Members bdecorsey Posted February 27, 2008 Members Share Posted February 27, 2008 Ok, so I've got a build of the Old Mighty Mouse kit that I've been working on for a while now. When I plug it in, the LED light works, and so does the bypass, but when the pedal is switched on no sound comes from the amp. I've been using the audio probe found here: http://www.diystompboxes.com/wiki/index.php?title=Debugging to try and debug this thing. When I plug my guitar into the box and use the audio probe, I get signal coming form the input jack through the bypass just fine. Its very clear, works great. When I try the same thing with the conductor going to the board, I get nothing. I'm pretty damn sure the solder joint isn't cold, and I just replaced the jack, so its brand new and shouldn't be screwed up. I think the wiring may be wrong? I've got the tip soldered to #4 on the switch for the bypass, I've got the ring soldered to the AC Jack, and I've got the sleeve soldered both to #2 on the switch (black wire) and the board (green wire). Here are some pics, sorry they aren't clearer: Link to comment Share on other sites More sharing options...
Members mrbrown49 Posted February 27, 2008 Members Share Posted February 27, 2008 Are you saying that when the pedal is bypassed you get signal to the amp? Are you sure you are using the probe correctly? I would get in there with a continuity tester and poke around. Link to comment Share on other sites More sharing options...
Members bdecorsey Posted February 27, 2008 Author Members Share Posted February 27, 2008 Yes, when the pedal is in bypass mode (off) I get signal, and I get signal with the audio probe from the conductor on the input jack that bypasses the PCB. When the pedal is switched on I get no signal, and I get no signal with the audio probe from the conductor on the input jack that goes to the PCB. Link to comment Share on other sites More sharing options...
Members el_tonto Posted February 27, 2008 Members Share Posted February 27, 2008 I would think that switching it on causes a short across the input. Hence the audio disappears when it is turned on. Link to comment Share on other sites More sharing options...
Members bluesmang Posted February 28, 2008 Members Share Posted February 28, 2008 I had the same problem before with a build. You're grounding your input somehow when your engaging the circuit. Double check your ground wires to your input jack and to the board. Link to comment Share on other sites More sharing options...
Members mrbrown49 Posted February 28, 2008 Members Share Posted February 28, 2008 I had a similar problem with a boost pedal I built. There was a short to ground, which actually turned out to be a component touching the case after enclosure. Link to comment Share on other sites More sharing options...
Members bdecorsey Posted February 29, 2008 Author Members Share Posted February 29, 2008 So, it turns out the ground wire to the input jack (which I've got going from the 'ring' conductor on the jack) is grounded to the AC input jack. The conductor its grounded to is loose. Could this be causing the short? Link to comment Share on other sites More sharing options...
Members bdecorsey Posted March 1, 2008 Author Members Share Posted March 1, 2008 Bump. Could the loose conductor on the AC jack becausing the problem? Link to comment Share on other sites More sharing options...
Members Saturnine10 Posted March 1, 2008 Members Share Posted March 1, 2008 Test the jack and see if the connectors are getting power like they are supposed too.. Plug in your wall wort and plug it in and test it out! Link to comment Share on other sites More sharing options...
Members bdecorsey Posted March 6, 2008 Author Members Share Posted March 6, 2008 Test the jack and see if the connectors are getting power like they are supposed too.. Plug in your wall wort and plug it in and test it out! Sorry, I'm not sure how to do this. The pedal is getting power (the LED turns on when the pedal is activated) but the wires getting power and hooked up to the conductors that aren't loose. Its really just a ground issue, isn't it? if the conductor is loose, could this short the ground? Link to comment Share on other sites More sharing options...
Members mrbrown49 Posted March 6, 2008 Members Share Posted March 6, 2008 Usually loose is not good, but in this case I'm not really sure what you are talking about. Sounds like a short to ground somewhere though. Link to comment Share on other sites More sharing options...
Members DBDbadreligion Posted March 7, 2008 Members Share Posted March 7, 2008 just 2 days ago I made a EHX LPB1 clone and i had the same problem. It ended up being that the Tip of the input jack was making contact with the enclosure. That caused a short to ground. Link to comment Share on other sites More sharing options...
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