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Electronic password switch 2

2014-11-13 12:09  
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Electronic password switch 2
The electronic password switch circuit is composed of the password control circuit and control implementation circuit, and it is shown in Figure 3-97. Password control circuit consists of password control buttons Sl-Sl2, diodes VDl-VD4, resistors Rl-R5, capacitors C1-C5 and four NAND gate IC lC . Control implementation circuit consists of the relay K, diode VD5, transistor V, and resistors R6, R7. Rl-R7 use the 1/4W carbon film resistors or metal film resistors. Cl-C5 select the aluminum electrolytic capacitors with voltage in 16V . VDl-VD4 use 1N4148 silicon switch diodes; VD5 uses the 1N4 1907 silicon rectifier diode.