Adjustable Power Supply DIY Battery Charger

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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.

Circuit diagram

of Adjustable Power Supply DIY

Project Images

of Adjustable Power Supply DIY

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Here I am using 12-0-12 volt 8 Ampere transformer. I used both ends of wiring to gt 24 volts without using center tape. Also used a bridge rectifier. Solder both ends of transformer wires to pin-2 & pin-3 of rectifier. I used 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 of th capacitor. Like this way I am getting +24v DC from pin-1 and GND from pin-4.

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

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

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

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

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Components List

used in Adjustable Power Supply DIY

• 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