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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, November 29, 2011 08:14 PM
Hobby Circuits'
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More
Switch Circuits,
Microphone Circuits |
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POP FREE MICROPHONE ON/OFF
SWITCH CIRCUIT |
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. |
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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 Drawing Below to view PDF version of Schematic |
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eMail David A.
Johnson, P.E. about this circuit |
