NEGATIVE_TRIGGERING

Published:2009/7/10 5:54:00 Author:May | From:SeekIC

Standard transistor pump circuit is driven by differentiating and squaring circuit designed so each staircase block is triggered by negative edge rather than by pulse. Circuit was developed for FET curve tracer, and can be used in other applications where only resetting edge of normal sawtooth is available as trigger. R28 changes number of steps produced before staircase is reset. Tr6 is Texas Instruments 43, IC opamp is SN72741P, transistors are BC182L or equivalent, and diodes are 1S44.-L. G. Cuthbert, An F.E.T. Curve Tracer, Wireless World, April 1974, p 101-103.



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