The oscillating circuit with the output of sine and square waves(LM111 and LM101A)

Published:2011/6/14 2:08:00 Author:Borg | Keyword: oscillating circuit, sine and square waves | From:SeekIC

In ordinary RC oscillating circuits, if we want a wide frequency changing range, we not only need to change the resistor, but also need to change the capacitor. However, this circuit only needs a resistor R3 to do this. In the figure, the computing amplifier LM101A forms a band-pass filter, LM111 is a LEV comparator which forms a amplitude limiter. Because of the forward and backward feedbacks, an oscillation is generated between them. The LEV comparator outputs a sine wave, but the filter only picks out the basic wave, so that LM101A outputs a sine wave.



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