Re: [CAD_CAM_EDM_DRO] ATX Power supply soft power switch hack...Anyone done it?

Here's my guess:
It sounds like a built in solid state "relay" which works like this:
When the main power switch is turned on, this "relay" is de-energized.
pushing the "on" button energizes this relay and a set of "contacts" locks
the "relay" in the "power on" condition. The "power on" with the first push
of the button and the "power off" with the second push of the button may
likely be controlled by a solid state flip-flop "switch". If you can trace
the circuit that does this you can bypasss it. However, since it's probably
all solid state, your probably out of luck.
Smoke

> Isn't that an awful 'feature'? I had that problem too. I put a PC in a

car

> to play MP3s (and GPS mapping and other goodies) and had to press the

stupid

> power on button every time I got in. Only thing you can universally do
> would be to build a simple time delay one-shot circuit to pulse the

power-on

> signal. It could be done with a 555 timer, but I was too lazy. I just
> pushed the button.
>
> Some power supplies I've seen (later models) do 'remember' their power on
> state. You might go to your local computer dealer and see if they have

any.

>
>
>
> >From: "bilg63475" <bill@...>
> >Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
> >To: CAD_CAM_EDM_DRO@yahoogroups.com
> >Subject: [CAD_CAM_EDM_DRO] ATX Power supply soft power switch

hack...Anyone

> >done it?
> >Date: Sat, 05 Jan 2002 21:59:02 -0000
> >
> >I am trying to use a ATX computer with amd 900 athalon chip in a
> >machine and would like to simply power the computer up by switching
> >the ac line.
> >
> >This machine has a main power switch on the back of the power supply
> >which turns off all the power but when switched on, you still have to
> >use the soft power switch ( a spst momentary push button ) to boot
> >the machine and to shut it down.
> >
> >Jumpering this switch does not make it power on when the line is
> >switched and there are no bios settings which enable this feature
> >either.
> >
> >Has anyone else dealt with this problem?
> >
> >Thanks
> >
> >Bill
> >
> >
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