I need to use a PC ATX Power supply with a board that is not a pc mainboard.I have to use the ATXs Power On push button to start and stop the Supply in a matter similar to the PC mainboard.
Can anyone help ? A shematic would be appriciated.
Check
http://www.hardwarebook.net/connector/power/atxpower.html
for the pinouts. You'll have to make a small circuit with a toggle-flipflop (just use a 74xx74 and tie the /q output to the D input). R and S inputs to Vcc, pullup-resistor to the clock line, and the pushbutton between GND and the CLK input of the flipflop. Maybe some de-bouncing on the CLK line, a cap to GND helps a lot :-)
The chip can (has to!) run from the standby power, the rest of your circuit from the other power lines.
The easiest thing is of course to use a switch that directly puts GND to the /PS_ON signal - no circuit involved. Drawback: It's got to be a real switch, not a pushbutton like in the ATX cases.
ciao, -- Jens Sch�nfeld
-- Author: Jens =?iso-8859-1?Q?Sch=F6nfeld?= INET: [EMAIL PROTECTED]
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