Circuit for producing direct voltages from pulses

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

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235 92TF, 325420, H03K 1302

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active

040878139

ABSTRACT:
A circuit, for producing direct voltages, for example the tuning voltages for a television or radio receiver, lying within a direct voltage range from pulses fed to an integrating circuit at whose output the direct voltages appear. A plurality of pulses (I) are fed to the integrating circuit, at whose output the direct voltage (U.sub.I) appears, within a period duration (T) assigned to the desired direct voltage range, with the period duration (T) being at least of the magnitude T = (U.sub.max - U.sub.min) .multidot..DELTA..tau./.DELTA.U.sub.I, where (U.sub.max - U.sub.min) is the desired direct voltage range, .DELTA..tau. is the shortest time duration of a pulse (I) and .DELTA.U.sub.I is the smallest voltage step width associated with the shortest pulse duration .DELTA..tau. by which two different direct voltages (U.sub.I) at least differ from one another.

REFERENCES:
patent: 3603977 (1971-09-01), Szabo et al.
patent: 3629710 (1971-12-01), Durland
patent: 3681707 (1972-08-01), Bean
patent: 3836908 (1974-09-01), Hegendorfer
patent: 3942171 (1976-03-01), Haraszti et al.
Reiner, MOS Integrated Digital-Analog Converter, Funk-Technik, No. 7, 1975, pp. 180-184.
Texas Instruments Deutschland GmbH Application Laboratory, The TTL-Cookbook, pp. 154-157 (date established) 5/10/1976.

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