Here’s a design circuit for electret condenser microphone amplifier. using a LM1458 dual op amp Operational Amplifier IC. electret condenser microphone by bias circuit and preamp. The circuit takes the audio signal rom the condenser microphone and amplifier it, so you can use the microphone as the input to some device which wouldn’t normally accept microphone level signals (which are very low). This is the figure of the circuit;
This amplifier has an adjustable gain, which is performed via. R1 (a 1 Mega Ohm variable resistor). It controls the feedback of the LM1458 dual opamp, which in turn drive a LM1458 output IC.
Electronic Parts List:
Q1,Q2 – LM1458 transistor
R1,R2,R3 – 4.7k ohm resistor
R4, R5 – 10k ohm resistor
R6,R7 – 47k ohm resistor
C1, – 0.22uF ceramic capacitor
C2, – 1uF ceramic capacitor
Q1,Q2 – LM1458 transistor
R1,R2,R3 – 4.7k ohm resistor
R4, R5 – 10k ohm resistor
R6,R7 – 47k ohm resistor
C1, – 0.22uF ceramic capacitor
C2, – 1uF ceramic capacitor
MIC1 – electret condenser microphone
All resistors are 5 or 10 percent tolerance, 1/4-watt. All capacitors are 10 percent tolerance, rated 35 volts or higher.
All resistors are 5 or 10 percent tolerance, 1/4-watt. All capacitors are 10 percent tolerance, rated 35 volts or higher.
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