200W PC ATX Power Supply Circuit
This ATX power supply circuit uses chip TL494 from DTK Product. Similar circuit is used in the most power supplies with output power about 200W. It uses push-pull transistor circuit with regulation of output voltage. Line voltage of the ATX power supply goes through an input filter circuit (C1, R1, T1, C4, T5) to the bridge rectifier. When a voltage is switched from 230V to 115V, then a rectifier works like a doubler. Varistors Z1 and Z2 have over-voltage
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