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Power supply without transformer with triac

2015-03-16 22:04  
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A power supply without transformer can be made using electronic diagram below. This allows to power a device that requires a voltage of 12 volts, without using a transformer . Using this power supply can be powered a consumer requiring a maximum current of 10 mA.
Circuit is powered from the mains voltage 220 volts. Zener diode connected in emitter transistor is 11 volts Bc109. Triac used must withstand 150V/150mA.

Symmetrical voltage power supply circuit High current power supply circuit 5-20V fixed output power supply circuit using LM2941C 0 40v adjustable power supply with L146 Lm723 circuit0 40v adjustable power supply with L146 Lm723 circuit configuration Circuit Diagram:  Power supply without transformer with triac circuit diagram