GB885463A - Improvements in or relating to multivibrators - Google Patents

Improvements in or relating to multivibrators

Info

Publication number
GB885463A
GB885463A GB5709/58A GB570958A GB885463A GB 885463 A GB885463 A GB 885463A GB 5709/58 A GB5709/58 A GB 5709/58A GB 570958 A GB570958 A GB 570958A GB 885463 A GB885463 A GB 885463A
Authority
GB
United Kingdom
Prior art keywords
capacitor
valve
cut
screen
discharge
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
GB5709/58A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB885463A publication Critical patent/GB885463A/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
    • H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
    • H03K3/05—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using means other than a transformer for feedback
    • H03K3/06—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using means other than a transformer for feedback using at least two tubes so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/08—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using means other than a transformer for feedback using at least two tubes so coupled that the input of one is derived from the output of another, e.g. multivibrator astable

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Feedback Control In General (AREA)

Abstract

885,463. Valve pulse generating circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. Feb. 21, 1958 [Feb. 25, 1957], No. 5709/58. Class 40(6). A multivibrator is made less sensitive to changes in valve parameters by the use of at least one pentode, the screen circuit of which comprises a resistor and capacitor of suitable time constant so that the screen voltage rises appreciably when the valve is cut off and falls when conductive. In the freerunning multivibrator shown, the duration of the longest half cycle (when valve 20 is cut off) is determined by the discharge of capacitor C via resistor R. The screen voltage rises due to the discharge of capacitor 24 when valve 20 is cut off. This causes the cut off voltage to rise so that the discharge curve of capacitor C passes through the cut off voltage curve substantially at right angles. The pulse duration and frequency are hence less dependent on valve changes. A theoretical explanation is given. Capacitor 28 is used for decoupling. Fig. 5 (not shown) relates to a similar circuit comprising two pentodes, both having the screen voltage controlled by the charge and discharge of a capacitor between screen and earth.
GB5709/58A 1957-02-25 1958-02-21 Improvements in or relating to multivibrators Expired GB885463A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1167222T 1957-02-25

Publications (1)

Publication Number Publication Date
GB885463A true GB885463A (en) 1961-12-28

Family

ID=9655453

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5709/58A Expired GB885463A (en) 1957-02-25 1958-02-21 Improvements in or relating to multivibrators

Country Status (3)

Country Link
BE (1) BE565111A (en)
FR (1) FR1167222A (en)
GB (1) GB885463A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3246247A1 (en) * 1982-12-14 1984-06-14 Siemens AG, 1000 Berlin und 8000 München DOUBLE-WALLED, FLEXIBLE HOSE

Also Published As

Publication number Publication date
BE565111A (en)
FR1167222A (en) 1958-11-21

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