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Digital lock 6

2017-01-06 10:27  
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Digital lock 6
The digital lock circuit is composed of the power switch SO, power transformer T, bridge rectifier UR, relays Kl, K2, password buttons Sl-Sl2, transistors VT, LED VLl, VL2, diodes VD1-VD4, resistors R1 -R3 and capacitors Cl-C6, and it is shown in Figure 3-103. Rl-R3 use the 1/4W carbon film resistors or metal film resistors. Cl-C4 select ultra small aluminum electrolytic capacitors with the voltage in 16V; C5 uses the monolithic capacitor. VD1-VD4 are choose 1N4148 silicon switch diode; VD5 uses the lN4007 silicon rectifier diode.