Running PCs on 12v

From: Joe <rigdonj_at_cfl.rr.com>
Date: Sun May 18 10:01:00 2003

At 08:44 PM 5/17/03 -0400, you wrote:
>+AD4- the data sheet of many 3 terminal
>+AD4- regulators shows how...
>
>FWIW all the 7085's (and 7905's, whatever they
>are)

   The 7905s are minus 5 V regulators. It uses - voltage input (say -12VDC)
on the first pin, return for both the input V and output V on the second
pin and outputs a regulated minus 5VDC output on the third pin. IF your
power input is floating (no common ground) you can use a 7805 (+5 VDC)
rgulator to do the same thing. Connect -Vin to pin 2, +Vin to pin 1, +Vout
to pin 3 and -Vin to pin 2. The important thing to remember with this
circuit is that the input and out sides do not have a common ground. That's
not a problenm in some applications but it is in others.

 that I get came w/o datasheets.
>Guess I picked them up too cheap.

   You hardly need a data sheet for a 78xx or 79xx. They're extremely easy
to use. Once you'd used them once you should need to look a a data sheet
again.

  Joe


>
>John A.
Received on Sun May 18 2003 - 10:01:00 BST

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