How to Make Dual Power Supply Circuit

In this project, we’ll teach you making a dual power supply circuit. This circuit generates two different output voltages from a single input source. This circuit can ensure stable power supply to the device as well as it helps to prevent system damage. Many electronic circuits require a source of DC power. This dual power supply circuit mostly used for high quality amplifier circuit. To make this circuit, at least we need to use two capacitors. Sometimes we need to use four, six or eight capacitors. The dual power supply provides positive as well as negative potential with the ground.

The article is being published in collaboration with JLCPCB. They supply high quality PCBs at a very reasonable price. They also can provide SMT circuit assembly.

We thanks to our sponsor JLCPCB for sponsoring us PCBs for this project circuit.

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To make this powerful dual power supply circuit, we might need some electronics component.

All Component list have to been given below –

Component List –

•        Transformer – 12.0.12 volt (1.5 amp)
•        Rectifier Diode – 1N 5399
•        Resistor – 1 KΩ
•        Capacitor - 2200µf/ 35 volt
•        Soldering Iron
•        LED – 5mm

•        Constant Power
•        Multiplies Supply Frequency
•        Increases Power Output
•        Budget-Friendly
•        Ease of Installation
•        Constant Power
•        User-friendly

To make this dual power supply circuit, we are using a 12 volt 1.5 ampere transformer. All transformers have two sections. One is Primary section and the other one is secondary section. Primary section is for input voltage and secondary section is for output voltage. 220v AC cable is connected with primary section of transformer and 12v AC output from secondary section.

In the secondary section, there are three cables. If we count it’s cable as a like T1, T2 and T3. Here T1 and T2 contain AC 12v, T1 and T3 contain AC 24v, T2 and T3 contain AC 12v.

The schematics of PCBs can be seen above.

To make this dual power supply circuit, 1^st we make a bridge connection of these 4 diodes. We connect one diode anode terminal with another diode cathode terminal. Again make the same circuit connection. After this, we connect two diode anode terminals and connect other two diode cathode terminal. 

We make a series connection with these two capacitors. That means, we connect one capacitor negative leg with another capacitor positive leg.

Now we connect diode positive leg with capacitor positive leg and connect diode negative leg with capacitor negative leg.

For power indicator, we need to connect a LED light. We are using a red color LED light. The red LED light can glow with only (1.5-3) volt, for that we need to connect a resistor with this LED light. Now we connect 1 KΩ resistor with LED positive leg. Then we connect resistor with capacitor positive leg and then connect LED negative cable with transformer (T1) cable.

Connect transformer cable with the circuit. We can use 12v or 24v transformer. We connect transformer T1 cable with diode anode and cathode leg, T2 cable with capacitor positive and negative leg, T3 cable with diode anode and cathode leg.

For output voltage, now we need to connect three output cables with the circuit. We connect output positive cable with capacitor positive leg, connect output negative cable with capacitor negative leg and connect output ground cable with the place, where capacitor positive and negative leg is connected.

If you complete design of your PCBs, then it is time to order PCBs. To order best quality PCBs, just visit JLCPCB and click on the “QUOTE NOW” button.

Since 2006, JLCPCB continuously driven to become more efficient and to reduce costs. They promise to offer customers the most economic PCBs forever. JLCPCB makes cheapest but top quality PCBs possibly because of scale effect, extremely high production efficiency and less manpower cost.

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To order PCBs, make your Gerber file. Then drag and drop the Gerber file on the following box.

Click on “Gerber Viewer” button you can check the PCBs design. Make sure everything is good, then choose color, quantity and order your PCBs at very reasonable prices.

If you are a new user, then you can order 10 pieces PCBs, costing only $2. To place your order click on “Save to Cart” button. Confirm your shipping address and shipping method.

To order your SMT PCBs, visit JLCPCB.

1.    Drag and drop SMT PCBs file on site.

2.    Choose your PCBs color and quantity.

3.    To free SMT assembly for your PCB click on “SMT Assembly” button and then confirm.

4.    Add your Bom file and CPL file.

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7.    Pay your payment

8.    Wait for confirmation mail.

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JLCPCB supported all shipping method can be seen below.

Estimated Delivery Time -

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