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Digital lock 9

2014-11-03 17:14  
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Digital lock 9
The digital lock circuit is composed of the light control coding circuit, logic control circuit, control implementation circuit and alarm, and it is shown in Figure 3-106. Light control coding circuit consists of the infrared light emitting diodes VLl-VM, infrared receiver photodiodes VDl-VD4 and resistors Rl-R8. Logic control circuit consists of NAND gate integrated circuit ICl (Dl. D4) and the OR gate integrated circuit IC2 (D5-D7). Control implementation circuit is composed of the transistor V, resistor R9, diode VD5 and relay K. Voice alarm circuit is composed of the integrated circuit IC3, audio power amplifier integrated circuit IC4, voltage regulator diode VS, resistors RlO-R14, capacitors Cl-C6 and the speaker BL.