In this post i am going to explain how to make a Electronic Dimmer or Transformerless Electronic Power supply or LED driver which can vary it output from o to 12v or even higher. This circuit can be a useful gadget for electronic hobbyist to test various appliances having different voltage rating for them. This circuit have a protection against Surge current while switched ON by Crowbar Network attached to its output. This design ensures that high current value is availabe at all voltage levels . So without wasting time lets get started....
I have previously explained various power supply on my blog but today we are going to learn a little bit about how to protect surge current from the circuit.
Previously i had explained about how to make a variable high current, high voltage from 0v to 300v using a Mosfet and transistor.
Today we will see how to use Thyrister or SCR (Silicon Controlled Rectifier) for making a variable voltage high current surge free transformerless electronic power supply or Led driver or Electronic Dimmer by using a Crowbar Network.
Now lets start making this circuit.
Components Required:
Resistance: 1 Mega ohm, 22 ohm, 5k preset or potentiometer.
Diodes: four IN4007 diodes, 24v/400mW zener.
