Browse Prior Art Database

Multivibrators

IP.com Disclosure Number: IPCOM000095657D
Original Publication Date: 1964-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Truslove, DJ: AUTHOR

Abstract

Each side of a long-period multivibrator has an odd number of grounded emitter transistor stages. A long periodic time is achieved by making the value of resistors R1 high, e.g., between 1M omega and 10M omega. Thus, the value of capacitors C1 can be kept relatively low, e.g., of the order of 1 mu F per second of the output signals. The values of the collector load resistors R2, R3 and R4 successively decrease. Resistors R4 have a relatively low value to enable output currents of the order of 20mA to be taken from output terminals 1 and 2.

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Multivibrators

Each side of a long-period multivibrator has an odd number of grounded emitter transistor stages. A long periodic time is achieved by making the value of resistors R1 high, e.g., between 1M omega and 10M omega. Thus, the value of capacitors C1 can be kept relatively low, e.g., of the order of 1 mu F per second of the output signals. The values of the collector load resistors R2, R3 and R4 successively decrease. Resistors R4 have a relatively low value to enable output currents of the order of 20mA to be taken from output terminals 1 and 2.

Astable multivibrators of this type can have three or five transistors on each side to provide symmetrical output signals. Also, they can have different numbers on the sides, i.e., one on one side and three on the other, to provide non- symmetrical output signals.

A monostable multivibrator, similar to these astable multivibrators, comprises three or five transistors on one side and a single transistor, arranged to receive its input through a resistive, instead of a capacitive, coupling, on the other side.

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