From the core of my heart I am Wishing you a very very Happy and prosperous new year,…..
It’s may brings you new lease to your life and gives you the best of everything………………….
After a long interval I am writing this post, actually due to work pressure, I can’t manage time to write something, in this blog www.abhieeeprojects.blogspot.com I am trying to give guidance to beginners from very initial step, every one who works with projects of electronics or electrical must need a power supply to power that specified circuit,
In electronics project we mainly need de power supply, specific voltage for specific circuit, some circuit needs 5 volt supply and some circuits needs 9 or 12 volt supply, but it is difficult to arrange separate power supply device for separate voltage,
Here I am giving you the solution how to get different values of voltage from a single power supply device,
Today’s project- variable dc voltage supply for personal lab
What you need -1. A step down transformer (input 220 volt ac and output 24 volt ac)
5 general purpose diode for rectification
Capacitors-2200uf 64 volt,0.1uf,1uf 64volt
Resistors-20k,5k variable resistance,220ohm
One red led
One 1amp fuse
And the most important one is ic LM317, the
|simple variable dc power supply for personal lab|
How the circuit works?
Circuit made by me-
Special note- during the process the ic becomes very hotter, so you must add a heat sink with it ,
You my use a variable resistance of 100k instead of the 5k resistance shown in the figure, the voltage variation will be slightly different,
You may use this circuit as a battery charger also,
Always keep the circuit in a plastic box, to prevent electric shock,
Thank you for reading