GB1327548A - Threshold voltage amplifier - Google Patents

Threshold voltage amplifier

Info

Publication number
GB1327548A
GB1327548A GB383072A GB383072A GB1327548A GB 1327548 A GB1327548 A GB 1327548A GB 383072 A GB383072 A GB 383072A GB 383072 A GB383072 A GB 383072A GB 1327548 A GB1327548 A GB 1327548A
Authority
GB
United Kingdom
Prior art keywords
transistor
voltage
jan
base
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
GB383072A
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.)
Metrawatt GmbH
Original Assignee
Metrawatt GmbH
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 Metrawatt GmbH filed Critical Metrawatt GmbH
Publication of GB1327548A publication Critical patent/GB1327548A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching

Landscapes

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

Abstract

1327548 Transistor switching circuits METRAWATT GmbH 27 Jan 1972 [27 Jan 1971] 3830/72 Heading H3T [Also in Division H2] A circuit for monitoring a reversable direct voltage and producing an output when a predetermined threshold is exceeded comprises: an input resistance R M across which the voltage is developed; a first transistor T1 with its emitter connected to one end of R M and its base connected to the other; a second transistor T2 with its base connected to the one end of R M and its emitter connected to the other; and a resistive load circuit R a connected from the collectors to a supply source V. As used in a measuring instrument, an excessive measured voltage of either polarity causes either T1 or T2 to conduct and produce, across Ra, a voltage which after amplification actuates a relay S to disconnect the supply to R M . In a modification, Fig. 2 (not shown), the transistors T1, T2 have separate load resistors which are individually coupled to the relay operating transistor (T8). The threshold may be modified by including threshold elements such as Zener diodes in the base leads of T1, T2.
GB383072A 1971-01-27 1972-01-27 Threshold voltage amplifier Expired GB1327548A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712103726 DE2103726C3 (en) 1971-01-27 1971-01-27 Threshold voltage amplifier for monitoring DC voltages of alternating polarity

Publications (1)

Publication Number Publication Date
GB1327548A true GB1327548A (en) 1973-08-22

Family

ID=5797029

Family Applications (1)

Application Number Title Priority Date Filing Date
GB383072A Expired GB1327548A (en) 1971-01-27 1972-01-27 Threshold voltage amplifier

Country Status (4)

Country Link
AT (1) AT320078B (en)
DE (1) DE2103726C3 (en)
FR (1) FR2124708A5 (en)
GB (1) GB1327548A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731848C2 (en) * 1977-07-14 1985-06-20 Metrawatt GmbH, 8500 Nürnberg Protection circuit for battery-powered measuring devices

Also Published As

Publication number Publication date
DE2103726C3 (en) 1974-02-07
DE2103726B2 (en) 1973-07-12
DE2103726A1 (en) 1972-08-10
FR2124708A5 (en) 1972-09-22
AT320078B (en) 1975-01-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee