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Cotton switch

Electronics
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The popularity of LEDs and various toys turning on and off on cotton is growing. We collect something similar, but instead of a lamp, a 3 Volt LED will be used.

Scheme:

If instead of the LED HL1 you put a relay coil, even the incandescent bulbs will light up, with the circuit adding a diode VD1, to protect the VT3 transistor from the self-induction EMF in the relay coil, when it is turned off. With a LED circuit, a diode is not needed.

Bread board:

Details of the circuit are:
KT315G two pieces. Or any other letter.

Also transistor 3107B

Cotton switch

And of course, the most important part of the circuit is the microphone

Attention! We use electret microphones.

The microphone output, with a call to the body, is to the minus power, and the other, respectively, to the plus.

Switch operation video:
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+3
Reply To quote A complaint
put it in the theater ... as an indicator of a full house ... instead of an LED - the recording starts ... "Bravo" ... although due to frequent applause it may be ... "B ... Br ... Bra" .. or so that with applause ... the stun gun in the chairs is turned on ... so the theater fans will be accustomed to standing up to applaud ...

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