I made this preamp circuit for the project i am doing. I am not sure about whether its working or not...Can anyone plz guide me in testing whether its working or not? How to test the preamp circuit?
My source of ciruit is this... **broken link removed**
Set the Voltmeter on a DC range that is just above the supply voltage.
Measure the DC voltage at the emitter of Q2.
Is it about half of the supply voltage?
Measure the voltage at the emitter of Q1.
Record it.
Measure the voltage at the base of Q1?
Is it about 0.6 volts higher?
Now change the voltmeter setting to the lowest AC range.
Connect it to the "Output". Tap or make a loud sound into the mic.
Does this effect the voltmeter?
One thing I would change in the circuit.
If you are using a two contact ECM change the 1k resistor that powers the mic to 10k.