US3742491A - Tone device having positive feedback common emitter amplifier - Google Patents

Tone device having positive feedback common emitter amplifier Download PDF

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Publication number
US3742491A
US3742491A US00097486A US3742491DA US3742491A US 3742491 A US3742491 A US 3742491A US 00097486 A US00097486 A US 00097486A US 3742491D A US3742491D A US 3742491DA US 3742491 A US3742491 A US 3742491A
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US
United States
Prior art keywords
transistor
interrupter
terminal
call tone
emitter
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
US00097486A
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English (en)
Inventor
P Lawson
F Kocsis
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.)
CRYSTALATE ENGINEERING Ltd
Hosiden Besson Ltd
BESSON A AND PARTNER Ltd
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BESSON A AND PARTNER 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.)
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Publication of US3742491A publication Critical patent/US3742491A/en
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Assigned to HOSIDEN BESSON LIMITED reassignment HOSIDEN BESSON LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CRYSTALATE ENGINEERING LIMITED
Assigned to CRYSTALATE ENGINEERING LIMITED reassignment CRYSTALATE ENGINEERING LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 02/19/1990 Assignors: A. P. BESSON & PARTNER LIMITED
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission

Definitions

  • ABSTRACT The'tone of a call tone device is produced by a positive feedback common emitter amplifier and transducer arrangement. Voltage supply to the tone generator is. interrupted cyclically by an astable multivibrator with timer circuit to provide an intermittent call tone.
  • This invention seeks to provide a compact call tone device, for use in the radiation of tones within a wide frequency band, and to provide such device which may produce an intermittent tone.
  • a call tone device with provision for intermittent tone output, the device comprising a call tone generator and an interrupter; the said generator comprising acommon emitter transistor amplifier and a transducer having a main winding connected between the transistor collector and a voltage supply and a secondary winding connected into the base circuit of the transistor in opposite phase to the said main winding; and the said interrupter comprising an astable multi-vibrator operative to control energisation of the said tone generator.
  • FIG. 1 illustrates a circuit of a call tone generator
  • FIG. 2 illustrates a circuit of an interrupter
  • FIG. 3 illustrates in exploded view the construction of a device according to the present invention.
  • FIG. 1 there is shown a common emitter amplifier circuit with the main winding 100 of a transducer TDl connected between the collector of a transistor T1 and a supply voltage of any convenient value, e.g. 12 volts DC or 9 volts DC.
  • a transducer TDl functions in accordance with the known rocking armature principle and therefore no descriptive reference will be made hereinafter to the function of this transducer.
  • a feedback or secondary winding 101 of the transducer TDI is connected into the base circuit of the transistor T1 in opposite phase to the main winding 100 thereby to create positive feedback. Oscillation will therefore occur when there is energisation by the aforementioned supply.
  • Resistors Rl, R2 and R3 are provided and function as bias resistors, R3 functioning also as a voltage feedback resistor to minimise distortion.
  • a supplementary capacitor may be provided as indicated in broken lines at C1. This capacitor C1 serves to filter out unwanted frequencies.
  • the circuit of FIG. 1 thus generates a call tone.
  • This call tone is interrupted by means of the interrupter circuit of FIG. 2, such interruption being by electronic means, i.e. without the need to rely on mechanical contacts.
  • the interruptions produced by the circuit of FIG. 2 are at fixed intervals and the interruption intervals may be varied over a wide range.
  • the interrupter circuit comprises an astable multivibrator with a timer circuit incorporating complementary transistors T20 and T30.
  • the call tone generator is located in the collector circuit of T30 as indicated at CTG.
  • An additional transistor T10 is provided in conjunction with a resistor R20 to control the mark-space ratio.
  • the capacitor C10 charges in series with T20 which switches on, due to the charging current.
  • T30 then becomes conductive due to the action of T20 and with T30 conductive, the call tone generator located in the collector circuit of T30 is energised.
  • T10 is switched off owing to the low collector voltage or saturation voltage at T30.
  • Capacitor C10 is discharged through resistors R20, R30 and the collector/emitter path of T10. When the discharge of C10 is complete, T20 again becomes conductive.
  • This cycle then repeats until such time as the supply is completely removed, i.e. when the device is switched off.
  • resistor R30 controls the time period during which the generator is switched on and the off period is govened by the resistor R20. If desired these and other components may be rendered variable to facilitate control of the periods that depend thereupon.
  • diode D10 shown in the circuit of T20 is for reverse voltage protection and it should be further noted that supplementary resistor R10 may be introduced as illustrated in FIG. 2 to ensure constantcurrent consumption during the off period of the operating cycle.
  • the call tone device of the invention is formed as a compact three terminal integrated unit.
  • a unit comprises a case (1) with terminal tags (2), (3) and (4).
  • the case (1) embraces a printed circuit board (5) on which are mounted the components of the interrupter; an insulator (6) and suitable securing nuts and screws (7) are also provided.
  • a cover which embraces a further printed circuit board (9) on which are mounted the tone generator components; also provided are a yoke and magnet (10), a coil (11), an armature (12), a diaphragm (13) and frame (13a), a front plate (14) and plate cover (15). Also provided, as shown in the exploded view of FIG. 3, are suitable screws, nuts and terminal mouldings (16) for securing the arrangement together. Also used to secure a connecting rod (17) for the diaphragm is a suitable bonding agent such as Araldite (Trade Mark).
  • the call tone generator including the sound producing diaphragm may be regarded as lying to the left of the notional dividing line AA and the interrupter circuit may be regarded as lying to the right of the said line.
  • the interrupter circuit and soundproducing diaphragm part When assembled, the interrupter circuit and soundproducing diaphragm part is mounted on top of the call tone generator part so as to be co-extensive thereof.
  • a call tone device with provision for intermittent tone output comprising a call tone generator and an interrupter; the said generator comprising a common emitter transistor amplifier and a transducer having a main winding connected between the transistor collector and one terminal of a voltage supply and a secondary winding connected into the base circuit of the transistor in opposite phase to the said main winding; and the said interrupter comprising an astable multivibrator operative cyclically to interrupt the voltage supply to said tone generator.
  • a call tone device according to claim 1 wherein the electrical circuit components are associated on printed circuit boards housed with a tone producing diaphragm in a common case.
  • a call tone device wherein a supplementary capacitor is connected across the transistor emitter and collector in series with a said voltage feedback resistor, thereby to filter out unwanted frequencies.
  • a call tone device according to claim 3 wherein said resistors are variable.
  • a call tone device device wherein a supplementary resistor is connected between terminal of said voltage supply and a supply terminal of said interrupter, said secondary winding being connected to the juncture of said resistors, a voltage feedback resistor connected between the emitter of said transistor amplifier and said interrupter; and wherein said one terminal of the voltage supply and the emittercollector-path of said further transistor to ensure constant current consumption during the off period of the multivibrator operating cycle.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Devices For Supply Of Signal Current (AREA)
US00097486A 1970-11-13 1970-12-14 Tone device having positive feedback common emitter amplifier Expired - Lifetime US3742491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5417370 1970-11-13

Publications (1)

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US3742491A true US3742491A (en) 1973-06-26

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ID=10470159

Family Applications (1)

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US00097486A Expired - Lifetime US3742491A (en) 1970-11-13 1970-12-14 Tone device having positive feedback common emitter amplifier

Country Status (4)

Country Link
US (1) US3742491A (enExample)
JP (1) JPS5112399B1 (enExample)
DE (1) DE2061379A1 (enExample)
GB (1) GB1324018A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995492A (en) * 1975-08-11 1976-12-07 Clynes Manfred E Sound-producing isometric exerciser
US5633625A (en) * 1995-03-20 1997-05-27 Saturn Electronics & Engineering, Inc. Electronic chime module and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61185411U (enExample) * 1985-05-10 1986-11-19

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009099A (en) * 1957-05-09 1961-11-14 Schiffmann Gmbh Alois Testing instrument for electric alternating voltages
US3108597A (en) * 1958-09-12 1963-10-29 Relaxacizor Inc Generator for electronic muscle stimulator
US3341842A (en) * 1964-08-28 1967-09-12 Angelus S A Acoustical signal generator
US3341841A (en) * 1964-08-18 1967-09-12 Fontainemelon Horlogerie Electronic buzzer
US3346857A (en) * 1965-07-19 1967-10-10 Mangood Corp Plural tone audible indicating apparatus having variable time ratio of tones

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009099A (en) * 1957-05-09 1961-11-14 Schiffmann Gmbh Alois Testing instrument for electric alternating voltages
US3108597A (en) * 1958-09-12 1963-10-29 Relaxacizor Inc Generator for electronic muscle stimulator
US3341841A (en) * 1964-08-18 1967-09-12 Fontainemelon Horlogerie Electronic buzzer
US3341842A (en) * 1964-08-28 1967-09-12 Angelus S A Acoustical signal generator
US3346857A (en) * 1965-07-19 1967-10-10 Mangood Corp Plural tone audible indicating apparatus having variable time ratio of tones

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995492A (en) * 1975-08-11 1976-12-07 Clynes Manfred E Sound-producing isometric exerciser
US5633625A (en) * 1995-03-20 1997-05-27 Saturn Electronics & Engineering, Inc. Electronic chime module and method

Also Published As

Publication number Publication date
DE2061379A1 (de) 1972-05-18
GB1324018A (en) 1973-07-18
JPS5112399B1 (enExample) 1976-04-19

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AS Assignment

Owner name: CRYSTALATE ENGINEERING LIMITED

Free format text: CHANGE OF NAME;ASSIGNOR:A. P. BESSON & PARTNER LIMITED;REEL/FRAME:005909/0355

Effective date: 19910904

Owner name: HOSIDEN BESSON LIMITED

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CRYSTALATE ENGINEERING LIMITED;REEL/FRAME:005909/0357

Effective date: 19910813