Why isn't solar an option? Yes it is darker in a temperate rain forest =
than the plains - you'd get a lower output from the cell but it would =
still charge the battery somewhat.
Sounds like a good project for nuking the possums.=20
I enquired about low current regulators a while ago - someone mentioned an =
SMD from Seiko - can't remember the part # - but it was below double digit =
microamps!=20
0100,0100,0100Thanks for all the useful comments on =
the 6V lithium.
Perhaps I should explain a few things. The only reason why I'm
using that particular battery is because it's long lasting, high
capacity and readily available. I didn't choose it myself so maybe
there are some good alternatives less than 5V and then I wouldn't
use any regulation at all. I know there are 4.5V Duracel batteries
(MN1203) that cavers use. Maybe if they had a 5 year shelf life
that would be the answer.
The circuit is a bait dispenser and will live in the bush, so solar is
not an option. The battery has to be capable of supplying 3A in
short 3 second bursts once in a while.
The reason I was in a hurry is because prototypes had to be ready
for a trial, but now that rush is over I have time to perfect the final
version.
I liked ArialMatt Pobursky's suggestion =
of that TI TPS7250 low drop out regulator except that its quiescent =
current is 180uA. My circuit
draws 290uA on average so I think the two diodes would waste
less energy (haven't done the sums). I see that it has a 0.5uA
sleep state so maybe I could work out something there.0100,01=
00,0100Architect
Paul Gaastra email:pgaastra@hortresearch.co.nz
BioEngineering Technologies, HortResearch
Private Bag 3123 phone +64 7 8584745
Hamilton, NEW ZEALAND fax +64 7 8584705
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