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This is a circuit for a knock alarm that uses a piezoelectric plate to detects vibration due to knocking and activates an alarm for about ten seconds.
Recently musical doorbells have become very common. Musical and continuous power doorbells serve as an attempt to bridge the gap between newer digital circuitry and older doorbell wiring schemes. A major difference between the standard setup of a wired...
A timer is a specialised type of clock for measuring time intervals. Here we present a simple musical alarm timer that can be used for that purpose. This low cost musical alarm timer can be used for introducing a...
In this video, the author is going to show a system where he is able to transfer music from one end to another end using a laser light. He has done this DIY with the maximum distance of 422...