1)Time Delay Relay Circuit

Introduction & Working:

This Project Is The Timer Circuit Using Transistor&Capacitor.It Working Based By Capacitor Charging.When We On The Circuit,The Capacitor Was Charging And When We Push The Micro Switch or When We Insert A Coin Into The Coin Sensor,The Charged Capacitor Was Discharging And Now The Time The Relay Was On.The Capacitor Discharging Time Is To Be Calculated For The Relay Off Delay Time.It Is Simple Time Delay Project.

Notes:

If You Will Change The Resistor Value Or Capacitor Value.This Changes Gives Adjust The Time Delay.

Part List:(For Basic Circuit)

1. BC 547 Transistor=1 pc

2. 1000µF/25 V Capacitor=1 pc (As Your Optional Time Limit)

3. 12 Volt SPDT Relay=1 pc

4. 10kΩ ¼ Watt Resistor=1 pc(As Your Optional Time Limit)

5. Push Switch=1 pc

6. 12 Volt Power Supply=1 pc

My Project Records:

1. 1000µF/25 Volt Capacitor And 10KΩ=45 Seconds

2. 1000µF/25 Volt Capacitor And 22KΩ=1 Minute 10 Seconds

3. 2200/25 Volt Capacitor And 10KΩ=1 Minute 38 Seconds

4. 2200/25 Volt Capacitor And 22KΩ=2 Minute 42 Seconds

Basic Circuit Diagram: