SIMPLE_DAC

Published:2009/6/30 3:05:00 Author:May | From:SeekIC

Transistors are either saturated or cut off by outputs of clock-controlled SN7490 BCD counter, Portions of emitter voltages of the four transistors are added in ratios 1:2:4:8 by 741 summing opamp to obtain analog output. Article tells how two such circuits can be combined for use in two-digit DVM.—D. James, Simple Digital to Analogue Converter, Wireless World, June 1974, p 197.



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