Battery takeover for poor line voltage - Page 2 - Electronic Circuits Projects Diagrams Free

**Nigel Goodwin** · 11th June 2007, 11:33 AM

Quote:

Originally Posted by Gayan Soyza

Will see how long he will use his battery even with a trickle charge current through this 50 cent resistor continuousely?

NiCd and NiMh are designed to be permanently trickle charged - even complex chargers do the same thing, except they fast charge the battery first, then drop to a trickle charge.

Hero999 · 11th June 2007, 10:56 PM

If you want to charge the battery in 20 hours then tricle charge is fine but most people don't want to wait that long and this is why battery manufacturers have developed complex fast chargers.

mneary · 12th June 2007, 06:45 AM

Also be aware that most "9v" rechargeable batteries are actually 7.2v, although some are 8.4v.

SDG · 12th June 2007, 01:00 PM

Quote:

Originally Posted by Ratch

I *think* I've traced it down to our air conditioners (and the rest of the neighborhoods a/c's) changing the incoming line voltage, causing the camera power to change slightly, resulting in slight frequency shift. They're cheap little cameras, so input power affects frequency. The shift is just enough to cause annoying lines on the screen, which fools the software into thinking it's motion and constantly recording...

If this is truly the problem, then the solution is to get a decent power supply that can maintain proper regulation. You don't need a UPS/battery for this.

Hero999 · 17th June 2007, 02:27 PM

True, but this circuit is very handy to keep data CMOS static memory when the power is interrupted.

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11th June 2007, 10:56 PM	(permalink)
Hero999	If you want to charge the battery in 20 hours then tricle charge is fine but most people don't want to wait that long and this is why battery manufacturers have developed complex fast chargers. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

12th June 2007, 06:45 AM	(permalink)
mneary	Also be aware that most "9v" rechargeable batteries are actually 7.2v, although some are 8.4v.

17th June 2007, 02:27 PM	(permalink)
Hero999	True, but this circuit is very handy to keep data CMOS static memory when the power is interrupted. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez