Circuit description

This power supply circuit uses chip TL494. Similar circuit is used in the most power supplies with output power about 200W. Device use push-pull transistor circuit with regulation of output voltage.

ATX Power Connector Pin Signal Color 1 Color 2 Pin Signal Color 1 Color 2

1 3.3V orange violet 11 3.3V orange violet

2 3.3V orange violet 12 -12V blue blue

3 GND black black 13 GND black black

4 5V red red 14 PS_ON green grey

5 GND black black 15 GND black black

6 5V red red 16 GND black black

7 GND black black 17 GND black black

8 PW_OK grey orange 18 -5V white white

9 5V_SB violet brown 19 5V red red

10 12V yellow yellow 20 5V red red

Schematics Circuit Diagram

200W ATX PC POWER SUPPLY
Circuit description
ATX Power Connector
Schematics Circuit Diagram