My first WHAMMY included the following:
WAMMY board and parts from diyAudio ($209.05)
Chassis from eBay ($73.70)
Can of Metalic Black spray paint ($7)
Misc screws and stuff ($5)
Replacement Dremel cutting bit ($7)
Neutrik NMJ6HF-S 1/4 Inch Stereo Jack Switched ($1.02)
Neutrik NC4FD-L-B-1 D-Series 4-Pin XLR FemaleĀ ($6.05)
Total: $308.82
I got this LED to indicate power. I got the 110v blue version. A whole $1.86!
I connected it to positive (left) of R10 and negative (right) side of R14.
When I drilled the holes, I wasn't able to use a drill press, and I rushed it a little with the hand drill, so the LED and the 1/4" jack are perfectly lined up. Leason learned; go slower. In any event, it cam our OK, and no there is a power indicator.
Also, I grounded the pot, which helped to reduce noise when touching the volume knob.