Adjustable Power Supply DIY Battery Charger

Introduction:

An Adjustable Power Supply is an essential tool for anyone who tinkers with electronics. It’s a device that allows you to adjust the output voltage and current according to your needs. In this DIY guide, we will be building an Adjustable Power Supply DIY with the help of two 2n3055 transistors, one LM317 Regulator IC, one BD139 transistor, and few other components.

The advantages of building your Adjustable Power Supply are numerous. Firstly, it’s cost-effective. You can save a lot of money by building your own Adjustable Power Supply rather than buying one from the store. Secondly, it’s customizable. Since you are building it yourself, you can customize it according to your specific needs. Thirdly, it’s a great DIY project that can help you understand the basics of electronics.

Description:

I am assembling here a powerful Adjustable Power Supply DIY of 0-30 volts and 10 amperes. A pair of 2N3055 transistors is used with BD139 and LM317 to control voltage and amperes. I hope you will like this video.

Adjustable Power Supply DIY - How to make battery charger
Adjustable Power Supply DIY – How to make Battery Charger



Circuit diagram

of Adjustable Power Supply DIY

Before assembling the circuit, it’s important to understand the circuit diagram. The Adjustable Power Supply circuit consists of four main sections – The Transformer, Rectifier, Regulator, and Output. The transformer converts the 220V AC voltage to 30V AC. The rectifier converts the AC voltage to DC, which is then filtered using the electrolytic capacitors. The regulator (LM317) regulates the output voltage, and the output section delivers the output to the load. The circuit diagram for the Adjustable Power Supply is as follows:

Adjustable Power Supply DIY Circuit Diagram




More Circuit Layouts





With that said, let’s dive into the process of building an Adjustable Power Supply.

2N3055 Transistor Pinout for Variable Power Supply Circuit Diagram
2N3055 Transistor Pinout

Components List

used in Adjustable Power Supply DIY

To build an Adjustable Power Supply, you will need the following parts:

  • 2N3055 Transistor x 2
  • LM317 Regulator IC x 1
  • BD139 Transistor x 1
  • 7805 Regulator IC x 1
  • 0.1uf (104J) Capacitor x 3
  • 0.33 Ohms / 5 Watts Resister x 2
  • 1k Resister x 1
  • 220 Ohms Resister x 1
  • 10k Potentiometer x 1 with knob
  • 5k Potentiometer x 1 with knob
  • 0-30 Volts Digital Volt Meter x 1
  • 12 Volts On/Off Switch x 1
  • LED x 1
  • 4mm Banana Connector Socket x 1 Pair
  • 12v-0v-12v Transformer
  • 6-10A Bridge Rectifier
  • 6800uf / 50v Capacitor
  • 104J / 0.01uf Capacitor



Project Images

of Adjustable Power Supply DIY

Image-1

Here I am using a 12-0-12 volt 8 Ampere transformer. I used both ends of the wiring to get 24 volts without using center tape. Also used a bridge rectifier. Solder both ends of transformer wires to pin-2 & pin-3 of the rectifier. I used a 4700uf capacitor and solder its positive side to pin-1 and negative side to pin-4. Also, I joined a pf 104J (0.1uf) in parallel with the capacitor. In this way, I am getting +24v DC from pin-1 and GND from pin-4.

Adjustable Power Supply DIY img1

Image-2

Following are 2N3055 transistors and I am using them in parallel. Solder their base with base, emitter with emitter, and collector with a collector.

Adjustable Power Supply DIY img2

Image-3

In the following image, I am showing the front panel of the power supply with a digital volt meter, 10k & 5k pots, an on/off switch, and positive/negative terminals for output.

Adjustable Power Supply DIY img3




Image-4

In the following image, connections of LM317 and BD139 are shown according to the circuit diagram provided above.

Adjustable Power Supply DIY img4

Image-5

Here I am soldering two pieces of 0.33 ohms/5 watts resistors in series with the emitters of 2N3055 transistors.

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Conclusion

Building an Adjustable Power Supply is a great DIY project that can help you understand the basics of electronics. With the help of two 2N3055 transistors, one LM317 Regulator IC, one BD139 transistor, and few other components, you can build your own cost-effective and customizable Adjustable Power Supply. The advantages of building your Adjustable Power Supply are numerous, and it’s an excellent way to get started with electronics. We hope this DIY guide has helped you in building your Adjustable Power Supply.

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