Today, my son builds a simple 12 volt power supply circuit for a 12V solar pump. It is an Unregulated 2A Power supply. Because a load is DC motor only.
Why you should learn this?
It is an example of an unregulated power supply working principle. Which they are basic of every power supply.
How it works
I teach son to understand the working principle of this projects.
The main principle, we use this project to reduce the voltage from AC-line 220V to 12V DC.(12 volts filtered power supply)
In 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 flow through a 2A transformer to reduce voltage into 12V AC.
Next, through both Diodes to rectifier AC to DC converter.
Then, at a capacitor as the filter to DC voltage.
The LED1 is power on display and R1 limit current for LED use.
Figure 1 the simple 12V 2A Power supply circuit 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
Make 12V DC power supply
This project, my son builds 12 volt filtered power supply with himself many steps.
First 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 the nail head instead of the PCB. (Figure 3).
All parts of the AC line is high voltage I connect them instead of my son.
Figure 2 Hammer a nail into the parts joint
Figure 3 soldered all parts on the nail
When completed, He measures the voltage at the output is 17V No load (Figure 4)
Then, he tries to apply the DC pump as load. As the video below.
Then He measures the current of the load is about 0.9A as Figure 5
This project is applied at outdoor so he put it into the Plastic boxes to protect water as Figure 6
12v 3 amp power supply circuit diagram
If you want 3A output. It is easy to change a few parts list:
1. Change transformer to 3A current.
2. Add more capacitor filter to 4700uF. By adding another one 2,200uF in parallel.
Is it easy?
This project of homeschooling boy is fist Electronic times we have happy it works great.Learn more: Designing 12V 5A Linear Supply
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