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4-Digit Keypad Controlled Switch Circuit Diagram

2014-12-07 12:39  
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a 4 digit keypad controlled switch med 300x223 4 Digit Keypad Controlled Switch Circuit Diagram

Description: This is a 4-Digit Keypad Controlled Switch. This is a simple circuit. Note: Do not use the “on-board” relay to switch mains voltage. The Keypad must be the kind with a common terminal and a separate connection for each key. Any keys not wired to “A B C D & E” are connected to the base of Q3 by R7. Component: Capacitor, Resistor, Transistor, LED, Relay.[circuit-finder.com]

Tags: Capacitor, circuit diagram, control circuit, control diagram, control schematic, electronic circuit, electronic control, LED, Relay, Resistor, schematic diagram, Transistor

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