This post shows how to build Jaycar’s JIMINI THE CRICKET DIY KIT- PROJECT SC2 #14. It takes around half an hour to build this kit. It is basically a sound sensor.
When there is a noise/sound close to the electret microphone, the circuit turns on the two LEDs and produces a chirping sound.
This video teaches you how to build a simple clap switch circuit on a breadboard using an NE555 timer.
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