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Old 10th May 2006, 01:24 AM   #1
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Default Swapping an A/C Adapter

Most of my stomp pedals are daisy chained off of the Boss PSA120T A/C Adapter. Trouble is, I have the Electro Harmonix Small Clone Chorus which uses a different power jack.

What I'd like to do is replace the power jack on the Chorus with a Radio Shack "M" female jack so that the Boss A/C Adapter will plug into it.

I'm not certain if the difference in VDC and/or mA would cause a problem, and if it would, how would I compensate for it?

The Boss A/C Adapter is rated at 9V DC 500mA

The Electro Harmonix A/C Adapter is rated at 9.6V DC 200mA

I popped the hood of the Chorus and there is a resistor connecting from one of the terminals of the power jack lug (ground) directly to the circuit board. Do I need to change the value of the resistor in order to use the Boss A/C Adapter?

If it'll help, here's a link to the schematic:


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Old 10th May 2006, 07:17 PM   #2
Eva is offline Eva  Spain
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That circuit is likely to work fine on anything between 7V and 15V.
I use to feel like the small child in The Emperor's New Clothes tale
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Old 11th May 2006, 01:16 AM   #3
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Thanks Eva.

I need a little help. I wired the coaxial power jack up but didn't get power. This is my first time using a coaxial jack, so I might have the lugs mixed up.

There are 3 lugs - Center Pin, Shell and another that I don't know the name of. Which is which (+, -, ?) ?
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