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Star Trek Doorbell

2014-11-29 11:37  
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Star Trek Doorbell
In the Star Trek ?Next Generation? TV series, the doorbell outside the private quarters of a crew member makes a particular ?beep-boop? sound. The 3v battery powered circuit below tries to simulate this sound. The circuit uses one 74HCT74 dual D flip/flop IC, wired as two one-shot circuits. Both are designed to produce a pulse about one half second long. The first pulse turns on a 555 timer to form the beep sound. Source: discovercircuits