Re: DCC occupancy detections false positives

Ian Jackson wrote:
In article <RM%_j.2307$jI5.1457@xxxxxxxxxxxxxxxxxxxx>,
Rick Jones <r.t.jones@xxxxxxxxxxxxxxxxxxx> wrote:
Ian Jackson wrote:
Well, not in dollars, but my circuit (see my previous posting) can
be made as cheaply as this:
....
which is a little under $1.
I'm afraid I was unable to make heads or tails of the attempt at an ASCII schematic. Could you perhaps draw up a version in Paint that could be posted somewhere?

Did you look at the schematic in a fixed width font ?
I can't be bothered to draw another diagram but here's a screenshot of
what it looked like for me:
http://www.chiark.greenend.org.uk/~ijackson/2008/block-detection.png

The four ordinary diodes on the left are most easily found together in
a bridge rectifier: short out the rectifier's `+' and `-' terminals
and connect the two `~' terminals to booster output and track. (This
ties the two inter-diode midpoints together, which is not a problem.)

The thing with a diode, a little arrow, and part of a transistor is
the optocoupler. The rectangular boxes are the resistors.

I do have a more useful schematic at home that I could take a digital
photo of and put online if it would help.

OK, the diagram at that link looks better. I can make it out now. Thanks.

--

Rick Jones
Remove the Extra Dot to e-mail me

When dog food has "new and improved" taste, who tests it?
.

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