[aprssig] BOUY 4
noskosteve at yahoo.com
Thu Aug 7 02:18:58 EDT 2008
Lot'sa ways to do it, but I dunno' Sounds like un-needed complexity and parts. While I like electronics... I still like A reed-magnet in series with the battery and that's it. No idle current. Magnet in a plastic tube slides to the reed when the buoy is upright. Tube can come from an old pen or a spray bottle pickup.
Fun to speculate.
73, Steve, K9DCI
--- On Wed, 8/6/08, Greg D. <ko6th_greg at hotmail.com> wrote:
> From: Greg D. <ko6th_greg at hotmail.com>
> Subject: RE: [aprssig] BOUY 4
> To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>, noskosteve at yahoo.com
> Date: Wednesday, August 6, 2008, 11:42 PM
> But how would you know for sure which way the latch was set?
> Why not just have a reed switch remove the bias on a power
> FET (short gate to ground)? Or even better, have it drive a
> CMOS inverter to drive the power FET, wired so that the
> no-magnet state turns on the power, and the magnet state
> turns it off? With a such a high impedance input on the
> inverter, the magnet state would be drawing a few microamps
> at most through the voltage divider, and the rest of the
> logic is essentially inert with no clock running. You
> don't need to turn off absolutely everything, you just
> need to make the off-state current draw low enough to be
> Just make sure the magnet comes off before launch. Maybe
> stick it on with water soluble glue?
> Greg KO6TH
> > Date: Wed, 6 Aug 2008 13:34:11 -0500
> > From: kg4wsv at gmail.com
> > To: noskosteve at yahoo.com; aprssig at lists.tapr.org
> > Subject: Re: [aprssig] BOUY 4
> > I'd use something like the magnet + reed switch
> (in conjunction with
> > a latching circuit, so the need for the magnet is
> temporary) to turn
> > _on_ power, and use an APRS command to a Tracker2 to
> turn off power.
> > -Jason
> > kg4wsv
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