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Digital lock 3

2017-01-07 19:23  
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Digital lock 3
The digital lock circuit consists of the optical switch circuit, trigger, sound and alarm circuit and solenoid drive circuit, and it is shown in Figure 3-100. Photoelectric switch circuit consists of the light-emitting diodes VLl-VL8, phototransistors Vl-V8 and resistors Rl-R16. Trigger circuit consists of the Dl-D4 which are inside of six NOT gate integrated circuit ICl (Dl-D6) and eight-input NAND gate IC lC2. Sound and alarm circuit is composed of the integrated circuit IC3, transistors V9, VlO, voltage regulator diode VS, speaker BL and resistors R17, Rl8.