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 *********************************** Cryonics: Your Gateway to the Future? Check out CryoCare at http://www.cryocare.org/cryocare/ 1-800-TOP-CARE Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=7528