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Science Forum Index » Electronics - Basics Forum » Draining all electrons from my olds batteries, any ideas ? :
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| Smiley |
 Posted: Mon Jan 29, 2007 1:50 am |
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Guest
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Hi,
I m looking for some ideas of applications where I can use my old
batteries, before recycle them. I allways get batteries with still some
power but who aren't good enough to do some usefull and reliable stuff.
I was heading to look at some charge pump chips ...
So what do you do with your olds batteries ?
Any ideas of fun projects ?
:-) |
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| David L. Jones |
| Posted: Mon Jan 29, 2007 2:33 am |
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On Jan 29, 4:50 pm, Smiley <smi...@nowhere.com> wrote:
Quote: Hi,
I m looking for some ideas of applications where I can use my old
batteries, before recycle them. I allways get batteries with still some
power but who aren't good enough to do some usefull and reliable stuff.
I was heading to look at some charge pump chips ...
So what do you do with your olds batteries ?
Any ideas of fun projects ?
:-)
If you get (or design) a torch with a very low drop out voltage
regulator (0.8V/cell), then that can be useful.
My AA maglight with LED conversion works to under 0.8V/cell and will
give a fairly constant output current until the death.
Dave  |
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| Bob Masta |
| Posted: Mon Jan 29, 2007 10:14 am |
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On Mon, 29 Jan 2007 00:50:29 -0500, Smiley <smiley@nowhere.com> wrote:
Quote:
Hi,
I m looking for some ideas of applications where I can use my old
batteries, before recycle them. I allways get batteries with still some
power but who aren't good enough to do some usefull and reliable stuff.
I was heading to look at some charge pump chips ...
So what do you do with your olds batteries ?
Any ideas of fun projects ?
:-)
Well, some folks claim my sense of "fun" is warped (!),
but I use "dead" 9V batteries to run low-voltage CMOS/LCD
clocks, kitchen timers, calculators, etc. The 9V may be no good
for many things when it drops to 7-8V, but it usually has
a long life (years) driving clocks before it drops to 3V,
since CMOS and LCDs draws so little current.
I make a tiny regulator using 1 or 2 bipolar transistors
and an LED or two as a voltage reference. Use big
resistors so you don't waste too much juice in the
regulator. The whole works can be sky-wired onto
a standard 9V battery clip (scavenged from still-older
batteries that are too dead even for this).
Of course, then you have to tape the 9V battery to
the back of the kitchen timer or calculator. That's
part of the charm, if you have warped sense of "fun"!
Best regards,
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Signal Generator
Science with your sound card! |
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| kell |
| Posted: Mon Jan 29, 2007 1:32 pm |
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Guest
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On Jan 28, 9:50 pm, Smiley <smi...@nowhere.com> wrote:
Quote: Hi,
I m looking for some ideas of applications where I can use my old
batteries, before recycle them. I allways get batteries with still some
power but who aren't good enough to do some usefull and reliable stuff.
I was heading to look at some charge pump chips ...
So what do you do with your olds batteries ?
Any ideas of fun projects ?
:-)
What you want is a "joule thief" circuit
Google will bring up lots of useful links. |
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