The schematic diagram of this regulated power supply is shown above. The circuit board can be made of fiberglass board according to the middle picture and the following figure, and it is processed by small steel saw. Then use an electric drill or a hand drill to make a small hole in the position shown below. Rive the spare with a φ1.3mm hollow rivet. There are no rivets at the threading holes and mounting holes.
In the case of complete electronic components, it is always conceived what to use as the outer casing. I thought of using a plastic lunch box to make the outer casing. Finally, I saw that there is a plastic spice box that is suitable for purchase. The most difficult to process is the outer casing, which is manually drilled and troweled or used as spare parts according to the requirements of the components. If conditions permit. You can spray white paint on the box, so that it looks better and the box is processed, you can assemble it.
First install the header and terminal, because the two screws are in the lower layer, do not install them first, the above is installed first, the following can not be replaced, no assembly operation.
After the circuit board is soldered and connected, the overall installation connection is required. Fans only need to install the schematics and photos in kind. It will succeed. Of course, you must carefully check the drawings and lines before power-on. After confirming the correctness, you can conduct the power-on test. The general installation is correct. After the power is turned on, the voltage can appear on the voltmeter. The power supply can be adjusted from 2V to 12.5V. The effect is ok. Within the adjustable voltage range, the full-load (0.3A) voltage drops within 5%, in line with the requirements of the simple adjustable power supply.
After listening to the radio, listen. Very quiet, there is no hum and modulating hum, just like using a new battery, it is a very good homemade electronic product. It is worthy of electronic enthusiasts to imitate production. The other group is the rectified filter output. Not regulated, can be used as a backup power supply.
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