The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: John Fields
Organization: Austin Instruments,Inc.
X-Mailer: Mozilla 4.01 [en] (Win95; U)
Subject: Re: Current sensor circuit
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: Tue, 03 Sep 2002 10:15:20 CDT
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
Date: Tue, 03 Sep 2002 15:15:20 GMT
Tom Blough wrote:
> Mark and others,
> I had some time this weekend to measure the currents in question WRT this
> The antenna up signal (+12V) draws 1.00mA when the antenna is raising and
> 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. :-)
Professional circuit designer
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup