Sredna said:There are several PCBs around and one of them is faulty, its marked with the code 04/18
(not to confuse with 04/20 witch is correct)
Do you mean between out and -in? That would basically add to your feedback cap. I think people were doing that before the "double diode" thing was "discovered." Once I stuck 2 diodes in series in mine (ages ago), all oscillation went away.Sredna said:To get the 1731 to work better with a API312 type circuit you can add a 100-120pF
cap between out and in.
Sredna said:Does your PCBs got component designations (R1, D2, Q3) or values(360R, 4148)
or just silhouettes on them?
Sredna said:Important: dont forget the double diode (D2)!
Sredna said:And C2 goes to -IN (from base of Q8)
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