OK, I have built a couple of General Guitar Gadget kits and they have turned out well. Currently putting together a Triangle Big Muff Pi kit from GGG. Everything is per the kit and this schematic: http://generalguitargadgets.com/pdf/ggg_bmp_tri_sc.pdf?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a
and this wiring diagram: http://generalguitargadgets.com/pdf/ggg_bmp_wiring.pdf?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a
When I was done I connected a 9v battery and connected it to a small amp. There is no signal passed in bypass or when turned on. The LED does light.
I have checked my wiring and solder joints. I have done continuity checks across the whole board and footswitch and it seems connected. I have done grounding checks to every grounding point and it seems fine. I have checked continuity from the input jack to the output jack and that is good. Today I plugged in live amp to the output jack and tapped on the tip lug of the output jack. There was no sound.
It seems like I am missing something very obvious. Can anyone help? Thanks.
Quote from: markrocknroll on January 03, 2014, 06:28:29 PM
There is no signal passed in bypass or when turned on.
Your wiring diagram shows true bypass, so if no bypass signal, you've definitely made a wiring error either with the in/out jacks, or the stomp switch. Check the orientation of the switch, the lugs of the jacks, and post a picture for us to look at if you can't figure it out.
I've checked and rechecked everything. Maybe I've been looking at it too much. Here are 3 pics:
(https://www.dropbox.com/s/iwuqaoby2yi7ppm/bmp_switch.jpg)
(https://www.dropbox.com/s/ipdgi8iiryslgri/bmp_jacks.jpg)
(https://www.dropbox.com/s/rctuh6gb395dmv2/bmp.jpg)
Links to pics:
https://www.dropbox.com/s/iwuqaoby2yi7ppm/bmp_switch.jpg (https://www.dropbox.com/s/iwuqaoby2yi7ppm/bmp_switch.jpg)
https://www.dropbox.com/s/ipdgi8iiryslgri/bmp_jacks.jpg (https://www.dropbox.com/s/ipdgi8iiryslgri/bmp_jacks.jpg)
https://www.dropbox.com/s/rctuh6gb395dmv2/bmp.jpg (https://www.dropbox.com/s/rctuh6gb395dmv2/bmp.jpg)
thanks
The tip springs on the jacks look very close to the back of the pots. Stick a plug in there, and then measure from tip to ground. Might be shorting. Rotate jacks as needed.
Up and running. Per your advice, I checked if it was shorting on the pot. It wasn't but I found the jack was shorting on the side of the box. It sounds fantastic! Very happy. Thanks for the help.