I wish you a happy birthday electronic candle circuit principle

0805RGB flashing

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Specializing in the production of LED chip LED LED lamp beads

As shown in the figure, the whole circuit consists of four parts: light-controlled electronic switch, timing circuit, voice circuit and audio circuit. It is used to congratulate birthdays or celebrations, with the sounding or blowing out of birthday candles, and the birthday is strong.
The light control switch is composed of an optical fiber, a photosensitive tube, an ICl, and the like. When the birthday candle is lit, the light beam transmitted from the optical fiber reduces the interelectrode resistance of the phototransistor 3DU3 to less than several tens of kΩ, 555 starts to vibrate, Jl pulls in, Jl-1 is disengaged, J1-2 is closed, and Through the circulation path. The timing circuit is composed of IC2, IC3, R2, RP2, C3, R4, R3a, C6 and the like. Timing time td=1.1(R+RP)C. Adjust RP2 so that IC2 delay td1=1.1(R2+RPz)C3, about 5~6 seconds, make J2 pull, trigger IC4, make the audio circuit just output Two sentences of English "HappyBirthday".