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Browse Prior Art Database

Noise Protected Monostable Multivibrator

IP.com Disclosure Number: IPCOM000092218D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Boggs, BR: AUTHOR

Abstract

Diode 10 is incorporated in a conventional monostable multivibrator circuit to prevent noise in the power supply from causing erroneous output pulses. Transistor 11 is off and transistor 12 is conducting when the circuit is in its quiescent state. An input pulse is applied to transistor 11 to cause it to conduct and transistor 12 to become nonconductive for a period determined by the time constant of a circuit comprising capacitor 13. Diode 10 prevents negative voltage noise at power supply terminal 14 from diverting the base current of transistor 12 into charging of capacitor 13. Since charging current for capacitor 13 cannot flow, transistor 12 remains conductive and erroneous output signals are eliminated.

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Noise Protected Monostable Multivibrator

Diode 10 is incorporated in a conventional monostable multivibrator circuit to prevent noise in the power supply from causing erroneous output pulses. Transistor 11 is off and transistor 12 is conducting when the circuit is in its quiescent state. An input pulse is applied to transistor 11 to cause it to conduct and transistor 12 to become nonconductive for a period determined by the time constant of a circuit comprising capacitor 13. Diode 10 prevents negative voltage noise at power supply terminal 14 from diverting the base current of transistor 12 into charging of capacitor 13. Since charging current for capacitor 13 cannot flow, transistor 12 remains conductive and erroneous output signals are eliminated.

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