Digital indication for selectable impedance circuit

Communications: electrical – Audible indication – Percussion-type sound producer

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324 98, 324DIG1, 340347M, H03K 1303

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active

040913813

ABSTRACT:
A digital indication for a selectable impedance circuit consisting of a plurality of serially connected impedances and a selector which is connectable to a common junction of any of them is provided by connecting an electric signal source to the end terminals of the circuit to develop a signal between the selector and at least one of the end terminals which is compared with the output of a digital/analog converter, the converter being connected to the output of a digital counter which continues to receive clock pulses until disabled from doing so by a comparison difference within a predetermined tolerance.

REFERENCES:
patent: 3711850 (1973-01-01), Kelly
patent: 3713136 (1973-01-01), Nagy
patent: 3728626 (1973-04-01), Douglas et al.
patent: 3982241 (1976-09-01), Lipcon
Motorola Semiconductors' Specifications and Applications Information, MC1507L, pp. 1, 10 & 11.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. III-1 to III-18.

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