18v power problem

[scott1568]

I just got an 18v wall supply today. The case says Output: 18VAC  500Ma.

I have 3 pedals that each should handle this:
GGG Marshall Bluesbreaker, GGG BSIAB, and BYOC 5 knob compressor. The problem is, this power supply is giving a distinct buzzing noise through the pedal, either on the pedal board, or if the effect is taken off the board and used alone.

I can't understand this problem. Could I have a bad unit? Each pedal works fina at normal voltage BTW.

thanks

[.Mike]

The case says Output: 18VAC  500Ma.

Are you sure it says AC because, ...ermm... you want DC.

Mike

[R.G.]

One of the quickest ways to kill a pedal is to hook up an AC power adapter to it. Even with a reverse protection diode, this often first kills the protection diode, then the rest of the circuit.

Alternating Current (AC) and Direct Current (DC) are different. Don't confuse them. Burning parts and PCB smell really, really bad.

[scott1568]

Well DANG!!!  

I am lucky. I really don't want to rebuild those pedals. Thanks guys. I feel relieved and yet   somehow  a little bit stupid.


Mike- are you in Savannah??? Are you the "other" pedal builder everyone asks me about? Feel free to PM.

[.Mike]

Mike- are you in Savannah??? Are you the "other" pedal builder everyone asks me about? Feel free to PM.

In Savannah, yes. Other pedal builder, probably not-- I do this for fun, and have only built pedals for myself. PM'd.

Mike

[stringsthings]

... Burning parts and PCB smell really, really bad ....

i often serve burnt PCB on toast to the local wildlife .... after i scrape off the flux, they get some "iron" in their diet !