The square wave generating circuit composed of LM139

Published:2011/6/14 21:02:00 Author:Borg | Keyword: square wave, circuit | From:SeekIC

In the figure is the square wave generating circuit. LM139 can be used in oscillating circuits of a few MHZ. This circuit is the square wave generating circuit which consists of few elements. The output frequency of the circuit is decided by the time parameters of R4 and C1, and it is also decided by the lag circuits of R1,R2 and R3. The maximum working frequency is limited by the lagged time of the comparator large signal transmission. Besides, the working frequency is relevant to the loading characteristics. When the circuit is capacitive load, its maximum working frequency is reduced. In the circuit, figure (a) is the single power supply circuit.



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