AVR-Chat

Don't go through all the trouble of trying to design a low noise switcher.
You can get one from these folks.  I think these supplies are about $11-$12
and they are pretty good.

http://www.astrodyne.com/catalog.asp?pagetype=search&prtno=asd105&srchtype=w
eb&code=usa

I have dealt with Astrodyne for years, and they make good, inexpensive
stuff.

Steve

-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of Enki
Sent: Wednesday, September 17, 2008 10:06 AM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] RE: Powering an AVR with a switching regulator

On 17 Sep 2008 at 21:29, Xiaofan Chen wrote:

> On Wed, Sep 17, 2008 at 8:50 PM, Enki <enkitec@gmail.com> wrote:
> >        I have used this design:
> >
> >        Ultra Simple 5V Switchmode Regulator
> >        http://sound.westhost.com/appnotes/an006.htm
> >
> >        A nice cheap switching regulator.
> >
> >        There is an even better version here:
> >
> >        Simple Switching Regulator
> >        http://www.techlib.com/electronics/regulators.html
> 
> I will not recommend this kind of circuitrs unless for cost
> reasons. They tend to be quite noisy.
>

	The first one, yes.
	The second circuit is a lot better.
	No difference compared to one MC34063 based.

	Mark Jordan