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Low Energy Monostable Multivibrator

IP.com Disclosure Number: IPCOM000090993D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Dyar, JR: AUTHOR

Abstract

The monostable multivibrator utilizes zero standby power and has no emitter-base protection diode. A ground level pulse, applied at terminal A, drives transistor T1 to saturation which effects saturation of transistor T2 through resistors R1 and R2. Capacitor C1 charges through the collector of saturated T2. T1 and T2 remain saturated until C1 charges sufficiently to limit the current through resistors R3 and R4, thus cutting off T1 and hence T2. Pulse width is determined chiefly by the values of R3, R4, and C1 and also the effective input impedance of T1. The recovery rate is determined by the values of R3, R4, C1, and L. A positive pulse applied at point B turns on T2 to ground C1 which turns T1 on.

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Low Energy Monostable Multivibrator

The monostable multivibrator utilizes zero standby power and has no emitter-base protection diode. A ground level pulse, applied at terminal A, drives transistor T1 to saturation which effects saturation of transistor T2 through resistors R1 and R2. Capacitor C1 charges through the collector of saturated T2. T1 and T2 remain saturated until C1 charges sufficiently to limit the current through resistors R3 and R4, thus cutting off T1 and hence T2. Pulse width is determined chiefly by the values of R3, R4, and C1 and also the effective input impedance of T1. The recovery rate is determined by the values of R3, R4, C1, and L. A positive pulse applied at point B turns on T2 to ground C1 which turns T1 on. Either capacitor C2 or capacitor C3 or both serve to couple the triggering pulse to the circuit while resistors R5 and R6 discharge C3 and C2. The utilization of the conjugate pair T1 and T2 prevents current drain when the device is off.

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