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.
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.
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
It will convert any AC signal to DC unregulated voltage. In the circuit below, we use 2 bridge diodes and 4 electrolytic capacitors.
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
Check out these related articles, too:
- Multiples ways to increase the power supply current
- Power Supply Splitter circuit using op-amp
- 12V Dual Power Supply using 7812, 7912
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