AVR-Chat

Oh, I remember reading something about that awhile back. Someone suggested a
fuse, and with the double-diode you mention, that should make it fairly
safe.

For those that are not electronic technicians, there are no electronic
circuits that beyond failure. By all means a mechanical relay and its
contacts are more likely to fail than the PROPERLY rated diode.

Life is full of risks. The only way I know of to do away with all risks is
death. Ain't may folks jumping on that wagon.

Mike

----- Original Message -----
From: Kathy Quinlan <kat-yahoo@kaqelectronics.dyndns.org>
To: <AVR-Chat@yahoogroups.com>
Sent: Friday, March 19, 2004 10:36 AM
Subject: RE: [AVR-Chat] Re: back-up power supply circuit


>
>
> > -----Original Message-----
> > From: Mike Bronosky [mailto:Mike@Bronosky.com]
> > Sent: Friday, 19 March 2004 11:11 PM
> > To: AVR-Chat@yahoogroups.com
> > Subject: Re: [AVR-Chat] Re: back-up power supply circuit
> >
> >
> > I havent been following this back-up power supply circuit
> > very closely so I may be way off track here but...
> > All you need, besides the BATTERY, POWER SUPPLY and LOAD is 2 diodes.
>
> Been here lol, this was the first idea, but it was pointed out a diode
> failiure on the battery line could blow the batteries up (and after some
> of the crap NiMh I have found over the last couple of months that
> explode even in normal use.....)
>
> The relay Idea was floated as unless the contacts weld (not likely with
> only a couple of 100 mA) it is relatively safe.
>
> For Commercial designs I use 2 diodes on the battery line (this has UL
> approval on one of my marine designs (and also VME and others)
>
> It has also been suggested to use a power management chip or reg with
> battery input etc.
>
> Regards,
>
> Kat.
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.618 / Virus Database: 397 - Release Date: 9/03/2004
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
> ---
> [This E-mail scanned for viruses by Declude Virus]
>
>

---
[This E-mail scanned for viruses by Declude Virus]