555 Happy Birthday electronic circuit diagram candle

Posted on Mar 28, 2007

Circuit as shown, consists of four light-controlled electronic switches, timing circuits, voice circuits, and audio circuits and other components. Congratulations for a birthda

555 Happy Birthday electronic circuit diagram candle
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y or celebration, with birthday candles were lit or extinguished song Sonata, birthday atmosphere thick. Optical fiber by the optical switch, photodiodes, IC1 and other components. When the point of birthday candles, the light beam coming from the optical fiber, phototransistor resistor between electrode 3DU3 reduced dozens of kilohms or less, and 555 start-up, J1 pull, J1-1 disengaged, J1-2 is closed, ON the circulation path. By the timing circuit IC2, IC3, R2, RP2, C3, R4, RP3, C5 and other components. Timing td 1.1 (R + RP) C. Adjust RP2, the IC2 delay td1 1.1 (R2 + RP2) C3, about 5 to 6 seconds to J2 pull the trigger IC4, the acoustic output circuit just two English Happy Birthday. IC2 transient stability width over, triggered by the monostable IC3 and R4, RP3, C6 composition, so that IC3 is set, its pulse width of the delay td2 1.1 (R4 + RP3) C6, from about 10 to 15 seconds, so that in the period J3 pull by IC5 playing happy birthday electronic music. J3 release, IC2 trigger again, and so on, until it is extinguished birthday candles, voice and music stopped. IC4 use CIC5607 voice IC, within reservoir Happy Birthday to congratulate language, IC5 use CW9310, within the reservoir, I wish you a Happy Birthday song.

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