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Problem: Output drops out and then builds up again each time volume control is advanced.
Solution: You are running with too much input power. Change circuit for lower gain operation or re-
duce input level.
Problem: Very strong AC hum.
Solution: Input may not be shielded or connected properly. Check all of your connections to make
sure you have shielded wire and connections are grounded.
Problem: Still humming or slight annoying AC hum.
Solution: Try using a battery or regulated power supply. Also make sure your microphone casing is
shielded as well. These noise problems are most evident with high impedance microphones.
Problem: All kinds of pops, siren sounds or something like it (audio with no input)
Solution: Usually this can be cured by shortening input and output wires, and is definitely helped by
using shielded wire on the inputs and outputs. This is caused by self oscillation and is very
easily observed in an amplifier with this much gain. All that is happening is some of the out-
put is being picked up by the input and re-amplified over and over again in a continuous
loop.
Problem: Motorboating sound, and it isn’t the weekend yet!