SOLVED Dark Rift Feedback creates static

dstahl

New member
I just finished my Dark Rift delay. Somehow any turning of the feedback knob beyond 0 causes a ton of hiss/static.
I noticed other parts of circuit work (modulation, delay, etc) but are also a bit noisier than I think they should be.
here is a clip of what it is doing.
any thoughts of where to start looking?


IMG_1222.JPG IMG_1223 2.JPG
 

dstahl

New member
I just built one, and I don't think that modulation sounds right either. Have you swapped the 2399?
yes. I swapped it with 2 others. and I also tried the green led thing soldered to legs 3 and 7 of the pt2399. didn't help much

I got these for voltages across the IC's

IC 1
  1. 4.8
  2. 4.5
  3. 4.2
  4. 0
  5. 9.2
  6. 4.5
  7. 4.5
  8. 4.5
IC2
  1. 4.9
  2. 2.5
  3. 0
  4. 0
  5. 2.8
  6. 2.5
  7. .9
  8. .9
  9. 2.5
  10. 2.5
  11. 4.9
  12. 1-1.3V varying
  13. 2.5
  14. 2.5
  15. 2.5
  16. 2.5

IC3
  1. 2.5
  2. 2.5
  3. 25.
  4. 0
  5. 9.1
  6. 2.5
  7. 2.5
  8. 2.5
IC5
  1. 3-6V fluctuating
  2. 4.4
  3. 4.4
  4. 9.1
  5. 3-6V fluctuating
  6. 4.3
  7. 0
  8. 3-6V fluctuating
  9. 4.4
  10. 4.4
  11. varying MV
  12. varying V
  13. varying V
  14. varying V
 

dstahl

New member
ok. I reflowed every single solder joint. which also meant bending the pots. I have clean repeats now. Although they are kind of limited and only do like 4 repeats at max, and won't go into self-oscillation.
 
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