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GB1108599A - Improvements in or relating to electrical signal converters - Google Patents

Improvements in or relating to electrical signal converters

Info

Publication number
GB1108599A
GB1108599A GB14870/67A GB1487067A GB1108599A GB 1108599 A GB1108599 A GB 1108599A GB 14870/67 A GB14870/67 A GB 14870/67A GB 1487067 A GB1487067 A GB 1487067A GB 1108599 A GB1108599 A GB 1108599A
Authority
GB
United Kingdom
Prior art keywords
voltage
base
transistor
resistor
input
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
GB14870/67A
Inventor
Michael Gerstendorfer
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.)
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig 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 Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Publication of GB1108599A publication Critical patent/GB1108599A/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
    • H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
    • H03K3/351—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region the devices being unijunction transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Amplifiers (AREA)

Abstract

1,108,599. Pulse modulation circuits; unijunction transistor oscillators. GRUNDIG E.M.V. ELEKTRO-MECHANISCHE VERSUCHSANSTALT INH. MAX GRUNDIG. 31 March, 1967 [31 March, 1966], No. 14870/67. Headings H3T and H4L. In a circuit for converting a voltage change into a corresponding change in frequency of an output signal, the incoming signal U E is supplied to a differential amplifier DV whose output is supplied to the base of a transistor T2 so that a capacitor C is charged via T2 and resistor RE and discharged via a unijunction transistor T1. The voltage across resistor R E provides the other input to amplifier DV. By this means the voltage across RE is maintained equal to the input voltage causing the charging current and therefore the output frequency to be proportional to the input voltage. Alternatively to obtain greater input sensitivity the voltage may be fed back from a tap on resistor RE. The discharge time EB of the capacitor, Fig. 1, introduces an error which is greater the higher the frequency and to minimize this error it is arranged that charging is terminated at point U p 2 instead of U p 1 so that the total period extends from A to E instead of from A to B and the discharge time is effectively eliminated. This is achieved by connecting the base B2 of the unijunction transistor to an adjustable tap on the emitter resistor R R of a transistor T3 whose base is connected to the base of transistor T2, the value of the base-to-base voltage of transistor T1 being set by adjustment of R R so that the peak-point voltage drops to the value V p 2. A thermistor R H in the base B1 circuit of the unijunction transistor compensates for temperature variations.
GB14870/67A 1966-03-31 1967-03-31 Improvements in or relating to electrical signal converters Expired GB1108599A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEG46511A DE1275107B (en) 1966-03-31 1966-03-31 Circuit arrangement for converting a voltage into a frequency with a recharging capacitor

Publications (1)

Publication Number Publication Date
GB1108599A true GB1108599A (en) 1968-04-03

Family

ID=7128068

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14870/67A Expired GB1108599A (en) 1966-03-31 1967-03-31 Improvements in or relating to electrical signal converters

Country Status (4)

Country Link
AT (1) AT262373B (en)
CH (1) CH451241A (en)
DE (1) DE1275107B (en)
GB (1) GB1108599A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4724043U (en) * 1971-04-07 1972-11-17
JPS49843U (en) * 1972-04-05 1974-01-07

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4724043U (en) * 1971-04-07 1972-11-17
JPS49843U (en) * 1972-04-05 1974-01-07

Also Published As

Publication number Publication date
AT262373B (en) 1968-06-10
CH451241A (en) 1968-05-15
DE1275107B (en) 1968-08-14

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