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Topics - rhaas

#1
VFE Projects / Mini Mu Help
June 03, 2023, 06:49:03 PM
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!