Resistor Chip Arrays
Product name: simple code lock DIY welding kit
Product model: TJ-56-145
Working voltage: DC5V
PCB size: 52 * 40mm
Description:
The simple code lock is composed of D trigger CD4013, NAND gate CD4011 and the surrounding resistance, key switch and other components. It needs to press the correct key (input password) in a certain order before the lock can be opened (LED1 is on)
Circuit principle
1. Press S1, Q=1 for U1A, S4, Q=1 for U1B, S7, Q=1 for U2A, S9, Q=1 for U2B, and the lock opening indicator LED1 lights up, indicating that the password is entered correctly. At the same time,/Q=0 for U2B and Y=1 for U3 make the first three triggers clear. If you want to clear U2B, the indicator LED1 goes out (lock closed), you can press S8.
2. According to the above analysis, the password is 1479 in sequence. If you do not follow the sequence or press the other trigger reset end (R end) key in the process of entering the password, the password is incorrect.
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Type : Voltage Regulator
Origin : Mainland China