GB1077878A - Improvements in electronic trigger circuits - Google Patents

Improvements in electronic trigger circuits

Info

Publication number
GB1077878A
GB1077878A GB730765A GB730765A GB1077878A GB 1077878 A GB1077878 A GB 1077878A GB 730765 A GB730765 A GB 730765A GB 730765 A GB730765 A GB 730765A GB 1077878 A GB1077878 A GB 1077878A
Authority
GB
United Kingdom
Prior art keywords
circuit
stable circuit
voltage
stable
threshold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB730765A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jeumont Schneider SA
Original Assignee
Jeumont Schneider SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jeumont Schneider SA filed Critical Jeumont Schneider SA
Publication of GB1077878A publication Critical patent/GB1077878A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
    • H03K3/2893—Bistables with hysteresis, e.g. Schmitt trigger

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1,077,878. Detecting threshold level. SOCIETE DE CONSTRUCTIONS ELECTROMECANIQUES JEUMONT - SCHNEIDER. Feb. 19, 1965 [Feb. 25, 1964], No. 7307/65. Heading H3T. To determine if a variable D.C. voltage is above or below a given threshold value it is applied to a bi-stable circuit in conjunction with a pulsating voltage which goes outside the two levels at which the bi-stable circuit changes over; the output of the bi-stable circuit is passed to a further bi-stable circuit via a delay circuit of time-constant longer than one cycle of the pulsating voltage, so that the second bi-stable circuit changes over at a definite value of the variable voltage. If this definite value is to be the upper threshold of the first bi-stable circuit, the variable and pulsating voltages are applied via an AND circuit which passes on whichever instantaneous value is the lower. For use with the lower threshold an OR gate is used to pass on whichever instantaneous value is the higher. The time constant of the coupling circuit should be asymmetric, having a greater value for falling or rising voltages respectively, in these two modifications. Such asymmetry can be provided in the former case by the conduction or non-conduction of the output transistor of the first bi-stable circuit, and in the latter case by a parallel diode/resistor circuit in series with the lead from the first bi-stable circuit to the shunt capacitor that provides the delay. More than one input voltage can be present simultaneously. The bistable circuits are preferably transistor Schmitt trigger circuits. If necessary, the D.C. level of the input signal is shifted to bring it in the proper relationship to the threshold levels of the first bi-stable circuit.
GB730765A 1964-02-25 1965-02-19 Improvements in electronic trigger circuits Expired GB1077878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR964985A FR1394898A (en) 1964-02-25 1964-02-25 Advanced electronic scale

Publications (1)

Publication Number Publication Date
GB1077878A true GB1077878A (en) 1967-08-02

Family

ID=8823941

Family Applications (1)

Application Number Title Priority Date Filing Date
GB730765A Expired GB1077878A (en) 1964-02-25 1965-02-19 Improvements in electronic trigger circuits

Country Status (5)

Country Link
BE (1) BE659887A (en)
FR (1) FR1394898A (en)
GB (1) GB1077878A (en)
LU (1) LU48023A1 (en)
NL (1) NL6501809A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594588A (en) * 1969-04-01 1971-07-20 Motorola Inc Frequency detection system
GB2319916A (en) * 1996-11-27 1998-06-03 Sony Uk Ltd Failsafe digital audio data thresholder using a small auxiliary input signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594588A (en) * 1969-04-01 1971-07-20 Motorola Inc Frequency detection system
GB2319916A (en) * 1996-11-27 1998-06-03 Sony Uk Ltd Failsafe digital audio data thresholder using a small auxiliary input signal
US6002353A (en) * 1996-11-27 1999-12-14 Sony Corporation One-bit digital signal processing
GB2319916B (en) * 1996-11-27 2001-01-24 Sony Uk Ltd One-bit digital signal processing

Also Published As

Publication number Publication date
BE659887A (en) 1965-06-16
FR1394898A (en) 1965-04-09
LU48023A1 (en) 1965-04-20
NL6501809A (en) 1965-08-26

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