Resistor change


Posted on Feb 5, 2014

Resistor change in ECM Mic Preamplifier schematic diagram. The electret condenser microphone (ECM) contains a very sensitive microphone element and an internal FET preamp, a power supply in the range 2 to 10 volts DC is therefore necessary. Suitable ECM`s may be obtained from Maplin Electronics. Although the schematic is drawn showing a three term


Resistor change
Click here to download the full size of the above Circuit.

inal ECM, two terminal ECM`s may be used, the following page in the practical section shows the changes.




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