piclist 1998\11\10\013618a >
Thread: Write voltage and MAX232
www.piclist.com/techref/power.htm?key=voltage
picon face BY : Peter L. Peres email (remove spam text)



On Mon, 9 Nov 1998, Dave VanHorn wrote:

> Danger! Will Robinson..
> I would want to look at that very carefully, the energy stored in that
> coil has to dump somewhere, and it dosen't sound like this is a good
> place.

The RA4 pin is Open Drain. It is also specced somewhere (I need to check)
to be raise-able to within 0.6V of Vpp or such. The Zener in parallel with
the pin to GND will limit any excursion up or down at the pin. The other
end of the coil was connected to a 4.8V NiCd pack with an internal R of
less than 0.2 ohms, bypassed by a large cap and by a reversing protection
5V6, plus an 800 mA slow blow fuse. I don't normally do stupid things.

Peter

<Pine.LNX.3.95.981109230708.888J-100000@plp4.plp.home.org>

In reply to: <3647581A.A1C43FE2@cedar.net>
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