Cor van de Water wrote:
I did not have a reed relay when I was doing a similar test, so in order
to measure the time with the analog clock, I powered the clock from the
battery under test using a series connection of around 100 Ohms resistor
and 3 diodes in series to get about 1.8V for the clock. Connect this to
the load resistor to measure discharge time.
I had to put a large enough Electrolytic capacitor across the clock
power to supply the peak current of the mechanism to move the hands of
the clock.
That's a good solution, too. Though, these clocks only average around
200uA, so a much larger resistor should also work fine.
I'll bet you could use a 4.7k resistor, and a red LED to provide the
1.5v drop. A 1000uF capacitor across the LED should be more than enough
to provide the pulse of current needed once a second when the clock
"ticks". The LED would also provide a visual indication that the load
(and clock) are "on".
--
We live in a society exquisitely dependent on science and technology,
in which hardly anyone knows anything about science and technology.
-- Carl Sagan
--
Lee Hart -- See my Xmas projects at www.sunrise-ev.com/projects.htm
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