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Computer tuning of hybrid audio oscillators

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1 Author(s)
Hintzman, Frederick H. ; Western Electric Company

A hybrid tantalum thin-film and beam-lead silicon device will be incorporated in the Bell System's Touch-Tone telephones of the future. This RC multifrequency audio oscillator will replace the LC device presently used in the Touch-Tone keyboards. The tuning process for the RC device requires that the tantalum thin-film resistors be custom adjusted to calculated values; and a tuning system driven by a small process-control computer has been designed to fulfill this function.

Published in:

Spectrum, IEEE  (Volume:6 ,  Issue: 2 )