-------------- Original message from Bob White <rlwhite@comcast.net>: --------------


> On Sat, 25 Feb 2006 07:04:37 -0500
> Chad Robinson wrote:
>
> > Tracy Hallock wrote:
> > >
> > > After seeing Mark's demonstration, I was pretty impressed, so I did a
> > > search on the internet for similar products. The link below looked
> > > promising:
> > >
> > > http://www.georgejenson.com/rv7.php
> > >
> > > They include a board and the detector for $72. Unfortunately, I am too
> > > far off from needing this yet, but someone else might like to experiment.
> >
> > Tracy, did you mean to include this link as opposed to the one above?
> > http://www.acroname.com/robotics/parts/R67-UVTRON.html
> >
> > This is a good way to go if you're serious about using this detector. It runs
> > on 10-30VDC, and you can get a project box from Radio Shack for a few bucks
> > that will fit it.
> >
> > Note that if you want to use this, you will need some way to indicate its
> > output. A good way would be a 12V relay, light, and buzzer, also from Radio
> > Shack. You'd hook the relay to "output pin 3 - Open Collector Output", and use
> > it to drive the indicator light (or LED) and the buzzer. Make sure the coil
> > rating of the relay you get doesn't exceed 100mA at 12V (coil resistance 120
> > ohms max).
>
>
> *** Make that 120 ohms MIN. More ohms, less current. :)
>
> Bob W.
>

> >
> > Finally, the output of this thing is a very short pulse. The spec sheet for
> > the driver circuit says you can add a capacitor at a spot on the circuit
> > board. Again, Radio Shack sells capacitors. A 1uF value across the Cx
> > terminals will make the output pulse for 1 second at a time. Don't forget to
> > jumper the "background cancel level" terminals, too. Looks like you'd want to
> > use position 3 - they label this "general use". You can experiment with a
> > different slot if it's falsely triggering.
> >
> > Sounds like a lot of hookup work, but you could probably do it (minus wiring
> > and installing it) in 20 minutes. I'm just trying to be detailed. =)
> >
>
>
> http://www.bob-white.com
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