Simple 12V 2A DC power supply

Today, my son builds a simple 12V 2A DC power supply for a 12V solar pump. It is an Unregulated power supply because load is DC motor only.


Note: More circuits

12V Power Supply


How to works
I teach son to understand the working principle of this projects. The main principle, we use this project to reduce voltage from AC-line 220V to 12V DC.

On Figure 1 The AC 220V 50HZ is connected to the circuit through S1- ON-OFF switch and F1-fuse to protect this circuit. Then they flows through a 2A transformer to reduce voltage into 12V AC. Next,through the both Diodes to rectifier AC to DC converter. Then,at a capacitor as filter to DC voltage. The LED1 is power on display and R1 limit current for LED use.

schematic-diagram  of Simple 12V 2A DC power supply
Figure 1 the schematic diagram

Parts you will needs
T1____12V CT 12V, 2A transformer
D1,D2____1N5402, 3A Diode
C1_______2,200uF 25V Electrolytic capacitor
R1_______1.2K 0.5W Resistors
LED1_____LEDs as you like
S1_______ON-OFF switches
F1_______Fuse 1A
Copper wires and nail 0.5inch, AC line power

How to builds
This projects myson do yourself a many steps. Begin of all, put the paper on a sheet of plywood and Hammer a nail into the parts joint.(Figure 2) He soldered all parts on nail head instead of the PCB.(Figure 3). All parts at AC line is high voltage I connect them instead myson.

Hammer a nail into the parts joint
Figure 2 Hammer a nail into the parts joint

soldered all parts on nail head
Figure 3 soldered all parts on nail

When completed, He measure voltage at output is 17V No load (Figure 4)
measure voltage at output is 17V No load
Figure 4

Then, he try to apply the DC pump as load. As video below.

measure current of load
Then He measure current of load is about 0.9A as Figure 5

put it into the box
This project is applied at outdoor so he put it into the Plastic boxes to protect water as Figure 6

This project of homeshooling boy is fist Electronic times we have happy it works great.

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