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From: jdk@psivax.UUCP (Jeff Konopka)
Newsgroups: net.analog,net.bio,net.med
Subject: Re: electrocardiograph
Message-ID: <1417@psivax.UUCP>
Date: Wed, 3-Sep-86 16:28:36 EDT
Article-I.D.: psivax.1417
Posted: Wed Sep  3 16:28:36 1986
Date-Received: Thu, 4-Sep-86 20:12:05 EDT
References: <527@vaxwaller.UUCP>
Reply-To: jdk@psivax.UUCP (Jeff Konopka)
Distribution: net
Organization: Pacesetter Systems Inc., Sylmar, CA
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Xref: mnetor net.analog:851 net.bio:475 net.med:3286

In article <527@vaxwaller.UUCP> rogert@vaxwaller.UUCP (Roger Tong) writes:
>Can anyone point me to some references on amplifiers and associated
>circuitry that will allow me to monitor pulse rate? if there exists
>any off the shelf items that can do this, all the better.
>

The Burr-Brown catalog has some suggestions of how to build EKG amplifiers.
The biggest problem you will encounter will be 60Hz noise.
You are looking for 2mV p-p signals.

                   but....

If you are going to build your own circuit to display your EKG,
be careful that your circuit is
		FULLY ISOLATED
so that you don't go hooking yourself up to a hot 110V line.
Use of batteries will not guarantee isolation from a ground fault if you
interface directly to a CRT or a scope or  any other device that gets its
power from the line. Use an isolation amplifier or an optoisolator, and
use a DC/DC converter if you plan to power the amplifier from a line powered
power supply.

If however you are simply looking for something that monitors just heart
rate, those are comercially available from Sears.

                Jeff Konopka
           Pacesetter Systems Inc.
        {sdcrdcf|ihnp4}! psivax!jdk