Do you your wires as short as possible? Also a shielded input wire might prevent squealing. You could also increase the values of the two 100pF caps. It usually helps but don't go to high since it can alter the overall sound of the circuit.
thank you fuzzhead for the layout.. i've replaced the 22k from pin 3 to ground with a 15k ( from 4.5v to 3.8v on pin 3 ) and the squealing stopped i don't know why since it's a voltage devider but anyways it got rid of that squealing. thank you.
I went through this layout again and according to this schematic (https://www.pedalpcb.com/docs/AngryCharles.pdf ) 1- the 1K resistor on pin 3 of the LM833 to vref should be 1M 2-the 1K resistor on pin 6 of the LM833 ( onnected to 100nf than to drive 3) should be 10K. I made those changes and the pedal sounds awsome. keep up the good work
Eagle eye! Ok it seems that I by mistake deleted the old layout when I did an attempt to do a smaller one which includes your observations and it is also verified. No issues with oscillations with your build? I had to lower the vref resistor to ground to 12k to tame it a bit.
I restored the old 22k resitors (voltage divider ). keep the same layout and the only change i made is 1m and 10k resistors. no oscillations whatsoever. pretty close to the videos on youtube.
hello i've done this and works great but i have a high pitch squealing when all pots are maxed.
ReplyDeleteDo you your wires as short as possible? Also a shielded input wire might prevent squealing. You could also increase the values of the two 100pF caps. It usually helps but don't go to high since it can alter the overall sound of the circuit.
Deletethank you fuzzhead for the layout.. i've replaced the 22k from pin 3 to ground with a 15k ( from 4.5v to 3.8v on pin 3 ) and the squealing stopped i don't know why since it's a voltage devider but anyways it got rid of that squealing.
ReplyDeletethank you.
Great! Glad you got it working! :-)
DeleteI went through this layout again and according to this schematic (https://www.pedalpcb.com/docs/AngryCharles.pdf )
ReplyDelete1- the 1K resistor on pin 3 of the LM833 to vref should be 1M
2-the 1K resistor on pin 6 of the LM833 ( onnected to 100nf than to drive 3) should be 10K.
I made those changes and the pedal sounds awsome.
keep up the good work
Eagle eye! Ok it seems that I by mistake deleted the old layout when I did an attempt to do a smaller one which includes your observations and it is also verified.
DeleteNo issues with oscillations with your build? I had to lower the vref resistor to ground to 12k to tame it a bit.
Sounds aweseome indeed!
I restored the old 22k resitors (voltage divider ). keep the same layout and the only change i made is 1m and 10k resistors. no oscillations whatsoever. pretty close to the videos on youtube.
ReplyDelete