Hi!
I just built a Mini Mu and I'm having some difficulty figuring out where I went wrong. The pedal powers up and switches on/off correctly, but when it's on, no sound comes through (I do notice some scratching noise when I turn the Level pot, but no actual guitar signal). Here are the voltages, and I've attached some pictures.
IC1 OPA134
1 8.2 (should be -8.4)
2 -0.3 (should be 0)
3 0 (should be 0)
4 -8.2 (should be -8.4)
5 0 (should be -8.4)
6 7.5 (should be 0)
7 8.5 (should be 8.8)
8 8.2 (ignore)
IC2 LM358
1 -0.97 (should be 7.57)
2 4.2 (should be 2.24)
3 4.2 (should be 4.35)
4 -8.2 (should be -8.44)
5 0 (should be 0.027)
6 - 0.95 (should be 0.03)
7 7.2 (should be 0.36)
8 8.5 (should be 8.8)
IC3 TLE2074
1 -6.5 (should be 0)
2 -6.5 (should be 0)
3 0 (should be 0)
4 -7 (should be 8.77)
5 0 (should be 0)
6 -6.3 (should be 0)
7 -6.5 (should be 0)
8 -6.3 (should be 0)
9 -6.5 (should be 0)
10 0 (should be 0)
11 -8.2 (should be -8.4)
12 -6.5 (should be 0)
13 -6.5 (should be 0)
14 -6.5 (should be 0)
Any help is greatly appreciated!
I just built a Mini Mu and I'm having some difficulty figuring out where I went wrong. The pedal powers up and switches on/off correctly, but when it's on, no sound comes through (I do notice some scratching noise when I turn the Level pot, but no actual guitar signal). Here are the voltages, and I've attached some pictures.
IC1 OPA134
1 8.2 (should be -8.4)
2 -0.3 (should be 0)
3 0 (should be 0)
4 -8.2 (should be -8.4)
5 0 (should be -8.4)
6 7.5 (should be 0)
7 8.5 (should be 8.8)
8 8.2 (ignore)
IC2 LM358
1 -0.97 (should be 7.57)
2 4.2 (should be 2.24)
3 4.2 (should be 4.35)
4 -8.2 (should be -8.44)
5 0 (should be 0.027)
6 - 0.95 (should be 0.03)
7 7.2 (should be 0.36)
8 8.5 (should be 8.8)
IC3 TLE2074
1 -6.5 (should be 0)
2 -6.5 (should be 0)
3 0 (should be 0)
4 -7 (should be 8.77)
5 0 (should be 0)
6 -6.3 (should be 0)
7 -6.5 (should be 0)
8 -6.3 (should be 0)
9 -6.5 (should be 0)
10 0 (should be 0)
11 -8.2 (should be -8.4)
12 -6.5 (should be 0)
13 -6.5 (should be 0)
14 -6.5 (should be 0)
Any help is greatly appreciated!