Re: code light signalss

On Sun, 13 Jan 2008 23:35:19 -0500, Spehro Pefhany wrote:
On Mon, 14 Jan 2008 04:26:13 GMT, the renowned ehsjr
emprosania@xxxxxxxxx wrote:
Where can I get a circuit design to make a circuit to light two mini-
incandescent bulbs on my radio-controlled air craft carrier's topmast
signal lights to send the message,"Where is the sixth fleet". Power
source is two "D" cells.Size and should be minimum.

In addition to the other ideas already mentioned:
You could use the output from a Radio Shack recording
module (# 276-1323) to drive a mosfet or bipolar to
flash the lights. You'd need to record the morse at
about 15 wpm for the message to fit - the module stores
20 seconds of sound. The playback would be at the
same speed. You would need to provide 9 volts for this.

A memory keyer gives you more message room and control
over the playback speed, but costs more. A micro gives
you ultimate control, and is cheaper - but you have to
know how to program and use it.

With all three ideas, you need to use a mosfet or bipolar
to flash the lights. The lights take more current than
the module, keyer, or micro can supply directly. And you
need to provide the proper voltage to whichever device
you use.

Actually, a PIC operating from 3V *can* drive grain-of-wheat
incandescent lamps directly, with a series resistor to drop the
voltage.

If you're using incandescents, you might want to put a medium-
value resistor across the switch, to keep the filament warm,
but not lit up; this will increase bulb life dramatically and
maybe help with the switching edges.

Cheers!
Rich

.

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