputs, each with 100mA and selectable 9/12 volts DC. | Cheaper/simpler version of the Flatliner SIX. |
Burkey PRO Rectifier | n/a | n/a (although the output that powers it is isolated from the source) | 12vDC, 700mA or 9vDC, 800mA | Add-on unit for the Flatliner PRO, which uses its AC output to provide power to Eventide and TC Nova pedals. |
Caline CP-06, CP-06+ Portable Power | Lithium polymer 8000mAh battery pack | ? (it claims to be, but most likely not) | CP-06: 7 x 9vDC, 100mA 9vDC, 500mA CP-06+: 4 x 9vDC, 100mA 2 x 9vDC, 500mA USB charging port | Comes with a switching type adapter for charging the unit. |
Caline CP-07 | Switching type adapter | n/a | 9vDC, 2000mA | Comes with daisy chain and converter cables. |
Caline CP-08 | Toroidal transformer with mains voltage selector | Yes | 6 x 9vDC, 100mA 2 x 9vDC, 300mA 12vDC, 300mA 18vDC, 300mA | |
Caline CP-09 Tuner-Power | External switching type adapter | No | 6 x 9vDC, 100mA 2 x 9vDC, 500mA | Combined tuner and power supply. Runs off an 18vDC adapter. |
Caline P1 | External switching type adapter | No | 5 x 9vDC, 500mA 9/12vDC, 1000mA 9/15vDC, 1000mA 18vDC, 1000mA | Runs off an 18vDC adapter. The "Isolated Protection" term used refers to short-circuit protection, rather than actual isolation. |
Caline P5 | Transformer with mains voltage selector | Yes (not confirmed) | 2 x 9/12vDC, 100mA 9/18vDC, 100mA 9/12vDC, 300mA 9vDC, 500mA | |
Caline P6 | Transformer with mains voltage selector | Yes (not confirmed) | 8 x 9vDC, 100mA | |
Carl Martin Big John | Transformer | No | 7 outputs with a total of 600mA @ 9vDC | Same unit as the Cioks Big John, but rebranded for Carl Martin. Output connectors are gold plated. |
Carl Martin Powerjack | Switching | n/a | 2000mA @ 9vDC | Switching type supply - works worldwide. |
Carl Martin Pro Power | Transformer (toroidal?) with mains voltage selector. | Yes | 8 isolated outputs, switchable between 9/12vDC. Outputs 1-6: 150/110mA Outputs 7-8: 350/220mA | |
| Cioks (discontinued) | ||||
Cioks AC Rider | Transformer | Yes, in groups | 2 groups of 2 9vDC jacks each, 75mA max per group 9 and 12vAC, 800mA (use either the 9 or 12vAC jack) | A simple solution if you need AC voltages, but don't have too many other pedals |
Cioks Baby 2 | Transformer | Yes, in groups | All outputs 9vDC. 1-4 are shared, 200mA max. Output 5 (100mA) is isolated. | 18vDC possible via special cable (either Booster Flex or Stack Flex). |
Cioks Big John | Transformer | No | 7 shared outputs with a total of 600mA @ 9vDC | 18vDC possible via Booster Flex cable. |
Cioks Double Jack | Transformer | No | 5x9vDC, 2x12vDC - 600mA total | 18vDC (24vDC from the 12 volt outputs) possible via Booster Flex cable. |
Cioks Power Bitch | Transformer | Yes, in sections | 3x9vDC, 150mA total 1x18vDC, 80mA 1x24vDC, 60mA unregulated 1x40vDC, 60mA unregulated | Great unit if you have a few 9vDC pedals and one of the oddball powered Electro-Harmonix ones |
Cioks Schizophrenic | Transformer | Yes | 5 outputs selectable 9/12vDC, 75mA each 1 output selectable 18vDC, 40mA or variable 4-14vDC, 60mA | Basic 9/12vDC unit with isolation and one special output |
| Cioks Standard Link series | ||||
Cioks ADAM Link | Transformer with mains voltage selector. | Yes | Output 1-2: 9 or 12v DC, 100mA Output 3-4: 9v DC, 250mA | Extra slim design to fit under nano-sized pedalboards. |
Cioks AC Rider Link | Toroidal transformer with mains voltage selector. | 6 outputs, in 3 isolated sections. | Output 1-2: 9 or 12v DC, 200mA Output 3-4: 9 or 12v DC, 200mA Output 5-6: 9 or 12v AC, 800mA | Accessory mains outlet can be used to link together with other supplies in the "Link" series, to fit your power supply needs. |
Cioks Big John Link | Toroidal transformer with mains voltage selector. | 6 outputs, in 4 isolated sections. | Output 1-2: 9 or 12V DC, 100mA Output 3-4: 9 or 12V DC, 100mA Output 5-6: 9/12V DC, 400mA each | Accessory mains outlet can be used to link together with other supplies in the "Link" series, to fit your power supply needs. |
Cioks Schizophrenic Link | Toroidal transformer with mains voltage selector. | 6 isolated outputs | Output 1-2: 9/18vDC, 100mA each Output 3-4: 9vDC, 200mA each Output 5-6: 9/12vDC, 200mA each | Accessory mains outlet can be used to link together with other supplies in the "Link" series, to fit your power supply needs. |
| Cioks Professional series | ||||
Cioks AC8 | Toroidal transformer with mains voltage selector. | 8 outputs total, in 5 isolated sections. | Outputs 1-2: 9vDC, 100mA total Outputs 3-4: 9vDC, 100mA total Outputs 5-6: 9/12vDC, 100mA each Outputs 7-8: 9 and 12vAC, 800mA total | Smaller version of the AC10, capable of running a group of normal 9vDC pedals with one AC pedal (Digitech Whammy etc). Comes with mounting kit for Pedaltrain boards. |
Cioks AC10 | Toroidal transformer with mains voltage selector. | 10 outputs total, in 6 isolated sections. | Output 1-2: 9V DC, 100mA Output 3-4: 9/12vDC, 200mA Output 5-6: 9 and 12/15vDC, 600mA* Output 7-8: 9 or 12vAC, 800mA* Output 9-10: 9, 12 or 16vAC, 800mA * one output/section can be used | Capable of running both normal 9vDC pedals and power-hogs like Eventide, TC Nova series, Tonebones etc, plus 9vAC pedals like the Digitech Whammy and some tube pedals. |
Cioks DC8 | Toroidal transformer with mains voltage selector. | 8 outputs total, in 6 isolated sections. | Outputs 1-2: 9vDC, 100mA each Outputs 3-4: 9/12vDC, 100mA each Outputs 5-6: 9 and 12vDC, 300mA total Outputs 7-8: 9 and 12v DC, 300mA total | Smaller version of the DC10. Comes with mounting kit for Pedaltrain boards. |
Cioks DC10 | Toroidal transformer with mains voltage selector. | 10 outputs total, in 8 isolated sections. | Outputs 1-4: 9vDC, 100mA Outputs 5-6: 9/12vDC, 200mA Outputs 7-8: 9 and 12vDC, 400mA total Outputs 9-10: 9 and 12/15v DC, 400mA total | Capable of running both normal 9vDC pedals and power-hogs like Eventide, TC Nova series, Tonebones etc. Comes with mounting kit for Pedaltrain boards. Also available in pink, as the "Pussy Power". |
Cioks TC10 | Toroidal transformer with mains voltage selector. | 10 outputs total, in 8 isolated sections. | Output 1-4: 9vDC, 100mA each Output 5-6: 12vDC, 300mA each Output 7-8: 9 and 12vDC, 300mA total Output 9-10: 9 and 12vDC, 400mA total | Specially designed to run both normal 9vDC pedals and TC electronic pedals |
Cioks Ciokolate | Toroidal transformer with mains voltage selector. | 16 outputs total, in 9 isolated sections. | Output 1: 4-15vDC, 100mA Output 2-4: 9vDC, 100mA Output 5: 18 or 24vDC, 100mA Output 6-7: 9 or 12vDC, 200mA Output 8-9: 9 or 12vDC, 400mA | Output 10-11: 9 and 12 or 15vDC, 400mA *Output 12-13: 9 and 12 or 15vDC, 600mA *Output 14: 9 or 12vAC, 800mA Output 15-16: 9, 12 or 16vAC, 800mA *Use one of these sections |
| Cioks Professional Link series | ||||
Cioks DC5 Link | Toroidal transformer with mains voltage selector. | Yes | 9/12V DC, 300mA 9/12V DC, 300mA 9/18vDC, 100mA 9/12vDC, 100mA 9/12vDC, 100mA | No accessory mains outlet, but the mains input is positioned so it can be powered from another supply in the "Link" series. |
Cioks DC8 Link | Toroidal transformer with mains voltage selector. | Yes | 2 x 9vDC, 100mA 9/18V DC, 100mA 4 x 9/12V DC, 300mA 9-18vDC, 600-300mA | Accessory mains outlet can be used to link to other supplies. |
Cioks DC10 Link | Toroidal transformer with mains voltage selector. | Yes | 2 x 9vDC, 100mA 2 x 9/12V DC, 100mA 2 x 9/12V DC, 200mA 9/12vDC, 400mA 2 x 9vDC, 400mA 9-24vDC, 800-300mA | Accessory mains outlet can be used to link to other supplies. Built in mA meter. |
Cioks Overkill | Toroidal transformer with mains voltage selector. | Yes, 25 of them! | 8 x 9vDC, 100mA 2 x 9/12vDC, 100mA 4 x 9/18vDC, 100mA 2 x 5-9vDC, 100mA 2 x 9/12vDC, 200mA 4 x 9/12vDC, 400mA 2 x 6/9vDC, 400mA 9/12vAC, 1000mA | Accessory mains outlet. |
Cioks PowerFactor 2 | See "Eventide" below | |||
Collins Power Station | Transformer (?) | No | 8 outputs @ 9vDC - 800mA total | The Collins version is sold via www.musik-produktiv.de. The same unit is sold in other parts of Europe, under different names. |
Dan Electrode (Danelectro) DA-4 | ? | No | ? | Can be switched between fixed 9vDC output and adjustable 3-9vDC |
Danelectro Zero Hum (DA-1) | Transformer | n/a | 200mA @ 9.6vDC | Has been reported as having 300mA, but on the adapter itself it says 200, so... |
Decibel 11 Hot Stone SM | Toroidal transformer | Yes (6 sections) | Outputs 1-2: 9 and 12vDC, 300mA Outputs 3-4: 9 and 12vDC, 300mA Outputs 5-8: 9vDC, 100mA each | The first two isolated groups (outputs 1-2 and 3-4) have a 9vDC and 12vDC output, which share 300mA max. The remaining four are separately isolated 100mA outputs for regular pedals.This model is being replaced by the "SMD" below. |
Decibel 11 Hot Stone SMD | Toroidal transformer with mains voltage selector. | Yes (6 sections) | Outputs 1-2: 9 and 12vDC, 400mA Outputs 3-4: 9 and 12vDC, 400mA Outputs 5-8: 9vDC, 100mA each | The first two isolated groups (outputs 1-2 and 3-4) have a 9vDC and 12vDC output, which share 400mA max. The remaining four are separately isolated 100mA outputs for regular pedals.New version which replaces the SM above. |
Decibel 11 Hot Stone HC | Toroidal transformer | Yes (4 sections) | Outputs 1-2: 9 and 12vDC, 400mA Outputs 3-4: 9 and 12vDC, 400mA Outputs 5-6: 9 and 12vDC, 400mA Outputs 7-8: 9 and 12vDC, 400mA | Meant for higher current draw pedals. Each isolated group has a 9vDC and a 12vDC output that share 400mA max. |
Decibel 11 Hot Stone Deluxe | Toroidal transformer with mains voltage selector. | Yes (8 sections) | Outputs 1-2: 9 and 12vDC, 400mA Outputs 3-4: 9 and 12vDC, 400mA Outputs 5-6: 9vDC, 100mA each Outputs 7-8: 9 or 12vDC, 200mA each Outputs 9-10: Variable 5-9vDC, 100mA each | New version - the old version (in the lighter grey box) is the same but with fixed input voltage. |
Diago Powerstation | Switching | n/a | 3000mA @ 9vDC | Looks very much like the laptop power supplies you can buy at electronics supply stores. |
Digitech Hardwire V10 Power Block | Toroidal transformer | Yes | 4 x 9vDC, 140mA 2 x 9/12vDC 140mA (can be merged to 280mA) 2 x 9/12vDC 200mA (can be merged 400mA) 2 x 9vDC/5-12vDC 140mA | |
Dunlop DC Brick (DCB10) | External switching type adapter | No | 7 outputs @ 9vDC, 375mA max 3 outputs @ 18v DC, 625 mA max | Discontinued - replaced by a new unit sold under the MXR brand (scroll down to find it) |
Dunlop ECB003 | Transformer | n/a | 9vDC, 200mA | Earlier model (with the same specs) was named ECB-03. |
Dunlop ECB04 | Transformer | n/a | 18vDC, 150mA | Also available in a digital switching 18vDC/1000mA version (ECB06) which was later replaced by the ECB-004. Those were used to power the DCB10 above. |
Dunlop/CAE Power System | Toroidal transformer | Yes | 8 x 9vDC, 80mA 4 x 18vDC, 125mA 2 variable 6-15vDC, 200mA 2 x 9vAC, 800mA | Designed by Bob Bradshaw. Rackmountable - it's wide, but not as big as it would seem. Courtesy mains outlet. |
EBS AD-9 | Switching | n/a | 1000mA @ 9vDC | 2,4,5 & 6-way daisy chains (DC-x) also available. |
Effectrode Atomic | Switching | Yes | 4 x 12vDC/1250mA | Outputs are center positive. Output 1 is selectable 9/12vDC and center positive/negative. |
Ego Sonoro Zero Noise | Onboard battery pack | No (?) | 8 x 9vDC, 150 mA each 2 x 9vDC, 150 mA each (center positive) 2 x 12vDC, 150 mA each (center positive) | 5A capacity battery. 12vDC charger supplied with unit. |
Ego Sonoro Zero Noise Road | Onboard battery pack | No (?) | 4 x 9vDC, 150 mA each 1 x 9vDC, 150 mA (center positive) 1 x 12vDC, 150 mA (center positive) | 1.3A capacity battery. 12vDC charger supplied with unit. |
Eventide PowerFactor | Toroidal transformer with mains voltage selector. | Yes | 4x9vDC/100mA 3 high-current 9/12vDC outputs | Designed and built by Cioks. |
Eventide PowerFactor 2 | Toroidal transformer with mains voltage selector. | Yes | Outputs 1-2: 9/12vDC, 100mA Outputs 3-4: 9/12vDC, 200mA Outputs 5-6: 9/12vDC, 400mA Outputs 7-8: 12vDC, 400mA | Accessory mains AC output (fits Cioks Link series). Designed and built by Cioks. |
Eventide PowerMax | Switching | Yes | 7 outputs, each selectable: 9vDC/660mA or 12vDC/550mA or 15vDC/400mA or 18vDC/330mA 5vDC/1000mA USB output | 85-265vAC mains input. Low profile (25mm/1"). Designed and built by Cioks. |
Free the Tone PT-3D | External adapter | Yes (3 sections) | 6 x 9vDC, 100mA (common ground) 2 x 9vDC, 500 mA (isolated) | |
Friedman Power Grid 10 | Switching | Yes | 10 x 9vDC, 350mA | Works with 100-240vAC mains voltage. |
Fulltone FPS-1, FPS-2 | Transformer | n/a | 9vDC, 200mA | FPS-1 is regular center negative, while FPS-2 is center positive. |
Gator G-BUS-8 | External switching adapter | No | 1700mA max total 8x9vDC (250mA max/port) 3x18vDC (350mA max/port) | Runs off a separate power supply. |
G-Lab PB-1 | Switching | Yes | 8x9vDC, 350mA max each 1000mA max from each group (1-4 and 5-8) | Outputs 4 and 8 can be switched to reverse polarity. 12 and 15vDC possible via special converter cable available from G-Lab. |
Godlyke Power-All | Switching | n/a | 2000mA @ 9vDC | Comes with daisy chain (5 non-isolated outputs) and 4 cable adapters |
Harley Benton Power Plant | Transformer | No (the two 12 volt outputs may be isolated, but not the 9 volt ones) | 8x9vDC, 500mA total 12vDC + 12vAC, 250mA each | Looks like a copy of the T-Rex Fuel Tank Classic, but with less current from the two 12 volt outputs (which may or may not be isolated, like on the T-Rex). Sold by Thomann in Germany. |
Harley Benton Power Plant JR | Transformer | Yes | 5x9vDC, 120mA each | Quite obvious copy of the T-Rex Fuel Tank JR. Sold by Thomann in Germany. |
J&H Power Supply IS3 | External (switching type?) adapter | In sections (*) | Output 1-3: 9vDC, 300mA each Output 4-5: adjustable 6-9vDC, 300mA *Output 6: 9/18vDC, 100mA *Output 7-8: 9/12vDC, 400mA | Powered from an external 12vDC, 2000mA adapter. Outputs 6-8 isolated (not yet verified). Also sold under the Musicom Lab brand name. |
J&H Power Supply Nano II | External (switching type?) adapter | No | 6x9vDC, 300mA each 9/12vDC, 300mA 9vDC, 300mA/18vDC, 50mA | 1000mA total capacity Original version (not "II") was the same as the Mosky Nano below. |
JHT Power Supply Mini | External switching type adapter | No (possibly one output) | 2 x adjustable 6-12vDC, 480mA max 5 x 9vDC, 480mA (800mA max for the group) 9vDC, 480mA (can be switched to center positive, 20mA max) (1500mA max capacity in total) | LCD display shows output voltage/current draw for each output. One output can be switched to center positive, 20mA max. That output is specifically meant for positive ground pedals, so it must also impart isolation. But that isn't confirmed (yet). Also sold under the Musicom Lab brand name. |
JHT Power Supply Nano | External switching type adapter | No (possibly one output) | 6 x 9vDC, 300mA each 9/12vDC, 300mA 9vDC, 300mA (can be switched to center positive, 20mA max) (1000mA max capacity in total) | One output can be switched to center positive, 20mA max. That output is specifically meant for positive ground pedals, so it must also impart isolation. But that isn't confirmed (yet). Very similar to the old Mosky Nano below. Also sold under the Musicom Lab brand name. |
Joyo Power Tune JF-18 | External switching type adapter | ? (most likely no) | 6x9vDC, 100mA 2x9vDC, 500mA | Combined tuner and power supply. |
Joyo Power Supply JP-01 | External switching type adapter | No | 8x9vDC, 2x18vDC | |
Joyo Power Supply JP-02 | External switching type adapter | No | 8x9vDC, 1x12vDC, 1x18vDC | Claimed to have isolated outputs, but doesn't. The "isolation" they mention is actually short circuit protection. Also sold under many other brand names - see the "rebranded" section below. |
Joyo Power Supply 4 (JP-04) | R-core (semi-toroidal) transformer | Yes (not verified) | 5 x 9vDC, 100mA 2 x 9vDC, 250mA 12/18vDC, 100mA | Courtesy mains outlet. |
Masotti Feed Box | Separate power supply (not suppiled) | No | 4 outputs @ 9vDC, 600mA total 1 variable 7-12vDC, 100mA max | Use any power supply with 13-20 volts DC or AC, 800mA or bigger (13.5vAC/1000mA nominal). Unit is MXR-sized. |
Masotti PW-4 | Transformer | Yes, in groups | 4 isolated groups with 2 outputs each. Groups 1-3 are 9vDC/100mA, while group 4 is 9vDC/250mA. | Can be ordered with custom voltage (5/9/12/15/18vDC) in one group, and/or one group with variable voltage. |
Maxon AC2009 | Switching | n/a | 2000mA @ 9vDC | Digital switching type, also sold as a kit with a distribution box. |
Mission Engineering 529 | Powered via USB (type B at the input of the 529) | Yes | 4 x 9vDC, 150mA 1 x 9vDC, 500mA | Type A USB output can be used to link to a second 529. |
Modtone Power Cell | External adapter | No | 8 x 9vDC, 2000mA total | |
Modtone Power Plant | Toroidal transformer with mains voltage selector. | Yes | Version 1: 5 x 9/12vDC, 150mA 2 x variable 4-9vDC, 150mA 1 x 9vAC, 1000mA Version 1.3: 5 x 9/12vDC, 100mA 2 x variable 4-9vDC, 200mA 1 x 9vAC, 1300mA | Courtesy mains outlet. Sadly, my own (version 1) unit induced a hum in the 9vAC-powered pedal, a problem that seems to have been fixed in the latest (version 1.3) model. |
Moen MISO-8 | Transformer | Yes (?) | Output 1: variable 9-18vDC, 50mA Output 2: variable 5-9vDC, 100mA Outputs 3-6: 9/12vDC, 100mA Outputs 7-8: 9vDC, 350mA | Courtesy mains outlet |
Mooer Macro Power S8 | Transformer with input voltage selector | Yes (not confirmed) | 1 selectable 9/12/15/18vDC, 200mA 3x9vDC, 200mA each 4x9vDC, 400mA total | Outputs 1-4 are isolated, while outputs 5-8 share a single source. |
Mooer Micro Power | External 12vDC adapter | No | 8 x 9vDC, 300mA each | While it says "isolated outputs" on the box, it is actually not isolated. |
Moollon MPS-12 Power Supply | Toroidal (?) transformer | Yes | Outputs 1-9: 9vDC, 100mA / 12.3vDC, 70mA Outputs 10-12: 9vDC, 250mA / 12.3vDC, 200mA | Shown at NAMM 2011, and then nothing happened. It isn't listed on the Moollon website, but seems to be available from a few dealers. |
Morley GS-1 Gas Station | External adapter | No | 8 x 9vDC, 250mA max each (600mA max total load) | Since the max capacity of the supplied adapter powering the GS-1 is 600mA, expect the actual useable max current to be 500mA max (still 250mA max from any one output). |
Mosky C8 Power Station | Toroidal transformer with input voltage selector. | Yes (not confirmed) | 3 x 9/12vDC, 100mA 2 x 9/12vDC, 300mA 9/18vDC, 100mA 2 x 9/4-9vDC, 100mA | The 9/12vDC outputs state the same mA capacity in both settings. IRL, the mA should be lower in the 12vDC setting. |
Mosky DC Core 10 | External switching type adapter | No | 7 x 9vDC, 100mA 9vDC, 500mA 12vDC, 100mA 18vDC, 100mA | It says "isolated outputs", but it is clearly not so. Also sold under the "Coween" brand. |
Mosky DC Tank | External switching type adapter | No | 5 x 9vDC, 100mA 9vDC, 500mA | It says "isolated outputs", but it is clearly not so. Also sold under the "Coween" brand. |
Mosky ISO 6 Power Station | Toroidal transformer with input voltage selector. | Yes (not confirmed) | 4 x 9/12vDC, 500mA 9vAC, 1300mA 12vAC, 500mA | The 9/12vDC outputs state the same mA capacity in both settings. IRL, the mA should be lower in the 12vDC setting. |
Mosky Nano Pedal Power Station | External switching type adapter | No | 6 x 9vDC, 300mA each 9/12vDC, 300mA 9vDC, 300mA (can be switched to center positive, 20mA max) (1000mA max capacity in total) | One output can be switched to center positive, 20mA max. That output is specifically meant for positive ground pedals, so it must also impart isolation. But that isn't confirmed (yet). |
Mosky Zip | Transformer | Yes | 1-4: 9vDC/100mA (switchable to 12vDC). 5-6: 9vDC/300mA (switchable to unregulated). 7-8: 9vDC/100mA (switchable to adjustable 4-9vDC) | Specs are similar to the Voodoo Lab Pedal Power 2+, although the transformer is lower quality (semi-toroidal/R-type instead of fully toroidal). Courtesy mains outlet. |
Mosky Zip | Transformer | Yes | 1-4: 9vDC/100mA (switchable to 12vDC). 5-6: 9vDC/300mA (switchable to unregulated). 7-8: 9vDC/100mA (switchable to adjustable 4-9vDC) | Specs are similar to the Voodoo Lab Pedal Power 2+, although the transformer is lower quality (semi-toroidal/R-type instead of fully toroidal). Courtesy mains outlet. |
MXR DC Brick (M237) | External switching type adapter | No | 8 x 9vDC, 1200mA total 2 x 18vDC, 800mA total | New version of the DC Brick. Uses regular center negative 2.1mm barrel type jacks for all outputs. |
MXR Iso-Brick (M238) | External 18vDC adapter | Yes | 2 x 9vDC, 100mA 2 x 9vDC, 300mA 2 x 9vDC, 450mA 2 x 18vDC, 250mA 2 x variable 6-15vDC, 250mA | All outputs isolated (as opposed to the DC Brick). |
N-Audio Powerbox MK2 | Transformer (voltage selector optional) | 10 outputs, in 5 isolated sections. | Section 1 and 2 (outputs 1-2, 3-4): 9/12vDC, 520/240mA per section Section 3 (outputs 5-6): 9/15/18/24vDC, 600-100mA (higher voltage. lower current) Section 4 and 5 (outputs 7-8, 9-10): 9vDC, 100mA per section | Each section has two outputs that share current capacity and voltage setting. So you could call it a 5 output supply with twin jacks for each output. Specs listed are for the updated (may 2016) version. |
N-Audio Powerbox MK2 Pro | Transformer | 12 outputs, in 7 isolated sections. | Section 1 and 2 (outputs 1-2, 3-4): 9/12vDC, 500mA per section Section 3 (outputs 5-6): 9/12/15/18vDC, 250mA Section 4 and 5 (outputs 7-8, 9-10): 9vDC, 50mA per section Section 6 and 7 (outputs 11 and 12): 9vAC, 1200mA each | Basically a Powerbox Mk2 with two additional 9vAC outputs. |
N-Audio Powerbox Pro | Transformer (voltage selector optional) | 14 outputs, in 7 isolated sections. | Section 1 and 2 (outputs 1-2, 3-4): 9vAC, 1500mA or 9/12vDC, 650/210mA Section 3 and 4 (outputs 5-6, 7-8): 9/12vDC, 540/240mA Section 5 (outputs 9-10): 9/15/18/24vDC, 600/400/300/100mA Section 6 and 7 (outputs 11-12, 13-14): 9.5vDC, 100mA | New Pro version (replacing the Mk2 Pro above) |
One Control Micro Distro | External switching type adapter | No | 8 linked 9vDC outputs (1950mA total with supplied adapter) One 12-18vDC adjustable output (50mA max) | Basically a daisy chain in a box. Adjustable output limited to 50mA. |
Palmer PWT05 | ? | ? | 5 9vDC outputs. Capacity currently unknown. | Pic borrowed from effectsdatabase.com |
Palmer PWT05 MkII | Transformer with mains voltage selector | Yes | 5 x 9vDC, 250mA | |
Palmer PWT08 | External switching adapter | 3 sections (not verified). Group 1: 6x9vDC Groups 2 and 3: 9/12/18vDC | 6 x 9vDC, 150mA each 2 x selectable 9/12/18vDC, 500mA | Very similar to the Vitoos DC8, but with more reasonable mA figures. |
Palmer PWT-12 | Toroidal transformer with mains voltage selector. | Yes, in pairs | Outputs 1-8, 11-12: 9vDC, 250mA per pair Outputs 9-10: 18vDC, 125mA per pair | Outputs 7-8 switchable to reverse polarity. Output 9 switchable to 12vDC. Outputs 11-12 switchable to 12vAC. |
Pedal Pad Power Pad | Switching | No | 8 outputs @ 9vDC, 1670mA total.Courtesy mains outlet. | Digital switching power supply with daisy chain-style outputs (common ground). |
Pedaltrain Powertrain 1250 | Transformer with mains voltage selector. | Yes, in groups | Output 1: 9/12/15/18vDC, 150mA Outputs 2-4: 9vDC, 210mA each with adjustable sag feature Outputs 5-8: 9vDC, 500mA combined | |
Pedaltrain Volto | Battery pack | No | 9vDC, 2000mA max (battery capacity is 5000mAh) | Designed to fit underneath Pedaltrain pedalboards. Comes with charger and daisy chain cables. |
Pigtronix Power | Transformer with mains voltage selector | Yes | 2 x 9vDC, 100mA 2 x selectable 9/12/15/18vDC, 100mA 2 x selectable 9/12/15/18vDC, 300mA 2 x 18vDC, 300mA | |
Providence Provolt 9 | External 12vDC adapter | No | 6 x 9vDC, 100mA each | |
Rifftone M-80 Power Station | External 18vDC adapter | No | 8 x 9vDC, 100mA each 12vDC, 100mA 18vDC, 100mA | The manufacturer mentions a special 9vDC, 500mA output below the 12vDC output, but I can't see it in the photos. |
Rifftone RT-12 Performer 2 | Transformer with mains voltage selector | Yes (stated, not verified) | 3 x 9/12vDC, 100mA 2 x 9/12vDC, 300mA 9/18vDC, 100mA 2 x 9vDC/4-9vDC, 100mA | |
Riot Black Box DCT100 | Transformer | No (the two 12 volt outputs may be isolated, but not the 9 volt ones) | 8x9vDC, 500mA total 12vDC + 12vAC, 250mA each | Same unit as the Harley Benton Power Plant. A copy of the T-Rex Fuel Tank Classic, but with less current from the two 12 volt outputs (which may or may not be isolated, like on the T-Rex). |
Riot DC Power | Switching | n/a | 9vDC, 800mA | |
Rocktron DC OnTap | Switching | n/a | 1670mA @ 9vDC | Comes with daisy chain and cable adapters. Specs are very similar to the 1spot and Godlyke Power-All. |
Rocktron PowerTap | Transformer | Yes | Outputs 1-5: 9/12vDC, 150mA Outputs 6-7: adjustable 4-9vDC, 400mA Output 8: 9vAC, 1300mA | Three accessory mains AC outputs. |
Rothwell Stompjuice | Transformer with mains voltage selector. | No | 6 outputs with a total of 600mA @ 9vDC | |
Sanyo Pedal Juice | Rechargeable battery pack | No | Approx 2Ah. Battery time varies with the load (1 hour at 2000mA, 7 hours at 300mA, 50 hours at 10mA). Do take those time estimates with a grain of salt, though - as with any battery, the voltage usually drops below the useable range well before the supply runs out. | About the same size as a pedal. Also available in black, if you so desire 🙂 |
Signal Flex PS-9 | Transformer | No | 5 outputs @ 9vDC, 450mA total. | The same unit seems to appear under several different names ("Power Bank" and "Sound Lab", among others). See the "rebranded" section below. |
SKB PDU12 | Transformer with mains voltage selector. | All outputs individually isolated | 2x9vAC/1300mA 2 variable 4-12vDC 4x9vDC 2x18vDC 2 selectable 9/12vDC All DC outputs 100mA | 1HE rack unit, same as the power section on the PS-55 pedalboard. All outputs selectable polarity. Unit also contains a cable tester. |
Strymon Ojai | Separate 24vDC switching adapter | Yes | 5 x 9vDC, 500mA each | 24vDC output allows you to link more Ojais together, for more outputs. |
Strymon Ojai R30 | Separate 24vDC switching adapter | Yes | 3 x 9vDC, 500mA each 2 x 9/12/18vDC (500/375/250mA each) | 24vDC output allows you to link more Ojais together, for more outputs. |
Strymon Zuma | Switching | Yes | 7 x 9vDC, 500mA each 2 x 9/12/18vDC (500/375/250mA each) | 24vDC output allows you to link to an Ojai or Ojai R30, for more outputs. |
Strymon Zuma R300 | Switching | Yes | 4 x 9vDC, 500mA each 1 x 9/12/18vDC (500/375/250mA) | 24vDC output allows you to link to an Ojai or Ojai R30, for more outputs. |
Swiff P100 Adjustable Power | Separate 24vDC switching adapter | No | 6 x 9vDC, 100mA each 2 x 9/12vDC, 300mA each 1 x adjustable 9-24vDC, 300mA | All jacks on top of unit. Voltage display (possibly to show setting of adjustable output). |
The GigRig Generator | Switching | n/a (the unit is used to link to distributor and isolator units) | 9vDC/5000mA | The "engine" for a fully modular system from The GigRig. |
T-Rex Fuel Tank Chameleon | Transformer with mains voltage selector. | Yes | All outputs are 300mA (output 4 is 150mA when switched to 18vDC). 1-3: 9/12vDC 4: 9/18vDC 5: 9/12vDC 6: 12vAC. | Outputs 5 and 6 should not be used simultaneously. |
T-Rex Fuel Tank Classic | Transformer with mains voltage selector. | In groups | 9 outputs @ 9vDC, 500mA total (not isolated), isolated 12vDC and 12vAC outputs w/ 500mA each | All 9vDC outputs are wired in parallel. |
T-Rex Fuel Tank Goliath | Transformer with mains voltage selector. | Yes | 5 outputs @ 9/12vDC, 450mA 18vDC, 250mA 12vAC, 450mA | |
T-Rex Fuel Tank Juicy Lucy | Transformer | Yes | 5 outputs w/ 12vDC, 300mA each. Supplied "current doubler" cable combines two outptuts for 600mA. | Designed to run the more power-hungry T-Rex pedals (Replica, Roommate etc), but will work with anything that can handle 12 volts DC. |
T-Rex Fuel Tank JR | Transformer with mains voltage selector. | Yes | 5 outputs with 9vDC, 120mA each. Supplied "voltage doubler" cable combines two outputs for 18vDC, 120mA. | Smaller and less powerful than the regular Fuel Tank, but with isolated outputs. Original version with attached mains cable did not have 115/230 voltage selector. |
Truetone 1-spot | Switching | No | 1700mA @ 9vDC | Lots of accessories (daisy chains, various converter cables etc) available. Originally sold under the Visual Sound brand. |
Truetone 1-spot Pro CS 6 | Switching | Yes | 2 x 9vDC, 500mA 2 x 9/18vDC, 100mA 2 x 9/12vDC, 200mA | 100-240vAC mains input. |
Truetone 1-spot Pro CS 7 | Switching | Yes | 18vDC, 100mA 4 x 9/12vDC, 200mA 2 x 9vDC, 500mA | 100-240vAC mains input. |
Truetone 1-spot Pro CS 12 | Switching | Yes | 2 x 18vDC, 100mA 4 x 9/12vDC, 100mA 9 or 4-9vDC, 100mA 2 x 9vDC, 250 mA 2 x 9vDC, 500mA 9vAC, 800mA (5.5x2.5mm jack) | Mains voltage selector. |
Vinteck L'overpowersupply | External transformer | No (?) | 10 individually regulated outputs, selectable 9/12vDC, 2 12vAC. 3000mA max total. | No mention of isolation (which, since the transformer is in a separate box, would be hard to do). Also available with a buffer/line driver section. |
Vitoos DC8 Power Pack | External switching adapter | Yes, in 3 sections | 6x9vDC, 300mA 2 x selectable 9/12/18vDC, 1000mA (2000mA max capacity total) | Powered from a separate 12vDC/2000mA switching type adapter. |
Vitoos ISO4, ISO4S, ISO4SE | External DC adapter | Yes (not verified) | 4x9vDC, 800mA* | *Note that the actual max capacity depends on the power supply you use to feed it. Input voltages: ISO4: 9vDC ISO4S: 9-18vDC ISO4SE: 5-18vDC |
Vitoos ISO4 Plus | External 12vDC adapter | Yes (not verified) | 8x9vDC, 500mA* | *Powered from a 12vDC/2A adapter, so don’t expect to be able to use all 8 outputs at their max capacity. |
Vitoos ISO8 | External switching adapter | Yes (not verified) | 6x9vDC, 300mA each 2 x selectable 9/12/18vDC, 500mA each (2000mA max capacity total) | Powered from a separate 12vDC/2000mA switching type adapter. |
Vitoos VP1 (DC-10X) | External switching adapter | No | 8x9vDC, 150mA each 2x18vDC, 1000mA total | Powered from a separate 18vDC/2000mA switching type adapter. |
Vitoos VP2 | External transformer | No | 8x9vDC, 75mA each | Powered from a separate 9vDC/600mA linear (transformer-based) adapter. Later models may come with a more powerful adapter, raising the available power from each output. |
Voodoo Lab Pedal Power 2 Plus | Toroidal transformer | Yes | 8 isolated outputs. 1-4: 9vDC/100mA (switchable to 12vDC/60mA). 5-6: 9vDC/250mA (switchable to unregulated for Line 6 modelers). 7-8: 9vDC/100mA (switchable to adjustable 4-9vDC). | Two outputs can be combined in series to double the voltage, or in parallel to double the mA. Courtesy mains outlet. |
Voodoo Lab Pedal Power AC | Toroidal transformer | Yes | 4 isolated outputs. 2 x 9vAC, 600mA; 2 pairs of outputs with 9 and 12vAC, 1200 mA respectively (choose either the 9 or 12 volt output from each pair). | Same size as the PP2+. Courtesy mains outlet. |
Voodoo Lab Pedal Power Digital | Toroidal transformer (?) | Yes, in groups | Group 1 and 2: 9 and 12vDC, 400mA (choose either the 9 or 12 volt output from each pair) Group 3 and 4: 9vDC, 400mA | Designed to run higher-current pedals like Eventides etc. Pic borrowed from effectsdatabase.com |
Voodoo Lab Pedal Power ISO5 | Toroidal transformer | Yes | 3 x 9vDC/100mA (isolated) 9 and 12vDC, 300mA (isolated from the others, but not from each other) 1 x 18vDC, 100mA (isolated) | Smaller version of the Pedal Power 2+. Five isolated outputs/groups. The 9 and 12v/300mA outputs share the same source, so if you use both, the total draw can't be more than 300mA. |
Voodoo Lab Pedal Power 4x4 | Toroidal transformer | Yes | 2 x 9/12vDC, 400mA 2 x 9vDC, 400mA 4 x 9vDC, 100mA | |
Voodoo Lab Pedal Power Mondo | Toroidal transformer | Yes | 2 x 9/12vDC, 400mA (two isolated groups - the 9 and 12v jacks are not isolated from each other) 2 x 9vDC, 400mA 4 x 9vDC, 100mA (switchable to 12vDC/60mA) 2 x 9vDC, 250mA (switchable to unregulated for Line 6 modelers) 2 x 9vDC, 100mA (switchable to adjustable 4-9vDC) | Basically a Pedal Power Digital and Pedal Power 2+ combined into the same box.Courtesy mains outlet. |
Voodoo Lab Pedal Power X4 | External switching adapter | Yes | 4 x 9vDC, 500mA (1000mA max total) | Powered from an external 12vDC, 1000mA supply. Can also be powered from a 12vDC, 400mA output on one of the other VL supplies (presumably with a lower max total capacity). |
Walrus Audio Aetos | Toroidal transformer | Yes | 6 x 9vDC, 100mA 2 x 9vDC, 250mA | Courtesy mains outlet. |
Walrus Audio Phoenix | 2 x toroidal transformer | Yes | 8 x 9vDC, 100mA 4 x 9vDC, 300mA 2 x 9/12vDC, 100mA 9/18vDC, 100mA | Courtesy mains outlet. |
Yankee HS-M10 | Toroidal transformer with voltage selector | Yes | Iso 1: 9vAC, 12vAC or 9/12vDC, 1300mA Iso 2: 9/12vDC, 400mA Iso 3: 9/12/22/24vDC, 400mA Iso 4: 9/12/15/18vDC, 400mA Iso 5-7: 9vDC, 400mA Iso 8: 1-10vDC, 400mA | Movable IEC mains input (rear or top location). USB port (1.1A). |
Yankee HS-M12 | Toroidal transformer with voltage selector | Yes | Iso 1: 9vAC, 16vAC or 9/12vDC, 1300mA Iso 2: 9vAC, 12vAC or 9/12vDC, 1300mA Iso 3-4: 9/12vDC, 500mA Iso 5-7: 1-24vDC, 800mA Iso 8: 1-24vDC, 1100mA | Movable IEC mains input (rear or top location). USB port (1.1A). Onboard voltage meters for the adjustable outputs. |
Yankee HS-M24 | Toroidal transformer with voltage selector | Yes, in 18(!) sections | Iso 1-7: 9vDC, 400mA Iso 8-9: 9/12vDC, 600mA Iso 10: 9, 12 or 14vAC, 1300mA Iso 11: 9vAC, 16vAC or 9/12vDC, 1300mA Iso 12: 9vAC, 12vAC or 9/12vDC, 1300mA Iso 13-14: 9/12vDC, 500mA Iso 15-17: 1-24vDC, 800mA Iso 18: 1-24vDC, 1100mA | Movable IEC mains input (rear or top location). USB port (1.1A). Onboard voltage meters for the adjustable outputs. |
Yankee PS-M0 | Toroidal transformer | Yes | Two isolated outputs with 9vDC, 900mA each | Movable IEC mains input (rear or top location). 120vAC model available on request. |
Yankee PS-M1 | Toroidal transformer | Yes, in sections | Iso 1: 5x9vDC, 1200mA total Iso 2: 5x9vDC, 1200mA total | Movable IEC mains input (rear or top location). USB port with supplied diode lamp for lighting up pedalboard. 120vAC model available on request. |
Yankee PS-M12 | Toroidal transformer | Yes, in sections | Iso 1: 5x9vDC, 900mA total Iso 2: 2 x selectable 6-24vDC, 600mA total Iso 3: 9vAC, 12vAC 1200mA total (use only one output at a time) | Movable IEC mains input (rear or top location). USB port with supplied diode lamp for lighting up pedalboard. 120vAC model available on request. |
Yankee PS-M2 | Toroidal transformer | Yes, in sections | Iso 1-2: 9vDC, 1200mA each (5 outputs per section) Iso 3: 2 x adjustable 1-10vDC, 600mA total Iso 4: 2 x selectable 6-24vDC, 600mA total Iso 5: 9vAC, 12vAC, 14vAC, 2000mA total | Movable IEC mains input (rear or top location). USB port with supplied diode lamp for lighting up pedalboard. 120vAC model available on request. |
Yankee PS-9/1800 | Toroidal transformer | Yes, in sections | Two isolated sections with 9vDC, 900mA each | Integrated daisy chains with 4 plugs per isolated section. 230vAC only. |
Yankee PS-9/1000, PS-9/700 | Transformer | No | 9vDC, 1000 or 700mA | Integrated daisy chain with 6 (PS-9/1000) or 4 (PS-9/700) plugs. 230vAC only. |
Yankee PS-9/120, PS-18/90 | Transformer | No | 9vDC, 120mA or 18vDC, 90mA | 230vAC only. |
The rebranded section |
||||
"Original" unit | Rebranded units | |||
Alctron DCT-200 | Fame DCT-200 | Proel PSU110 | Rifftone RT-10 | |
Joyo JP-02 | Ashton Powerbar | Budagov Jericho 2 | Accel FX Power Source 10M (mounting flanges added to the body) | Caline CP-05 |
| Donner DP-1 Pedal Power | Mosky DC Core 10 | Nordell Audio Power Core | Vitoos PS1 | |
| AGPtek 10 Isolated Output | ||||
Signalflex PS-9 | Power Bank (Maplin) | Sound Lab Pedal Power 450 | ||
Note: most pictures are from manufacturer’s websites, or as supplied by manufacturers to retailers. If you (as the manufacturer or retailer) feel a picture is misrepresenting your product and you want me to take it down, or if you have a better one you’d rater I use, e-mail me at andreas (at) stinkfoot.se and I’ll be happy to oblige.
The golden rules of using power supplies:
Get a proper adapter. If it isn’t specifially made for audio applications (i.e. if it’s a generic ”will replace all adapters” type), it’s not made for audio applications, and shouldn’t be used. Yes, the same rules still apply – get the plug polarity, voltage and current (mA) capacity right, and it will work – but it probably isn’t well enough filtered. Your rig will show its dislike by humming loudly…
Get to know your pedals – before you plug in any adapter. Find out what kind of power they want (AC or DC), how much of that power they want (current draw in mA), and how it wants it delivered (plug/jack polarity). If the pedal says ”9vAC” or ”9v ~”, you can’t use the same adapter as to your Boss pedals. AC means ”alternating current”, which alters direction 50-60 times per second. DC means ”direct current”, which flows evenly from positive to negative. Also, if you plan on buying a switching type adapter, make sure it will not clash with your delay/reverb etc pedals (digital pedals and clock-based analog ones) – if you hear a faint whining sound, the switching adapter will not work for you, and the only recourse is to get a transformer based adapter.
Forget the terms ”negative tip” and ”positive tip” – those terms apply to the 1/8″ mini tele plug that to my knowledge now only is used on the ProCo RAT, the Ibanez reissue TS-808 and the old-style DOD pedals (all of which want a positive tip, btw). You might also find one or two Electro-Harmonix pedal in this group (beware, though – not all of the E-H pedals use 9 volts DC). All other ”normal” pedals use a 2.1mm barrel type plug, with the positive carried on the outside of the plug. The center pin in the adapter jack is therefore negative, and the term is ”center negative”. But plug polarity is one thing – ground polarity is another thing you need to know about. Again, most pedals (all ”normal” effects such as Boss, Ibanez etc) are the same – they have negative ground (battery ”-” goes to ground). But some effects – mainly ”boutique-type” germanium fuzz pedals – have positive ground instead. On those pedals, the adapter jack polarity is normally also reversed, but they don’t have to be – it doesn’t have anything to do with the fact that they are positive ground. The main thing to remember is that you can’t feed these pedals power from the same source (daisy chain or non-isolated psu) as you use for the others – that will short the entire power supply out, and make your pedals go quiet (at best – at worst, your gear will be damaged). For those pedals, you have to either use batteries, get a separate adapter (check the plug polarity), or get a psu with isolated outputs. Check the list above – there are only a handful of power supplies with isolated outputs.
You can never have too much power. You can kill your pedals with too much voltage, but not by the adapter having too much current. The pedals will only draw as much current as they need, regardless of the amount available from the adapter. But the bigger the adapter, the less strain you’re putting on it. A rig that draws 185 mA in total really needs a bigger adapter than 200mA – you don’t keep your car in first gear, at 5000 rpm, just because the redline is at 6000, do you? So, basically, unless there are other limitations – such as finances, for instance, or that you’re using the ”power thru” jack on a Boss TU-2/LS-2/NS-2/PSM-5 (which aren’t guaranteed for more than 200mA) – get quite a bit more than you technically need.