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

    Frequency comparator circuit
    Instrumentation-amplifier
    Stepper motor getting very hot wrong driver or power supply
    micro stepper
    mixing and volume
    A poormans oscilloscope
    Gag Circuits
    Phantom and T powering for condenser microphones
    Fundamentals of Electrical Engineering and Simple combination lock
    LM4561 LM4562 consisting of 170W power amplifier circuit



    Top