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Sound Light Switch

This box is a 40Khz ultra-sound detector, with a latch and an output relay,
when you clap your hands, the relay turn the light on, when you clap again the light goes off.
The 3 holes was LEDs, showing ON or OFF state, and ultra-sound level,
The 3 LED is floting arround inside the box, I did not glue them enough :-)
A potentiometer is used to adjust the sensitivity.
Constructed when I was in school 7th grade. I used it for meny years