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
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.
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
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.
Then, he try to apply the DC pump as load. As video below.
This project of homeshooling boy is fist Electronic times we have happy it works great.