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S1..S8 - NOPB (Normally Open Push-Button)
Ty1..Ty4 - Thyristor 1A/0.2mA/50V
R1..R3 - 220R/1W
R4 - 270R/1W
R5 - 27R/1W
RL - Relay 12V
T1 - PNP 1A/20V
Vcc - 12..18V
The circuit can be powered with a source of 12-18V. Its function is to restrict access to something from people which don't know the secret code (On the scheme the code is S4, S3, S2, S1). When the correct code is entered, the circuit turns on the relay. To reset the circuit you have to press any of the keys S5..S8. |
