Sound detector latch
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Sound detector latch circuit


U1 NE555 timer IC
R1 1k resistor
R2 50k potentiometer
C1 0.1uF ceramic capacitor
C2 10uf tantalum capacitor

All resistors are 5 or 10 percent tolerance, 1/4-watt all capacitors are 10 percent tolerance, rated 35 volts or higher.

When the 555 ic goes into timing mode (triggered by an output signal from the sound detector amplifier,) the timer's output (pin 3) is set into HIGH for a duration set by C2, and R2. adjusting R1 will adjust how long it listens, from 10 seconds all the way down to 2/10ths of a second. this could be used to listen for hand claps.

Title: Sound detector latch
electronic circuit
Source: unknown
Published on: 2012-09-20
Reads: 78
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