Sunday, February 07, 2016

High Voltage Variable Power Supply LM317

High Voltage Variable Power Supply

This circuit is a variable power supply using IC LR12 of Supertex inc. The difference of this circuit compare to variable PSU using LM317 is it can hold a high voltage input (100V) and can deliver an output of around 88V max down to 1.2V. This regulator is very suitable to DC circuits using higher voltage with current less than 100mA. The output voltage is controlled only by R1 and POT using the relationship below:
Voutput = 1.2(1 + POT/R1) + ADJ*POT or just use the LM317 calculator.

circuit of high voltage variable voltage regulator  schematic diagram

circuit of high voltage variable voltage regulator  schematic diagram

LR12 pinout
Part List:
R1  - 560 ohms 1/4W
POT - 50 kilo ohms potentiometer
C1 - rated above 100V capacitor ( you can remove if DC is regulated)
C2 - 470nF (higher the better) capacitor rated 100V minimum
IC - LR12 or similar regulator IC

Note: The circuit is easy to construct but it is powered by high voltage DC that can be fatal. I dont recommend building this one if you don't have any idea in electronics. Remove only C1 if the DC input is regulated.

Read more at http://www.simple-electronics.com/2011/11/high-voltage-variable-power-supply.html#k63QU2qeqBJQ5pwG.99

Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.