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Infrared reflectance electronic doorbell

2014-11-01 23:37  
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Infrared reflectance electronic doorbell
The infrared reflectance electronic doorbell consists of infrared transmitter circuit, infrared receiver circuit, low-frequency oscillator, audio oscillator and audio output circuit, and it is shown in Figure 3-121. Infrared transmitter circuit consists of the infrared transmitter tube (infrared light-emitting diode) VLl, driver transistor Vl, the pin 6 internal cirucuit of integrated circuit ICl and the external components. Infrared receiver circuit consists of infrared / receiver tube (infrared phototransistor) V2 and pin 3 internal circuit of IC1. Low-frequency oscillator consists of the NOR gates Dl and D2 of four NOR gate digital IC ICZ (CD4001) and the resistor R5, capacitor C4 and so on.