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Electronic circuits that use the 555 Timer

555 Timer Circuits

555 Timers are fun and a great way to start learning electronics

SIREN 100dB Circuit


This is a very loud siren and if two or more piezo's are located in a room, the burglar does not know where the sound is coming from.

A robber will not stay anywhere with an ear-piercing sound as he cannot hear if someone is approaching. It's the best deterrent you can get. The "F" contact on the piezo is "feedback" and is not needed in this circuit.



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