Simple power supply for LED strip

Good afternoon, dear readers! Today we will assemble a simple power source for low-power loads. Immediately make a reservation, the power of the scheme can be increased, but more on that later. This is how the assembled structure looks like: Pretty compact. Main Features:
  • Output Voltage - 12 Volts;
  • Power - 5 Watts;
  • A wide range of supply voltages;
  • Reliability.


So, let's start with the device diagram. She is now in front of you.
Simple power supply for LED strip
The high-voltage part is a single-cycle generator built on the basis of a single transistor. Parts list:
  • VT1 - mje13001 (or more powerful mje13003);
  • VD1 - 1N4007;
  • VD2 - FR107;
  • LED - an LED of any color (I took yellow);
  • R1 - 15 kOhm, 0.5-1 Watt (in order to increase the power of the circuit, I took 10 kOhm);
  • R2 - 300 kΩ;
  • R3 - 2.2 kΩ;
  • R4 - 1.5 kΩ;
  • C1 - 33 nF, 400 Volts;
  • C2 - 10 nF, 1 kV (I did not have a capacitor per kilovolt,therefore took 2 kV);
  • C3 - 100 μF.
Resistor R1 limits the output current, R2 discharges the capacitor after disconnecting the circuit from the network, the same role and R3. On the VD1 C1, VD2 C3 parts, half-wave rectifiers are assembled. A suitable transformer can be found in old chargers. Carefully disassemble the core, wind up the old windings and proceed to winding new ones. The primary winding (the same collector) consists of 200 turns of wire with a diameter of 0.08 - 0.1 mm. It is possible to wind both manually and winding mechanism. The latter is useful in that you can see how many turns already exist.
Simple power supply for LED strip
(In the photo, the counter shows an incorrect value) We wind up the coiled reel for breaks.
Simple power supply for LED strip
We put insulation, one layer is enough, and in the same direction we wind 10 turns of wire of the same diameter, isolate it.
A simple power source for an LED strip
Now take a thicker wire (0.5 mm) and wind it with a low-voltage winding. One turn is approximately equal to one Volt.I wound 14 turns to have a voltage margin.
Simple power supply for LED strip
We also apply a layer of electrical tape on the secondary winding. As the generator is single-ended, a piece of office paper should be placed between the core parts. We assemble the transformer, fix the core with scotch tape. Done!
Simple power supply for LED strip

Printed circuit board

Download fee: So, with the scheme and the role of its components figured out, now let's begin to manufacture the printed circuit board. To do this, we need a textolite measuring 2x4 cm and the printed circuit board itself.
Simple power supply for LED strip
Sand the copper part with fine-grained emery paper, then degrease with alcohol. Further by the LUT method we transfer the drawing to the board.
Simple power supply for LED strip
Simple power supply for LED strip
If something is not transferred, finish painting with varnish. We poison in hydrogen peroxide solution.I recommend this method of etching, as it is the safest, fastest and most accessible. After the etching process is over, we get our fee, wash it with water, wash off the toner and varnish with acetone.
Simple Power Supply for LED Strip
We're Soldering the Tracks
Simple power supply for LED tape
First, fill in the VD2 diode in its place, do not forget about polarity. The gray strip of the diode "looks" up.
Simple power supply for LED strip
Solder R2 resistor to capacitor C2 legs.
Simple power supply for LED strip
The remaining components are placed on the board in accordance with the following photos:
Simple power supply for LED strip
Simple power supply for LED strip

Power on

When you turn on one of the power wires for the first time, you need to connect a 40-60 watt incandescent lamp . This will protect your network from the consequences of a possible short circuit in the circuit.If the lamp does not light up during operation, then everything is fine and you can exclude it. Otherwise, find and correct the problem. Often, this is an excess of solder on the back of the board, which can shorten tracks.


The reliability of the circuit lies in the fact that in case of a short circuit at the circuit output all the energy is dissipated as heat on the resistor R1 Output power depends on the value of the resistor R1, the dimensions of the transformer and the diameter of the secondary winding, the voltage - from the number of turns. The scheme does not need adjustment. And this my article has come to an end. Good luck to everyone in the repetition!

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