LM3900_AS_MONO

Published:2009/7/2 0:35:00 Author:May | From:SeekIC

R4 holds output high normally, so C1 is charged almost to V+ level through D1. Negative input trigger forces output of current-differencing amplifier low, and C1 discharges through R1. When decreasing current through R2 approaches current in R3 (when voltage across C1 is about one-third of V+), output switches to high and returns circuit to standby state. Pulse width, equal to 1.1R1C1, can be programmed easily by using pot or some form of manual or electronic switching for R1 .-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 510-512.



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