A Micropower, Multichannel Biotelemetry System

Abstract

In order to gather biodata in the home environment, we have developed a compact and inexpensive FM multichannel subcarrier system employing micropower integrated circuits of the unique lateral PNP design. The subcarrier system may be used with or without a wireless transmitter. One FM transmitter design that has been used is presented. Components for four channels are mounted on a glass epoxy circuit board. More channels may be added and the potential for hybrid film packaging was considered in the design. Standard IRIG 7.5% proportional subcarrier frequencies from 400 Hz (ch. 1) to 3000 Hz (ch. 8) may be used with the center frequency being determined by the value of a single component in the oscillator circuit. The overall simplicity, stability, fidelity, and low power requirements of this subcarrier system facilitate long term unattended recording.

Development of an inexpensive remote radio control system for slide projection

“…This is not only true for those public speakers and presentors on the podium, but also for many of the behavioral researchers (Humphries, Phoebus, & Globus, 1974;Mackay, 1970). The system described here will free the speaker or operator from locational restraints and allow him to move freely or to perform necessary covert operations remotely.…”