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Magical music box using CMOS and 555 [Project]
posted October 29 2013 15:07.44 by spic0m




The Magical Music Box was created for maker's son Reuben. It used a discarded wind-up music movement that plays Brahms Lullaby. The movement was mounted into a clear plastic electrical junction box with extended winder to the outside world using part of the original case and winder.

There is a magnet mounted to the winder shaft that triggers a reed switch which powers the circuit initially and the 3minute monostable 555 oscillator pulls in a relay to power the remaining circuit and starts the timing down the 3 minutes.



[Link: Justin Giles-Clark]
 
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