Total posts : 45366
After having a successful try at running
the C Crane FM transmitter just by sunlight
and nothing else, I went to step two.
Step two was (and still is) to run the 49 MHz STL
receiver just by the sun. Hook the two units
together and you have a solar powered
repeater, as I mentioned in the other thread.
Step three will be to change the STL to the
900 MHz band.
Step four will be to work on a recharge scheme
that is self sustaining.
Step two has failed so far. (Oh, and hi to
Carl, all my sun and sunlight data was just
about the same as the first experiment.)
I have four solar cells each supplying
6 volts at 50 mA. I put two cells in series
for 12 volts at 50 mA. I did the same with
the other two cells. The I paralleled both
pairs to theoretically provide 12 volts at
There is one slight problem here. The 49 MHz
receiver wants 9 volts. As far as I can tell
it draws 25 mA at that voltage. I hooked it up
to the solar cells that are delivering 12 volts.
My reasoning was that the 49 MHz receiver would
work fine at 12 volts but nothing happened.
I know the receiver was not damaged, because
after that try I put it back on a 9 volt battery
and it was fine. Perhaps at 12 volts, instead of
9, the current demand for the STL receiver is
more than the solar cells can provide.
So that’s where things are now.