Power supply circuit with variable voltage
By using a transformer without ct, a bridge rectifier circuit system, and rotary switch, we can create a power supply for electronic equipment with voltage range from 3 V, 4.5 V, 6 V, 7.5 V, 9 V, to 12 V.
Add component such a rocker switch or a slide switch as the main switch, and put one LED as an indicator tool.
Power supply circuit with variable voltage as shown below
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhwBRorKsGptju4fY-NXpFDVf967jbzztrpOJnfoPnBTNsML8EZyPcJk-YMghfcwhyPP0mL_B1J-lhF97mCTN45MMmj0U1V2sDasA3bm03lI-qhL-mhPSU9DXEqC4HRA-nUjYEjKrWJFgNL/s400/Power-supply-circuit-with-variable-voltage+.png)
Click to enlarge
Components are required:
Add component such a rocker switch or a slide switch as the main switch, and put one LED as an indicator tool.
Power supply circuit with variable voltage as shown below
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhwBRorKsGptju4fY-NXpFDVf967jbzztrpOJnfoPnBTNsML8EZyPcJk-YMghfcwhyPP0mL_B1J-lhF97mCTN45MMmj0U1V2sDasA3bm03lI-qhL-mhPSU9DXEqC4HRA-nUjYEjKrWJFgNL/s400/Power-supply-circuit-with-variable-voltage+.png)
Components are required:
- S1 = Rocker switch
- S2 = Rotary switch (2 pole 6 lanes)
- T1 = Step-down transformer without ct (220V/12V 500mA)
- D1, D2, D3, D4 = Diodes IN4002
- D5 = LED
- R1 = Resistor 220 Ω
- C1 = Elco (electrolytic capacitor) 2200 μF/16V
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