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:

New Circuits

.

 


Popular Circuits

Class-d-power-amplifier
Remote Selection Video Switch
Digital Alarm Speedometer Circuit
Jogging Timers
555 Timer As A Switch-Mode Power Supply
Audio noise filter circuits
H-bridge
555-channel temperature test circuits
Constitute a CMOS circuit time adjustment of a spot welder



Top