madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: matmosphere on June 17, 2014, 03:13:15 AM

Title: Bypass problems, now with pics and voltage measurements.
Post by: matmosphere on June 17, 2014, 03:13:15 AM
I'm having a strange issue. I wired up a new build and am getting a clean tone when the effect is on and off. It's like the board isn't affecting the signal at all. I know the switch is working because the LED turns on and off. Any thoughts, I've checked over the off board wiring and it seems to be hooked up correctly.
Title: Re: Bypass problems
Post by: jimilee on June 17, 2014, 04:27:02 AM
What effect, got any pictures of the stomp, have you checked the orientation and polarity of your components. Someone will be along shortly with stern instructions on getting tech help, so go ahead and post clear well lit pictures of the stomp and the board, maybe even a schematic.  :P
Title: Re: Bypass problems
Post by: matmosphere on June 17, 2014, 04:51:50 AM
Sorry, I'm pretty new to this thought this might be a common problem. The pedal is a Grind Customs DeProfundis delay using a verified veroboard layout that can be found here, http://tagboardeffects.blogspot.com/2014/04/grind-customs-fx-deprofundis-delay.html

I don't have the greatest soldering skills (don't laugh) but here is a shot of the inside:
Title: Re: Bypass problems
Post by: matmosphere on June 19, 2014, 03:19:39 AM
Here's a picture of the bottom of the board.
Title: Re: Bypass problems
Post by: matmosphere on June 19, 2014, 03:20:10 AM
And here's the top.
Title: Re: Bypass problems
Post by: matmosphere on June 19, 2014, 03:50:29 AM
Here are some voltage measurements

Pt 2399

1) 4.9       16) 2.47
2) 2.94     15) 4.94
3) .6         14) 4.89
4) .6         13) 3.16
5) 2.97     12) 4.1
6) 2.4       11) 2.47
7) 4.55     10) 2.47
8) 4.54      9)  104.6 (which can't be right)


Tl072
1) 4.73
2) 4.73
3) 4.73
4) .5
5) 4.73
6) 4.73
7) 4.73
8) 9.45

78L05
I) 9.45
G) .5
O) 4.94