SOLVED Thumb Sucker Is Unresponsive

[MikeL]

Maybe I'm in over my head here. I built a Thumb Sucker for my son, even though I know nothing about guitars, music or oscillating electrons... I plug it in, cycle the Big Button and no LED blinky. I have no guitar or amp to plug in so, not sure if there is any effect. Looking through previous problems, I see the LED polarity issue and I have checked that the status LED flat spot lines up with the square pad marked "k", as do the two snubber LEDs. What am I missing? Wire colors are: white is IN, black is OUT, green is -GND, red is +, blue is SW. Thanks to all who look at my silly problem and unending gratitude for a solution!

 

[Robert]

Are you using a center negative 9V power supply?

 

[MikeL]

Looks like not. The marking on the wall wart shows negative shell with positive center post. Is there a "standard" I missed along the way? Do I need to find a center-negative one?

 

[Robert]

Pedals typically use center negative 9V power supplies, which is opposite to how DC power supplies intended for almost all other electronics are wired.

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You can reverse the red/green wires coming from the Power I/O module temporarily to test it with the supply you have, but you'll probably want it wired correctly when you give it to your son.

 

[MikeL]

Yep, that was it! I took it to my local music store and they plugged it in (their P.S.) and it works just fine. This means I'm guilty of a First-Time-Right build!!! I also bought one of their wall warts for my son. Thanks!!