Delayed ON LED

Posted on Feb 5, 2014

Here is very simple circuit in which the LED becomes ON only after a preset time the power supply is switched ON. When the power supply is switched on the transistor will be OFF. The capacitor now charges via the preset R3 and when the voltage across C1 is sufficient, the transistor switches ON and LED glows. The ON delay depends on the value of P

Delayed ON LED
Click here to download the full size of the above Circuit.

OT R3. You can increase the time delay by increasing the resistance of POT R3.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Logic Checker
    Keypad Combination Lock circuit
    Microcomputer-To-Triac Interface Circuit
    LED Volt Meter Circuit LM324
    DC Motor Speed Controller
    Data logging to Compact Flash and PCMCIA TDS2020F
    Breaker control signal circuit of the electromagnetic actuator