1_Hz_TO_100kHz_SQUARE_TRAINGLE

Published:2009/7/7 2:04:00 Author:May | From:SeekIC

Wid el range function generator built around LM111 comparator provides two different output waveforms whose frequency can be varied over five decades by R,, from 1 Hz to 100 kHz. Two transistor pairs are used to vary charging current of timing capacitor exponentially. Output current fromtransistor pairs is controlled by linear pot, so rotation of pot is proportional to log of output frequency. Sensistor R2 provides temperature compensation for transistor pairs.-R.C. Dobkin, Comparators Can Do More Than Just Compare, EDN Magazine, Nov. 1,1972, p 34-37.



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