"I added a capacitor". Series or parallel? Value of 10pF or 100uF?
Why do you want to cut high frequencies when hum is a very low frequency? Feedback squealing is a different problem.
Again:
1) Does the amplifier produce hum when there is nothing connected to its input?
2) Is there hum when only the shielded cable is connected to the amplifier's input?
Mic cables have plugs and amplifier inputs have jacks.
I do not know why yours are backwards.
The RC lowpass filter is very simple so its affect is gradual. 950Hz is reduced -3dB which is just a little less loud. 1900Hz is -6dB which is reduced a little more. 9500Hz has much lower loudness but is still heard.
There is your hum problem. The wires inside a telephone handset that feed its earphone are not shielded!
The jack and pot should be in the other end of the handset with very short wires so they are very close to the earphone that is used as the mic.
That also explains why there is a jack and not a plug.
Sorry! there is a mistake in the perspective of the picture. Yes, I had everything wired correctly.Look here:
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Moderator; there is another thread about this problem in Elementary Circuit Questions. Please merge them together if possible.
Hi Klaus! its a wrong perspective of the picture! here are the two wirings the I've tested so far and its problems:Hi,
your wiring in post#33 is different to the schematic in post#28.
The capacitor is at the wrong side of the resistor.
The capacitor needs to be at the plug side of the resistor not at the mic side of the resistor.
Klaus
Sorry, that is the back of the pot.Hi,
It's not clear how you connected the pot.
Please post a photo.
Klaus
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