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DiscoverCircuits.com -- Hobby Corner
"Hobby Circuits for
your Hobby Projects"
Last Updated on:
06/19/2009 02:26:56 PM
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Pop Free Microphone Switch Circuit
designed by David Johnson, P.E. |
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This electronic hobby circuit uses a
simple technique to eliminate the usual “pop” sound when an electret type microphone is
switched on or off. The circuit is completely passive and will work on
dynamic and electret type microphones. The circuit shows a typical three wire
microphone connection. On some microphones only two wires are used. With
those two wire circuits, wire the 100uF capacitor shown below to the + side of the
microphone. |
| The circuit works by shunting
the audio portion of the microphone signal to ground, when the switch is closed.
This action does not change the DC level on the microphone output, thus the on and off
switching should not produce the usual “Pop” sound. Sometimes such pops are so
severe, that they can blow out amplifiers or speakers. |
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Click on Schematic below to view PDF
version of this Circuit |
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