AA Battery Charger

211

03:58:02

Charges 4 double AA batteries in series.
Im going to build this circuit this coming weekend. Any reason not to?

published 10 years ago

Natty

10 years ago

No, you've done a good job, but if you leave the switch open for about 7 seconds, with the capacitor discharged, the circuit will have some oscillations on your batteries, and this isn't a good thing for this ones. If you want see a similar circuit, search in every circuit's community this: capacitor v1.1 . It's my circuit and I think you can fix yours with this. Good work another time!

ETJAKEOC

10 years ago

You don't want to be dumping 6V into 4.5V worth of batteries, and those oscillations aren't real, it's mathematical noise, you can ignore that wave

ETJAKEOC

10 years ago

Set potentiometer to 37.5% for a perfect value ;)

Natty

10 years ago

I know in fact these oscillations are very low

GingerKing

10 years ago

I thought AAs were between 1.5-1.2v so 4x = 6.0-4.8v where is 4.5v coming from? The capacitor is my model for the 4 batteries. Ill let you guys know if anything blows up this weekend.

ETJAKEOC

10 years ago

Yeah. My bad, I counted 3, don't know why

GingerKing

10 years ago

I built it. The PNP started melting my breadboard and was dumping 1.1Amps because my base controlling PNP has a beta of 250. I have it running at around 400mA and the PNP is about 150-180 Fahrenheit.

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