Power supply circuit with variable voltage
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

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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