MONOSTABLE_MULTIVIBRATOR

Published:2009/7/7 1:21:00 Author:May | From:SeekIC

The circuit illustrates the usefulness of the HA-5151 as a battery-powered monostable. In this cir-cuit, the ratio is set to.632, which allows the time constant equation to be reduced to:T = RtCtD2 is used to force the output to a defined state by clamping the negative input at +0.6 V. Trigger-ing is set by C1, R3, and D2. An applied trigger pulls the positive input below the clamp voltage, +0.6 V, which causes the output to change state. This state is held because the negative input cannot follow the change because of Rt· Ct. This particu-lar circuit has an output pulse width set at approxi-mately 100 μs. Use of potentiometers for Rt and variable capacitors for Ct will allow for a wide variation in T.



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