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Flashing electronic doorbell

2017-02-02 22:24  
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Flashing electronic doorbell
The flashing electronic doorbell circuit is composed of the power supply circuit, audio input trigger circuit, multivibrator, and it is shown in Figure 3-124. The power supply circuit consists of the step-down capacitor C6, resistor RlO, rectifier diode VD3, regulator C5. Audio input trigger circuit s composed of the audio sensor trigger circuit B, transistors Vl, V2, diode VDlR4 and capacitors Cl, C2. Multivibrator is composed of the time-base integrated circuit IC, resistors R5, R6 and capacitors C3, C4. Flash circuit consists of resistors R7-R9, rectifier diode VD4, capacitors C7, C8, thyristor VT and flash components.