Re: Homebrew power supply

From: Active8 (reply2group_at_ndbbm.net)
Date: 11/03/04 

Date: Wed, 3 Nov 2004 12:30:50 -0500

On Mon, 01 Nov 2004 21:52:51 GMT, Vidar Løkken wrote:
<snip>
> Yes, this seems perfectly fine :) Also, you will have to rectify. Pass
> the +ve and -ve trough a rectifier bridge, and take out + and -, and let
> GND be all alone, do not run that trough any diodes or so...

He means this:

                                             ____
                                            | |
                                   +----+---|7805|--+------ V+
                                   | | |____| |
                                   | --- | ---
   fuse -. ,-------+ | --- | ---
           )|( | +-+----+ | | |
           )|( | A A | | |
         |-' '-+ +------+ | | | |
         |-. ,-+--+ +------(-+ +-----+-----+----+
           )|( | | A A | | | |
           )|( | | +-+----+ | | | |
          -' '----|--+ | --- | --- ===
                  | | --- _|__ --- GND
                  | | | | | |
                  | +----+---|7905|--+------ V-
                 === |____|
                 GND
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Google for "Ian Purdie power supply" (or suplies). He covers that
well enough - selecting caps for a specified load current and ripple
and stuff like that.
>
> [...]
>
>>
>> Is it a good plan? Thanks for the input, hopefully I can build something
>> far cheaper than an off-the shelf supply and learn a lot whilst building
>> it.
>
> I guess you should be able to that. PSU is damn expensive. Something
> like 300$ for a simple regulatable psu with voltmeter and short
> protection and such is quite usual...
>>
>> Regards,
>> Dave 

-- 
Best Regards,
Mike