Whammy WH-1 / generic AC power question

Started by yodude, September 01, 2010, 11:56:16 AM

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yodude

I recently picked up a WH-1 with a missing power jack.  Not having the replacement part, my plan is to solder in a short length of wire with an in-line jack.  The WH-1 takes AC power and I need a little help figuring which way to hook it up.

The WH-1 board has two tabs where the jack used to be.  Using the DMM continuity tester, I determined that one of the tabs is connected to the ground plane.  The adapter (new from digitech) doesn't say anything similar to the "center negative" that you see on DC adapters.  So should I send adapter center to ground?  sleeve?  Does it matter?

Thanks.

JKowalski

If the pedal has a full wave rectifier, then the AC power can be switched between positive or negative with no consequences. The rectifier regulates where the ground and positive voltages go.

But since one side is grounded, that kind of tells me that it is not a full wave rectifier, probably half wave. In that case.... It still doesn't matter. The diode will still pass only positive to where the positive voltage should appear across.

Transformer coupled AC has no "polarity" because the polarity switches every cycle (alternating current, ya know)

yodude

Thanks man.  Anyone else care to chime in before surgery begins?

yodude

I ended up hooking the power supply up with no regard to +/- and it worked.

Just wanted to close the loop on this in case somebody has the same problem one day ...