[HQRP] Fwd: Re: 12v Battery Monitor circuit

[Ed Manuel]

Gang,

Steve "melt-solder" does it again.  A cute, simple battery voltage monitor.

Ed



>Delivered-To: directvinternet.com%edmanuel@directvinternet.com
>X-Received: 25 Jul 2002 21:02:44 GMT
>Date:   Thu, 25 Jul 2002 16:59:30 -0400
>Reply-To: kd1jv@moose.ncia.net
>Sender: owner-qrp-l@Lehigh.EDU
>From: Steven Weber <kd1jv@moose.ncia.net>
>To: "Low Power Amateur Radio Discussion" <qrp-l@Lehigh.EDU>
>Subject: Re: 12v Battery Monitor circuit
>X-To:   Paul.G.Kaczmarek@usa.dupont.com
>X-Cc:   qrp-l@lehigh.edu
>X-Sender: kd1jv@mailhost.ncia.net
>X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32)
>
>Okay, I came up with a simple battery monitoring circuit, which meets Pauls
>spec's, more or less.
>
>It came out a lot simpler than I had though at first. I took a run to Radio
>Shack to buy a bi-color LED and found it was two diodes in one package,
>with a common cathode. So, the circuit ened up just needing a single dual
>op amp and a voltage reference (78L05) Basicly, when the voltage is above
>11.9V, just the green led is on. Below 11.9 volts, the red led turns on,
>giving a yellowish color. Below 11.5 volts, the green led turns off and
>only the red led is on.
>
>Here's the link to the web page:
>
>http://www.qsl.net/kd1jv/batmon.HTM
>
>
>
>72,
>Steve, KD1JV
>"Melt Solder"
>White Mountains of New Hampshire
>http://www.qsl.net/kd1jv/


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