Dual DC power supply rectifier using 2 terminal transformer

If you are looking for a dual power supply rectifier circuit that uses only one secondary coil.

We have many ways to use it. Today we recommend two good circuits.

But these circuits are suitable for a low current load only.

Otherwise, it has too much ripple voltage or noise.

How to get Dual voltage supply from 2 terminal of the transformer

Are you up for it?

First Circuit# Dual 6V Power supply

Look at the circuit below. It is so easy dual power supply circuit. We can get +6V and -6V of output at current about 50mA.

Simple dual DC power supply using 2 terminal transformer

If your load requires dual voltage positive, negative and ground like OP-AMP circuits. You can try this circuit.

We placed both resistors to reduce a ripple voltage or small noise.

This circuit is an Unregulated power supply that uses a half-wave rectifier. It is easy but not good for all. Why?

Read next: Learn Half-wave rectifier on a DC supply

Parts you will need

  • T1: 6.3V, 0.1A secondary transformer
  • D1,D2: 1N4002 Diodes
  • C1,C2: 100uF 16V Electrolytic capacitors
  • R1, R2: 150 ohms 0.5W Resistors

Dual supply with Two Bridge version

This is Simple ideas for power supply. It has the certainty of damage due to accidental short circuits. Please very very be careful a lot.

Thanks a lot : observerms, Scott

It will convert any AC signal to DC unregulated voltage. In the circuit below, we use 2 bridge diodes and 4 electrolytic capacitors.

Dual DC power using 2 terminals of transformer

The first section is the normal mode. Which it includes first bridge diodes (D5 through D8) they act as full-wave rectifies ACV to DCV.

Then, a capacitor C4 will filter the pulsating DC into a steady direct current (DC).

The second section. Also, the AC signal from the input will flow to C1 and C2 to the Bridge rectifier (D1 through D4)

Then, the current flow to filter the pulsating DC voltage of out others bridge diode of the transformer. It causes us can connect directly the positive of 0 volts. Thus, the output will be symmetric both positive and negative.

And since C3 is charged by impedance higher than C4. Because of the value of C1 and C2. Thus, the value of C3 so must be more than C4, to cause a ripple of DC voltage symmetrical both positive and negative.

Not only that You can look other power supplies: Learn more

The voltage of the capacitors must be the same maximum AC voltage of the transformer. In the circuit, use 15V at the external current is 0.1A cause a ripple voltage of 1V.

More Dual power supply rectifier circuits

If you need to have a low ripple voltage than this. We must use more capacitance of all capacitors.

While we must use the voltage and the current rate of the diode to higher than the power transformer and the load.

Parts you will need

D1-D8 = 1N4007- 1000V 1A Diodes
C1,C2 = 2,200uF 35V Electrolytic Capacitors
C3,C4 = 1,000uF 35V Electrolytic Capacitors

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10 thoughts on “Dual DC power supply rectifier using 2 terminal transformer”

  1. Please, concerning thiis topic dual power supply using a two terminal transformer,can I also use it for high power amplifier like all those professional amplifier and slaves up to 70v supply?

  2. Simple ideas for a power supply should include a warning about the CERTAINTY off damage due to accidental short circuits when using this design.

  3. I don’t believe your “Dual supply with Two Bridge version” will work. The bridge rectifier for the negative voltage it appears will conduct current through it and on to and through the positive rectifier rather than through the GND and – legs (i.e., the negative regulator chip or transistors). Result: burn up the negative bridge rectifier.


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