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GB1395899A - Square wave generators with variable frequency output - Google Patents

Square wave generators with variable frequency output

Info

Publication number
GB1395899A
GB1395899A GB4763471A GB4763471A GB1395899A GB 1395899 A GB1395899 A GB 1395899A GB 4763471 A GB4763471 A GB 4763471A GB 4763471 A GB4763471 A GB 4763471A GB 1395899 A GB1395899 A GB 1395899A
Authority
GB
United Kingdom
Prior art keywords
variable frequency
counter
switches
square wave
decrementing
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
GB4763471A
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.)
British Hovercraft Corp Ltd
Original Assignee
British Hovercraft Corp Ltd
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 British Hovercraft Corp Ltd filed Critical British Hovercraft Corp Ltd
Priority to GB4763471A priority Critical patent/GB1395899A/en
Priority to DE19722240414 priority patent/DE2240414A1/en
Priority to FR7232079A priority patent/FR2157323A5/fr
Priority to CA151,536A priority patent/CA966558A/en
Priority to JP10199372A priority patent/JPS4847750A/ja
Publication of GB1395899A publication Critical patent/GB1395899A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
    • H03B21/01—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies
    • H03B21/02—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies by plural beating, i.e. for frequency synthesis ; Beating in combination with multiplication or division of frequency
    • H03B21/025—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies by plural beating, i.e. for frequency synthesis ; Beating in combination with multiplication or division of frequency by repeated mixing in combination with division of frequency only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/64—Generators producing trains of pulses, i.e. finite sequences of pulses
    • H03K3/72—Generators producing trains of pulses, i.e. finite sequences of pulses with means for varying repetition rate of trains

Landscapes

  • Manipulation Of Pulses (AREA)
  • Control Of Stepping Motors (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

1395899 Variable frequency dividers BRITISH HOVERCRAFT CORP Ltd 17 Aug 1972 [13 Oct 1971] 47634/71 Headings G4D and G4A [Also in Division H2] A square wave of variable frequency is gene- rated using a fixed frequency oscillator 14 and a variable frequency divider comprising a B.C.D. counter 11, a decoder 17, a set of selector switches 21 which can be set to identify any particular count and logic gates 15, 16, 19, 20, 22, 23, 24 arranged to switch the counter from incrementing to decrementing when the accumulated count reaches that identified by the switches and from decrementing to incrementing when the count reaches zero, a bi-stable 26 changing state each time the counter is switched. The output from bi-stable 26 feeds another bistable 27 which with gates 28-31 generates the four phased inputs to a D.C.-A.C. converter (not shown) which feeds a 115 VAC two phase synchronous motor, e.g. driving a pen recorder, whose speed can thus be set by the switches 21.
GB4763471A 1971-10-13 1971-10-13 Square wave generators with variable frequency output Expired GB1395899A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB4763471A GB1395899A (en) 1971-10-13 1971-10-13 Square wave generators with variable frequency output
DE19722240414 DE2240414A1 (en) 1971-10-13 1972-08-17 SQUARE WAVE GENERATOR WITH VARIABLE FREQUENCY OUTPUT
FR7232079A FR2157323A5 (en) 1971-10-13 1972-09-11
CA151,536A CA966558A (en) 1971-10-13 1972-09-12 Square wave generators with variable frequency output
JP10199372A JPS4847750A (en) 1971-10-13 1972-10-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4763471A GB1395899A (en) 1971-10-13 1971-10-13 Square wave generators with variable frequency output

Publications (1)

Publication Number Publication Date
GB1395899A true GB1395899A (en) 1975-05-29

Family

ID=10445715

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4763471A Expired GB1395899A (en) 1971-10-13 1971-10-13 Square wave generators with variable frequency output

Country Status (5)

Country Link
JP (1) JPS4847750A (en)
CA (1) CA966558A (en)
DE (1) DE2240414A1 (en)
FR (1) FR2157323A5 (en)
GB (1) GB1395899A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516688A1 (en) * 1981-11-16 1983-05-20 Int Standard Electric Corp FLEXIBLE DISC DRIVE MECHANISM USING A SYNCHRONOUS MOTOR WITH DIRECT CURRENT POWER SUPPLY
GB2132838A (en) * 1982-12-15 1984-07-11 Griffiths Mavis Synchronous electric motor control

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109030927A (en) * 2018-06-28 2018-12-18 常州机电职业技术学院 Multi-path voltage inspection circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516688A1 (en) * 1981-11-16 1983-05-20 Int Standard Electric Corp FLEXIBLE DISC DRIVE MECHANISM USING A SYNCHRONOUS MOTOR WITH DIRECT CURRENT POWER SUPPLY
GB2132838A (en) * 1982-12-15 1984-07-11 Griffiths Mavis Synchronous electric motor control

Also Published As

Publication number Publication date
FR2157323A5 (en) 1973-06-01
CA966558A (en) 1975-04-22
JPS4847750A (en) 1973-07-06
DE2240414A1 (en) 1973-05-03

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees