GB938008A - Improvements in or relating to telephone ringing generators - Google Patents

Improvements in or relating to telephone ringing generators

Info

Publication number
GB938008A
GB938008A GB35617/59A GB3561759A GB938008A GB 938008 A GB938008 A GB 938008A GB 35617/59 A GB35617/59 A GB 35617/59A GB 3561759 A GB3561759 A GB 3561759A GB 938008 A GB938008 A GB 938008A
Authority
GB
United Kingdom
Prior art keywords
transformer
auto
telephone ringing
saturable core
relating
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
GB35617/59A
Inventor
Derrick Barnett
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.)
Ericsson Telephones Ltd
Original Assignee
Ericsson Telephones 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 Ericsson Telephones Ltd filed Critical Ericsson Telephones Ltd
Priority to GB35617/59A priority Critical patent/GB938008A/en
Publication of GB938008A publication Critical patent/GB938008A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • 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
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
    • 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
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
    • 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
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1296—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the feedback circuit comprising a transformer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Dc-Dc Converters (AREA)

Abstract

938,008. Transistor oscillator circuits. ERICSSON TELEPHONES Ltd. Jan. 19, 1961 [Oct. 21, 1959], No. 35617/59. Class 40 (6). A telephone ringing current generator comprises a push-pull transistor oscillator having a saturable core feed-back transformer formed from a single continuous tapped winding. The ringing generator shown comprises a pair of transistors with a saturable core auto-transformer coupling the emitter and the base circuits. Capacitors 129 and 130 are connected between collector and base electrodes to prevent voltage spikes being developed and an output terminal 145 is connected through a capacitor 136 which tunes the load circuit, the connection being to the end of the auto-transformer winding or to one of the tappings thereon. Specification 938,007 is referred to.
GB35617/59A 1959-10-21 1959-10-21 Improvements in or relating to telephone ringing generators Expired GB938008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB35617/59A GB938008A (en) 1959-10-21 1959-10-21 Improvements in or relating to telephone ringing generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35617/59A GB938008A (en) 1959-10-21 1959-10-21 Improvements in or relating to telephone ringing generators

Publications (1)

Publication Number Publication Date
GB938008A true GB938008A (en) 1963-09-25

Family

ID=10379709

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35617/59A Expired GB938008A (en) 1959-10-21 1959-10-21 Improvements in or relating to telephone ringing generators

Country Status (1)

Country Link
GB (1) GB938008A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3334270A (en) * 1964-09-04 1967-08-01 Gen Electric Discharge lamp circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3334270A (en) * 1964-09-04 1967-08-01 Gen Electric Discharge lamp circuit

Similar Documents

Publication Publication Date Title
GB882126A (en) Improvements in or relating to electrical inverter systems
ES430226A1 (en) Drive circuit for a controllable electronic switching element, for example, a power transistor
GB743450A (en) Improvements in impedance converting devices employing transistors
GB803186A (en) Negative-impedance transistor oscillator
GB948241A (en) A circuit arrangement including a telephone instrument
GB938008A (en) Improvements in or relating to telephone ringing generators
FR2301948A1 (en) Transistor circuit with internal overload and shorting protection - consisting of internal emitter series resistor and internal turn-off circuit
ES262304A1 (en) Transistor voltage converter
GB908039A (en) Improvements in or relating to push-pull transistor inverters
GB844075A (en) Improvements in or relating to transistor oscillators
SE7902832L (en) SUBSCRIBER CIRCUIT INCLUDING A SYMMETRIC POWER AMPLIFIER FOR SUPPLYING A SUBSCRIBER MANAGEMENT
US3065309A (en) Electronic tone generator
US3253234A (en) Free-running multivibrator using a single cross-coupling capacitor
GB1021854A (en) Telephone set circuits
GB847417A (en) Improvements relating to electric discharge lamp circuits
GB802104A (en) Improvements relating to transistor oscillator circuits
GB879146A (en) Transistor oscillators
SU425325A1 (en) TARGETED GENERATOR
US3391352A (en) Oscillator starting circuit
SU660254A1 (en) Switch
US3694773A (en) Tone burst generator
GB893810A (en) Improvements relating to oscillators incorporating transistors
JPS5546881A (en) Inverter
GB869454A (en) Electrical inverter systems employing semiconductor devices
GB1004266A (en) Improvements in and relating to transistor oscillator circuits