Showing posts with label 0 to 12v. Show all posts
Showing posts with label 0 to 12v. Show all posts

Thursday 3 April 2014

How to make 0 to 12v Variable High Current Transformerless Electronic Power Supply or LED Driver or Electronic Dimmer which is Surge Free.

How to make a 0 to 12v Variable Transformerless Electronic Power Supply or LED Driver or Electronic Dimmer at home.


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.