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I just realized you specified the decoupling capacitor going to chassis. If this circuit is in a plastic enclosure do I still need C4?
See the 4th contact on the headset plug?
The circuit converts the headset electret microphone into an input for the guitar pickup. The Jfet is powered instead of the Jfet in an electret mic.
Many headsets for phones have an electret microphone. The first sketch shows a 4-contacts plug with the 4th contact connected to the guitar circuit and it is labelled "mic".I would really like to have some clarification on post #8, I would hate to see black smoke coming out of my iPhone.
Ok understood,
So I can connect R3 back to ground and remove C4 and 9V supply as it is in the original schematic?
Do I maintain R1 as 2.2M or 39K was good?
I have tried my circuit and I am getting some distortion. I have tried connecting to headphones and to the line input of a sound system both with the same effect.
C1 is supposed to be 20nF (20,000pF), not 20pF. 223 is 22,000pF so it is almost perfect.I bought the components from a surplus store and used the closest values they had. Could that be the cause?
C1 = 20pF, the one I have is labeled 223.
You should learn about how capacitors are marked. The third number is how many zeros are following the first two numbers and the total is how many pF. 223 is 22 followed by 3 zeros so it is 22,000pF which is 22nF.C2 = 100pF, the one I have is labeled 101
C3 = 470pF, the one I have is labeled 560k.C3 reduces radio pickup and does not affect the audio from the circuit.
560k is 56 followed by 1 zero so it is 560pF which is almost the same as the 470pF shown. "k" means a tolerance of 10% ("j" is 5% and "m" is 20%).
You should learn about how capacitors are marked. The third number is how many zeros are following the first two numbers and the total is how many pF. 223 is 22 followed by 3 zeros so it is 22,000pF which is 22nF.
101 is 10 followed by 1 zero so it is perfect at 100pF.