The problem is finding a battery charger for a cordless drill. I
inherited a Skil 12-volt drill and battery, but no charger. The only
hope of finding one seems to be getting a used one, which I haven't been
able to find.

I opened my friend's charger and drew the circuit, which I've attached a
link to. (PDF, and a big one, sorry; somehow a little bitty 35 KB JPG
made the file bloat up over a megabyte.)

Can someone comment on this? I've got all the values except for the one
resistor in series with the LED, which I can probably figure out (or
maybe just omit altogether, as it seems only to be an indicator lamp).

What's the function of the capacitor? (I believe it's a non-polarized
electrolytic in the original unit.)

Would this work if I constructed it?

The other problem is that the battery has 3 terminals instead of just 2.
Two are marked "+" and "-", but there's an unmarked middle terminal. But
the charger only had connections to the two terminals. What's the 3rd
terminal for? (Picture of bottom in the PDF.)

Oh, yeah, the PDF is he
http://www.geocities.com/bonezphoto/...eryCharger.pdf


--
Pierre, mon ami. Jetez encore un Scientologiste
dans le baquet d'acide.

- from a posting in alt.religion.scientology titled
"France recommends dissolving Scientologists"