Return address is VALID.
Bunch of stuff For Sale and Wanted at the link below.
Toshiba & Compaq LiIon Batteries, Test Equipment
Honda CB-125S $800 in PDX
TEK Sampling Sweep Plugin and RM564
Tek 2465 $800, ham radio, 30pS pulser
Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/
I think that if you'd have been reading and studying (even if you
learned nothing) before the 1st post and the lazy while we work
comment, you'd have gotten more action than my flame and this, dude
Please view this totally cool (read appropriate) circuit in a
fixed-width font such as Courier.
I gave you a perfectly good link you can hack to control it on and
off but it goes to trickle mode when it's done anyway. What did you
think of that? It can be stripped down to a 7805 in current source
config and you just turn it on and off or use the VMOSFET.
You want to charge what from a 9V batt? Your robot or your fuzz
Bob Monson's circuit can be turned on and off also.
OK, your link. it's a 120mA approx current source that you can turn
off and will run off a 9V batt for a couple hours until you need to
charge the 9V batt. You're not serious, are you? You couldn't find
the V source part, right? Your resistor values are non standard.
decades of 5.1 and 8.2 are available.
For years I've used the following circuit for charging NiCd cells. It is
very simple and has the added advantage of providing visual indication
of charging in progress. The regulation isn't great but it's good enough
for battery charging.
Any non-Darlington NPN with a reasonable gain (>20 or so, less gain =
poorer regulation) can be used as long as it can handle the power
dissipation (0.8 W for the values shown). The values shown assume a LED
voltage of 1.6 V @ 15 mA. The 4.7 ohm resistor sets the charging
current, adjust as necessary. You can "turn it upside down" and use a
PNP if you want one of the battery terminals ground referenced.
+5 V ---+------------> +
| 200 mA to Battery, 1-2 NiCd cells
150 / +---> -
Red | |
LED | |
<= \ / /
_V_ \ 4.7