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Topics - andronikus7

#1
Tech Help - Projects Page / Loophole Issue
April 12, 2013, 06:16:11 PM
Hi everyone,

the Loophole is the first Mad Bean project that I have tried to build. But I have already made a few other easy effect pedals from strip board before. Unfortunately my Loophole does not function as it is supposed to. My issue is very similar to the one described by bigrigg here:
http://www.madbeanpedals.com/forum/index.php?topic=4428
Green LED is always on and cannot be switched off. No recording is possible.
But I have checked the diodes D1 and D2 already aswell as REG1. Those do not seem to cause the issue. After double checking the wiring and the soldering points I am now running out of ideas. So, I will post pictures of my PCB and my measuring values (in Volts) below. It would be very cool, if you guys could help me out.

IC1
1: 4,2
2: 4,2
3: 4,2
4: 0
5: 3,9
6: 4,2
7: 4,2
8: 8,3

IC2
1: 4,1
2: 4,1
3: 4,1
4: 0
5: 3,9
6: 4,1
7: 4,1
8: 8,3

IC3
1: 0
2: 0
3: 0
4: 4,9
5: 0
6: 0
7: 0
8: 0
9: 4,9
10: 4,9
11: 0
12: 0
13: 0
14: 0
15: 0
16: 5,0
17: 0
18: 0
19: 0
20: 0
21: 0
22: 0
23: 0,6
24: 0,1
25: 5,0
26: 0
27: 4,9
28: 5,0

IC4
1: 4,9
2: 5,0
3: 0
4: 5,0
5: 0
6: 0
7: 0
8: 0,1
9: 0,1
10: 4,0
11: 0
12: 4,9
13: 4,9
14: 5,0

REG1
In: 8,1
Ground: 0
Out: 5,0





Thanks in advance,
Nils (from Germany)