In article <51mum0$86h@viking.mpr.ca>, Bob Wilson <bwilson@mpr.ca> wrote:
[.. much good stuff..]
I've used the LM317 and a few parts to make chargers and have good luck
with them.
For example:
I ------- O R1
VI----------------| 317 |--------------/\/\/\/\/\----------
------- | | |
A | / / |
| R2 \ R3 \ |
| / / |
| \ \ |
| | | Q1 PNP |
| | \| |
| | |----------------
---------------/|
|
/
\ R4
/
\
|
GND
R2 and R4 sets the "float" voltage.
R3 sets the "Fast charge" voltage.
R1 saturates Q1 and sets the current limit.
Add bypasses: from U1-I to Gnd
from U1-A to U1-O
from U1-O to Gnd
--
--
kensmith@rahul.net forging knowledge
Date: 19 Sep 1996 05:19:25 GMT
Original Subject: Re: Gel Cell charging IC?