-=> ROY J. TELLASON wrote to WAYNE CHIRNSIDE <=-

 RJT> WAYNE CHIRNSIDE wrote in a message to ROY J. TELLASON:

 -=> ROY J. TELLASON wrote to WAYNE CHIRNSIDE <=-

 RJT> WAYNE CHIRNSIDE wrote in a message to MATT MC_CARTHY:

 WC> When the heck is someone going to produce a standard ATX power
 WC> supply designed from the get go to be driven from either 120 AC or
 WC> 12 volt deep discharge batteries?

 RJT> I dunno,  but if you find such a critter that's not at an absurd price
 RJT> let me know...

 WC> By the time I thought of and formulated the plan
 WC> to do exactly this I was unable to follow through.

 WC> I _know_ I could make a comfortable living building and selling
 WC> these things.

 RJT> I dunno,  it would have to involve modifying an existing setup to work
 RJT> with a 12V input...  There's barely enough space on the rear panel of
 RJT> the one ATX box I can look at here,  and of the ones I've seen the
 RJT> inside of there isn't all that much room in there either.  The one that
 RJT> died on me a while back not only had a board in the bottom but also a
 RJT> smaller board mounted to the tops of the two heatsinks in there!

Well you simply add a winding to the torroid core transformer
and substitute transistors to handle both the voltage for 110
and current for 12 volts... well you'd need a switch as well.

 RJT> Some of the older AT-style power supplies sure seemed to have a lot
 RJT> more room in the box.  (Looking up at the one that's currently running
 RJT> the BBS machine in a full tower...)

 RJT> What do you think it would take to make this work?

Some wire, a switch and a couple of power FETS.
Everything behind the torroid should work just fine
if one designs the input correctly.
 
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