US2572038A - Trigger circuits - Google Patents

Trigger circuits Download PDF

Info

Publication number
US2572038A
US2572038A US91104A US9110449A US2572038A US 2572038 A US2572038 A US 2572038A US 91104 A US91104 A US 91104A US 9110449 A US9110449 A US 9110449A US 2572038 A US2572038 A US 2572038A
Authority
US
United States
Prior art keywords
tube
circuit
anode
grid
potential
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 - Lifetime
Application number
US91104A
Other languages
English (en)
Inventor
Clifton B Kinne
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.)
Interchemical Corp
Original Assignee
Interchemical Corp
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
Priority to FR942908D priority Critical patent/FR942908A/fr
Application filed by Interchemical Corp filed Critical Interchemical Corp
Priority to US91104A priority patent/US2572038A/en
Application granted granted Critical
Publication of US2572038A publication Critical patent/US2572038A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/12—Shaping pulses by steepening leading or trailing edges
    • 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

Definitions

  • This invention relates to an improvedthermionic trigger arrangement and more particularly 1 Claim. (Cl. 250',27)
  • a new trigger circuit having two thermionic tubes connected asymmetrically with each other and comprising a third thermionic tube, whereby the output circuit is isolated from the input circuit and whereby an output of high amplitude isobtainable at anuncommonly low input amplitude difierential.
  • Thermi-onic trigger circuits of the past have been built according to the principle of the Eccles-J'ordanarrangement, as disclosed in British Patent 148,582, which is characterized mainly by a symmetric couplingof two thermionic tubes such as, for instance, from the anode of a first tube to the control grid of a second tube and from the anode of the second tube to the control grid of the first.
  • pentode trigger pairs are used for this purpose having the anode of the first tube connected to the screen grid of the second tube and'the anode of the second tube to the screen grid of the first.
  • one of the tubes becomes c-onducting.
  • Schmitt trigger circuit coupling is from the anode of a first tube to the control grid of a second tube and from the cathode of the second tube to the cathode of the first tube.
  • the thermionic trigger circuit of the present invention comprises numerous advantages not found in the aforementioned prior trigger arrangements. Thus, it provides for triggering in either direction from one state of equilibrium to another at a lower hysteresis of the input potential; The output circuit is almost completely iso1'ated"fro'm' the" input circuit whereby the output stability is greatly improved. A supply of negativevoltage.andthenecessity of using compensating condensers, is. entirely dispensed with. The circuit is. capable of operation at higher speedland-of yielding an output signal of. higher amplitude. In addition, the present trig.-
  • ger circuit. is superior in. being adjustable by means of asingle control and in being more simple inv construction.
  • the trigger circuit comprises threethermionic tubes, designated as IE 25, and 30.
  • the tube I0 is prefer-- ably a pentodealthoughthe. suppressor grid 12 of a pentode is not; an absolute requirement for the hereindisclcsed purpose.
  • the tubes are connectedv in such a manner that a conductor is provided between the anode I l of tube Ill and the control. grid 2-2 of tube. 20. Another conductor joins the anode. 2] of. tube 20 with the screen grid: [3. of tube. It ⁇ .
  • the tube 30' is made part of the trigger arrangement by connecting its cathode 33 toithe cathode 23 of tube 20 and connecting, both cathodes tola common cathode resistor '10; the other end. of. which is connected to a ground conductor M.
  • an output from anode 21 of tube 20 will yield an output in the same phase as the input.
  • Plate current is supplied from the source 43, the negative terminal of which is connected to the ground conductor 41, and is carried to the anodes of the respective tubes through conductors having the resistors 44, 45, and 46 inserted prior to the anodes.
  • Other resistors are the resistor 48 between the anode 2
  • the principle of the invention will be understood when reading in connection with the drawing the fo lowing description of what is believed to take place.
  • the circuit arrangement has two states of equilibrium. In the first state tube l0 i and tube 30 are passing very little anode current, while tube 20 is passing a large anode current. In the second state tube 20 is passing very little anode current, while tubes l0 and 30 are passing a large anode current.
  • the potential of the grid l4 with respect to the cathode l5 of tube I0 is more negative than the inferior critical voltage.
  • the potential of the grid l4 of tube It! increases until a superior critical potential is reached, at which potential the circuit regenerates. That is, the anode voltage of tube In in falling has reduced the grid voltage of tube 20,
  • the tube operates in phase with tube l0, because the common cathode resistor by means of which tube 30 is coupled with tube 20 causes the anode current of tube 30 to decrease whenever the anode current of tube 20 increases.
  • To obtain the largest possible output amplitude at low input differential is a matter of selecting the resistors 40, 44, 45, 46, 48 and 49 and adjusting the potentiometer 4
  • Tube I0 '6AK5 Tubes 20-1-30 6J6 Plate current supply 43 225 volts Cathode resistor 40 68,000 ohms Potentiometer 4i 50,000 ohms Resistor 44 10,000 ohms Resistor 45 2,500 ohms Resistor 46 5,000 ohm Resistor 48 0 Resistor 49 Infinite Resistor 50 10,000 ohms
  • the herein disclosed circuit has also been madeto operate very satisfactorily by using a 6AC7-' for tube [0 and GSN'? for tubes 20 and 30.
  • the potential of the grid 32 of tube 30 is adjusted to make the circuit trigger properly, it is evident that by a different adjustment of the potential of grid 32 the trigger circuit can be made inoperative. In many trigger circuit applications, such as counter circuits for instance, it is desirable to render the circuit inoperative for certain time intervals. This can be readily accomplished by coupling an external signal voltage onto the grid 32 to add or to subtract from the D. C. voltage as adjusted for proper triggering.
  • the new trigger arrangement is of enhanced usefulness in instances where the high speed switching action of a trigger circuit is desired, but compactness and simplicity are also required.
  • a thermionic trigger arrangement comprising three thermionic tubes, each having an anode, a cathode, and at least one control grid, the first of the said tube having in addition at least one auxiliary control grid, an input circuit connected between the cathode and the control grid of the said first tube, circuit means interconnecting the anode of the said first tube with the control grid of a second of the said three tubes and the anode of the said second tube with the auxiliary control grid of the said first tube, circuit means, including a common cathode resistor, interconnecting the cathode of the said second tube with the cathode of the third of the said three tubes, means to hold the control grid of the said third tube at a fixed potential, anode current supply means providing a large anode current in said second tube when the input potential drops below an inferior critical level until it passes a superior critical level, providing a large anode current in said first and third tube when the input potential passes the superior critical level until it falls below the inferior critical level, and an output

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)
  • X-Ray Techniques (AREA)
  • Microwave Tubes (AREA)
US91104A 1949-05-03 1949-05-03 Trigger circuits Expired - Lifetime US2572038A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR942908D FR942908A (fr) 1949-05-03 1946-11-21 Perfectionnements aux circuits de transmission
US91104A US2572038A (en) 1949-05-03 1949-05-03 Trigger circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US91104A US2572038A (en) 1949-05-03 1949-05-03 Trigger circuits

Publications (1)

Publication Number Publication Date
US2572038A true US2572038A (en) 1951-10-23

Family

ID=22226138

Family Applications (1)

Application Number Title Priority Date Filing Date
US91104A Expired - Lifetime US2572038A (en) 1949-05-03 1949-05-03 Trigger circuits

Country Status (2)

Country Link
US (1) US2572038A (fr)
FR (1) FR942908A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752490A (en) * 1950-10-02 1956-06-26 Rothstein Jerome Method of producing short pulses
US2784910A (en) * 1953-08-12 1957-03-12 Ghiorso Albert Pulse height analyzer
US2867721A (en) * 1953-03-27 1959-01-06 Delos B Churchill Regenerative phantastron time delay circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2338395A (en) * 1940-06-25 1944-01-04 Gen Electric Signal transmission system
US2442403A (en) * 1942-09-23 1948-06-01 Rca Corp Electronic switching and computing device
US2444036A (en) * 1945-03-07 1948-06-29 Munsey E Crost Signal generator for testing the resolving power of cathode-ray tubes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2338395A (en) * 1940-06-25 1944-01-04 Gen Electric Signal transmission system
US2442403A (en) * 1942-09-23 1948-06-01 Rca Corp Electronic switching and computing device
US2444036A (en) * 1945-03-07 1948-06-29 Munsey E Crost Signal generator for testing the resolving power of cathode-ray tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752490A (en) * 1950-10-02 1956-06-26 Rothstein Jerome Method of producing short pulses
US2867721A (en) * 1953-03-27 1959-01-06 Delos B Churchill Regenerative phantastron time delay circuit
US2784910A (en) * 1953-08-12 1957-03-12 Ghiorso Albert Pulse height analyzer

Also Published As

Publication number Publication date
FR942908A (fr) 1949-02-22

Similar Documents

Publication Publication Date Title
US2719226A (en) Timed signal generator
US2562530A (en) Trigger circuits
US2572038A (en) Trigger circuits
US2782303A (en) Switching system
US2425131A (en) Electronic computing circuit
US2365512A (en) Multivibrator
US2416158A (en) Frequency dividing apparatus
US2524134A (en) Bucking trigger circuit
US2756934A (en) Electronic counter
US2157533A (en) Oscillator
US2430725A (en) Triggering system for obtaining a sharp-sided output pulse shorter than the input pulse
US2691101A (en) Sweep circuit
US2533739A (en) Electronic counting ring
US2534233A (en) Electronic trigger and switch circuits
US2695955A (en) Sweep circuit
US2436482A (en) Electronic trigger circuit
US2662178A (en) Voltage generating circuit
US2281948A (en) Relaxation oscillator
US2685049A (en) Coincidence circuit
US2511093A (en) Triggering circuit
US2597630A (en) Signal shaping circuits and method
US2769905A (en) Sweep circuit
US2708240A (en) Sweep circuit
US2512984A (en) Secondary emission tube ring circuit
US2979672A (en) Trigger circuit arrangement