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From: "Tom Blough"
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3D74D34F.40F6438@texas.net>
Subject: Re: Current sensor circuit
Date: Tue, 3 Sep 2002 11:58:23 -0400
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Will 24AWG wire handle the 1.3 amps the radio draws when on-mic?
"John Fields" wrote in message
> Tom Blough wrote:
> > Mark and others,
> > I had some time this weekend to measure the currents in question WRT
> > circuit.
> > The antenna up signal (+12V) draws 1.00mA when the antenna is raising
> > raises to 1.25mA when the antenna is fully up.
> > The CB draws 116mA when idle at full volume and 1.3A when transmitting.
> If you used a Toko R1-23AAA reed switch and wound 160 turns of #24AWG
> magnet wire around it you'd wind up with a current sensor which would
> come on and drop about 27 millivolts with the CB on and idling and drop
> about 234 millivolts when the CB was transmitting. Put the coil in
> series with the CB's power input lead and use the switch contacts and a
> diode to send +12V to the antenna and isolate it from the stereo, and
> you've got the whole thing done for about a dollar! Make a little
> bobbin about an inch long and about an eighth of an inch OD and you can
> wind the 160 turns in four layers if you're careful. Even if you
> scramble wind it and it takes extra wire, you'll still have just about
> the simplest, most reliable sensor you can get. If you don't want to do
> it send me ten bucks and I'll build it for you. :-)
> John Fields
> Professional circuit designer
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