Universal microphone amplifier based on NE5532
Designed by Hobby Home Electronics in Latvia
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Description: The universal microphone amplifier can work with two or three output electret microphones. Good sound quality is achieved through the use of radio components such as tantalum capacitors …
Read More…Description:
The universal microphone amplifier can work with two or three output electret microphones. Good sound quality is achieved through the use of radio components such as tantalum capacitors and the low noise operational amplifier microcircuit NE5532.
The circuit contains two stages with controlled gain. The gain of the first stage is continuously adjustable by a potentiometer POT1 in the range of 1 ... 10 times.
The gain of the second stage can be changed in steps using a jumper JUMP1. If the jumper leads are not shorted together, the gain will be greatest, which is determined by the ratio of R8 and R5 resistors. When a jumper is connected to R6 or R7 in parallel with R8, the gain will be less. Thus, the overall gain can be adjusted in the range from 0.9 ... 100.
The technical features:
Contents in the package:
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