How to 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 volt filtered power supply)
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 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.
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 projects, 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.
Then, he tries to apply the DC pump as load. As the video below.
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.
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