RE: [AVR-Chat] Re: back-up power supply circuit
2004-03-22 by Claxton, Dean J
Kat - any particular brand of batteries I should steer clear of? Saw this today : http://www.mittoni.com.au/catalog/product_info.php/products_id/1342?sID= ca769521c5a6fbeffead3199da9a3e25 Seem good value, but not if they explode in your camera! Regards Dean Claxton
Show quoted textHide quoted text
-----Original Message----- From: Kathy Quinlan [mailto:kat-yahoo@kaqelectronics.dyndns.org] Sent: Saturday, 20 March 2004 1:36 AM To: AVR-Chat@yahoogroups.com 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