PSN-L Email List Message

Subject: Re[2]: noisy power supply
From: Angel Rodriguez angel@............
Date: Wed, 5 Jul 2000 22:57:44 -0500

Hello CapAAVSO,

Wednesday, July 05, 2000, 4:20:35 AM, you wrote:

Cac> In a message dated 7/5/00 7:12:13 AM Eastern Daylight Time, 
Cac> other@............... writes:

Cac> << It may also be worth while making up a separate plus and minus 12 volt
Cac>  regulated non switch mode power supply for the analogue parts of the
Cac>  electronics. I do this in computers where I need to get clean audio in and
Cac>  out. >>

Cac>     Dual plus and minus power supplies (non-switching) are easily made from 
Cac> parts all of which are usually in stock at your local Radio Shack. Buy two 
Cac> 12.6-volt transformers, Two full-wave bridge rectifiers, Two 1000 mfd 
Cac> electrolitic capacitors, Two 12-volt positive regulators and two 0.1 mfd 
Cac> capacitors. Build two separate 12-volt power supplies and hook them in series 
Cac> to make a +12V, -12V dual power supply. Radio Shack sells a little book about 
Cac> power supplies which you should also buy if you are not sure how to hook the 
Cac> above stuff together. With the help of the little book anybody can build 
Cac> their own dual power supply for far less than an off-the-shelf dual supply 
Cac> would cost.

Cac> Have fun,
Cac> Cap
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I have some -+ 12 volt supplies I have made for other projects.
Where should I make the connections??  Do you suggest cutting
and splicing the main power connector that goes to the ATX mother
board??  This my first ATX computer and it seems that the power is
switch on and off a bit differently than on an AT computer.  The power
off is just a software thing.
Best regards,
 Angel                            mailto:angel@............


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Larry Cochrane <cochrane@..............>