How to make 5v adjustable current power supply

how to make 5v adjustable current power supply easy at home with the help of video and simple circuit diagram.

How to make 5v adjustable current power supply

In this project we learn how to make 5v adjustable current power supply easy at home with the help of video and simple circuit diagram. in this project we also use LM7805 voltage regulator for regulate voltage. you can easily adjust current with variable resistor. For making this project we need some components,

Components:

24v or 12v 10 amps Transformer
LM7805 Voltage regulator
TIP3055 Transistor
BD139 Transistor
35v, 220uf capacitor
35v, 4700uf capacitor
10A10 diode
10K Variable resistor
Heatsink
1N4007 diode
Soldering wire
Soldering iron
PCB Board

Now following few simple steps and make your own power supply,

5v adjustable current power supply circuit diagram

Transformer has 2 side, 1st side called primary and 2nd side called secondary
Primary side or primary winding use for 220v input power supply
If you use 12-0-12 transformer then you can see 3 wires connection,
Connect 10A10 diode with 1st wire of transformer.
Now leave 2nd wire and 3rd wire use for ground wire,
35v, 4700uf capacitor has 2 pin,
Positive pin connect with 2nd side of 10A10 diode and negative side connect with ground wire.
Now input wire of LM7805 voltage regulator connect with 2nd side of diode
1N4007 diode connect with ground wire of voltage regulator and ground wire.
Now collector pin of BD139 connect with output wire of voltage regulator,
Variable resistor has 3 pin,
Middle pin connect with base of bd139,
1st and 3rd pin connect with collector and emitter pin, like diagram,
Now TIP3055 transistor base pin connect with emitter of bd139 transistor
And collector pin connect with input pin of voltage regulator,
Now positive side of 35v, 220uf capacitor connect with emitter pin of TIP3055 transistor,
And negative side of capacitor connect with ground wire,
Finally emitter pin of TIP3055 transistor use for positive output and ground wire use for negative output.

BD139 NPN Transistor has 3 pin