ST Modular Give II
Troubleshooting the Give II
UPDATE: Found the issue!
I was looking over the BOM and my Mouser order and found that I had a substitution for T1 (MMBFJ309) and what I got had the source and drain pins swapped. I also swapped out IC1 with a new TL072 and the VCO fired right up.
My voltages are a mess! No parts were subbituted and I removed the LED and trimmer. I checked the orientation on all of my ICs and electro-caps.
IC1 (TL072)
- -6.3v
- -6.3v
- 0
- -11.3v
- 0
- 2.3v
- -10v
- 11.3v
IC2 (TL072)
- 4.4v
- 0
- 0
- -11.3v
- 2.9v
- 5v
- -9.3v
- 11.3v
IC3 (TL072)
- 9.5v
- 0
- 9.5v
- -11.3v
- 9.7v
- 9.5v
- -9.2v
- 11.3v
IC4 (TL074)
- -3.5v
- -0.7v
- 0
- 11.3v
- 0
- 0
- -7.1v
- 4.8v
- 0
- 0
- -11.3v
- 0
- 0
- 0
IC5 (TL074)
- 0
- 0
- 0
- 11.3v
- 0
- 0
- 0
- 0
- 0
- 0
- -11.3v
- 0
- 0
- 0
U1 (CD4024BM)
- 0
- 0
- 0
- 11.3v
- 11.3v
- 11.3v
- 0
- 0
- 11.3v
- 0
- 0
- 11.3v
- 0
- 11.3
