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Switchable 6V, 9V, and 12V Linear Voltage Regulator

2015-09-15 19:22  
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We can build a multiple voltage power supply 6, 9, and 12V? (AC-DC Adapter) with the circuit shown in the following schematic diagram.? Not only provide multiple voltage output with single voltage supply, this circuit add the benefit of regulating the voltage for better stability.

Switchable Linear Voltage Regulator circuit schematic

A transformer with rectifier diodes and filtering capacitor can be used to supply this circuit. You can use 1 A 15V transformer with 2200uF filtering capacitor for the AC to DC adapter. The transistor TIP31 should be installed with proper heatsink to avoid overheating.

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