Recharging/Wall circuit?

timmeh87 · Post by **timmeh87** » Sat Jun 17, 2006 4:50 pm

gannon wrote:I'd recommend against using SteelFox15's circuit. Here's the one I designed last year, no clue if it'll work right or not though. Probably would be better to use an auto-switching dc jack and a real battery charging IC

so... how is it supposed to work?

Post by **gannon** » Sat Jun 17, 2006 5:00 pm

Well, R1 determines the charge rate of the batteries, and a current drop over R2 (the potentiometer) when the batteries finish charging should make the PNP transistor switch, activating the relay which should cut off the charge circuit. Odds are I made some errors in that schematic, I had a better version last fall but lost it in a server crash, this one is just a quick draw up of a crappy hand drawn one I found in my stack.

vskid · Post by **vskid** » Sat Jun 17, 2006 5:02 pm

gannon wrote:Well, R1 determines the charge rate of the batteries, and a current drop over R2 (the potentiometer) when the batteries finish charging should make the PNP transistor switch, activating the relay which should cut off the charge circuit. Odds are I made some errors in that schematic, I had a better version last fall but lost it in a server crash, this one is just a quick draw up of a crappy hand drawn one I found in my stack.

So you can charge and play with that curcuit?

TitaniumHamster · Post by **TitaniumHamster** » Sat Jun 17, 2006 6:00 pm

I've got a similar topic going on in N64.
http://benheck.com/phpBB/viewtopic.php?t=12598

This is my 3rd idea. It might work.

Post by **gannon** » Sat Jun 17, 2006 7:10 pm

Yeah, the design is made to be simple and probably at a 0.1C charge rate. Charging too fast when the batteries are in the portable can overheat the system anyways.

timmeh87 · Post by **timmeh87** » Sat Jun 17, 2006 8:47 pm

gannon wrote:Odds are I made some errors in that schematic

yeah... i was wondering why your potentiometer was hooked up weird. this might explain it.

Post by **gannon** » Sat Jun 17, 2006 9:10 pm

Actually, the potentiometer looks right, if anything is wrong it's the diode and the post charge section (looks like it needs a diode in that area to prevent battery damage/fire)

Edit: looked back at it and noticed that it's a center tapped symbol so one of the wires should be attached to the middle lead, not the end lead.

demonofaj · Post by **demonofaj** » Sun Jun 18, 2006 10:34 am

http://www.radioshack.com/search/index. ... 20resistor

I was wondering if this 2.2k one would be OK for his diagram?

benheck.com Forums

Recharging/Wall circuit?

Skyone's diagram resistor