X-Message-Number: 7528
From:  (Randy)
Subject: Re: 'Member-down" alert systems
Date: Sat, 18 Jan 1997 05:38:55 GMT

Here's a crude prototype of such adevice which would detect
(hopefully) lack of motion:

The device would be strapped to the forearm or ankle. The electronics
would consist of a "howler" audio circuit set up to go off when a
transistor biasing circuit containing a resistive-capacitve circuit
with a long (1-6 hours?) time constant. When the RC biasing circuit
charges fully, the transistor sets off the audio alarm which outputs
through a small speaker on the device. The resistor would have to be
adjustable so that the time constant could be varied to fit the motion
frequency of the sleeping cryonicist.
The motion (or lack of same) by the cryonicist is translated by two
small diameter SS ball bearings located in two separate closed
cylinders located on the device. At both ends of both cylinders are 2
conductors which effectively ground (and thereby discharge) the RC
biasing circuit when the stainless steel ball bearing contacts the
conductors. Thus the alarm will not go off if the cryonicist does move
before the time contant elapses. Once the biasing circuit does
discharge, there needs to be some way to reset the circuit by
insulating the circuit once more so that a charge can build up once
more. When the wearer moves next time the ball bearing rolls to the
other side. The cylinders will be at right angles to each other, the
better to translate motion.

The audio from the speaker is picked up by a mike which feeds a audio
amp that filters out all else but this particular  frequency. The
output of the audio amp, after a suitable time delay to allow for
false alarms, activates an autodialer (how, I don't know).

In order to make sure that the speakers are not smothered by the body
of the wearer, there should be 2 devices, one worn on each wrist.

Randy               =20
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