DE2738042A1 - Impedance matching circuit for telephone subscriber bell - uses two antiseries connected Zener diodes in series with bell to reduce ringing voltage sensitivity at LV - Google Patents

Impedance matching circuit for telephone subscriber bell - uses two antiseries connected Zener diodes in series with bell to reduce ringing voltage sensitivity at LV

Info

Publication number
DE2738042A1
DE2738042A1 DE19772738042 DE2738042A DE2738042A1 DE 2738042 A1 DE2738042 A1 DE 2738042A1 DE 19772738042 DE19772738042 DE 19772738042 DE 2738042 A DE2738042 A DE 2738042A DE 2738042 A1 DE2738042 A1 DE 2738042A1
Authority
DE
Germany
Prior art keywords
bell
zener diodes
voltage sensitivity
telephone subscriber
matching circuit
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.)
Withdrawn
Application number
DE19772738042
Other languages
German (de)
Inventor
Frank Ziemann
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.)
Deutsche Telephonwerke und Kabelindustrie AG
Original Assignee
Deutsche Telephonwerke und Kabelindustrie AG
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 Deutsche Telephonwerke und Kabelindustrie AG filed Critical Deutsche Telephonwerke und Kabelindustrie AG
Priority to DE19772738042 priority Critical patent/DE2738042A1/en
Publication of DE2738042A1 publication Critical patent/DE2738042A1/en
Withdrawn legal-status Critical Current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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

The impedence matching circuit, for telephone subscriber sets, reduces the voltage sensitivity of the bell at low ringing signal voltages. It consists of two zener diodes in anti-series connected to the telephone set bell circuit. The diodes are connected between earth and one terminal of the bell. The zener voltages are chosen according to the bell type. The advantage lies in using standard components to increase the bell impedance.

Description

Schaltungsanordnung zur Imp edanz anp as sung und Circuit arrangement for impedance matching and

Minderung der Rufspannungsempfindlichkeit in l?ernsprechteilnehmerstationen Die Erfindung bezieht sich auf eine Schaltungsanordnung zur Impedanzanpassung und Minderung der Rufspannungsempfindlichkeit in Fernsprechteilnehmerstationen. Reduction of ringing voltage sensitivity in telephone subscriber stations The invention relates to a circuit arrangement for impedance matching and Reduction of the ringing voltage sensitivity in telephone subscriber stations.

Die Forderungen von Betreibern großer Fernsprechnetze bezüglich der Impedanz von Fernsprechstationen in Empfangsstellung bei bestimmten vorgegebenen Rufspannungen unterscheiden sich oftmals voneinander. Um trotzdem vorhandene Bauelemente, wie z. B. Fernsprechwecker, universell in den Fernsprechgeräten verwenden zu können, sind entsprechende schaltungstechnische Maßnahmen erforderlich.The demands of operators of large telephone networks regarding the Impedance of telephone stations in the receiving position at certain predetermined Ringing voltages often differ from one another. In order to still use existing components, such as B. alarm clock to be able to be used universally in telephones, appropriate circuitry measures are required.

Der Erfindung liegt die Aufgabe zugrunde, bei Verwendung handelsüblicher Bauteile in einer Fernsprechstation die Impedanz des Weckers zu erhöhen und seine Rtifspannungsempfindlichkeit bei niedrigen Ruf spannungen zu mindern.The invention is based on the object when using commercially available Components in a telephone station to increase the impedance of the alarm clock and its To reduce reverse voltage sensitivity at low ringing voltages.

Diese Aufgabe ist durch die Erfindung gelöst, die durch die Verwendung zweier in Reihe gegeneinander geschalteter Zenerdioden gekennzeichnet ist.This object is achieved by the invention, which is achieved through the use two Zener diodes connected in series against one another is marked.

In der auszugsweise dargestellten Schaltungsanordnung einer Fernsprechteilnehmerstation ist die Anordnung der Zenerdioden dargestellt: in den Weckerstromkreis werden die gegeneinander in Reihe geschalteten Zenerdioden ZI, Z2 zwischen dem einen Weckeranschluß und der Erdpotential führenden Anschlußader b geschaltet.In the circuit arrangement of a telephone subscriber station shown in extracts the arrangement of the zener diodes is shown: in the alarm clock circuit the Zener diodes ZI, Z2 connected in series against one another between the one alarm clock connection and the connection wire b carrying ground potential is connected.

Für handelsübliche Wecker W aus verschiedenen Produktionen ergeben sich gegebenenfalls unterschiedliche Werte für die Zenerspannung, die durch Auswahl entsprechender Dioden auf den jeweils optimalen Wert abgestimmt werden.For standard alarm clocks W from different productions possibly different values for the Zener voltage, which can be determined by selection corresponding diodes can be matched to the optimum value in each case.

Durch das Vorschalten der Zenerdioden ZI, Z2 wird die Impedanz des Weckers W erhöht und gleichzeitig dessen hohe Empfindlichkeit bei niedrigen Rufspannungen herabgesetzt.By connecting the Zener diodes ZI, Z2, the impedance of the Alarm clock W increases and at the same time its high sensitivity at low ringing voltages degraded.

Die Bevorzugung von Zenerdioden ZI, Z2 gegenüber ohmschen Widerständen gewährleistet eine nur geringfügige Minderung der Weckerlautstärke.The preference of Zener diodes ZI, Z2 over ohmic resistances ensures only a slight reduction in the volume of the alarm clock.

LeerseiteBlank page

Claims (1)

PatentansPruch: Schaltungsanordnung zur Imp edanz anp as sung und Minderung der Buf sp annungsemp findl i chkeit in Fernsprechteilnehmerstationen, dadurch gekennzeichnet, daß dem Wecker der Teilnehmerstation zwei in Reihe gegeneinander geschaltete Zenerdioden vorgeschaltet werden. Claim: Circuit arrangement for impedance adjustment and Reduction of the buffer voltage sensitivity in telephone subscriber stations, characterized in that the alarm clock of the subscriber station two in series against each other switched Zener diodes are connected upstream.
DE19772738042 1977-08-19 1977-08-19 Impedance matching circuit for telephone subscriber bell - uses two antiseries connected Zener diodes in series with bell to reduce ringing voltage sensitivity at LV Withdrawn DE2738042A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772738042 DE2738042A1 (en) 1977-08-19 1977-08-19 Impedance matching circuit for telephone subscriber bell - uses two antiseries connected Zener diodes in series with bell to reduce ringing voltage sensitivity at LV

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772738042 DE2738042A1 (en) 1977-08-19 1977-08-19 Impedance matching circuit for telephone subscriber bell - uses two antiseries connected Zener diodes in series with bell to reduce ringing voltage sensitivity at LV

Publications (1)

Publication Number Publication Date
DE2738042A1 true DE2738042A1 (en) 1979-03-01

Family

ID=6017109

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19772738042 Withdrawn DE2738042A1 (en) 1977-08-19 1977-08-19 Impedance matching circuit for telephone subscriber bell - uses two antiseries connected Zener diodes in series with bell to reduce ringing voltage sensitivity at LV

Country Status (1)

Country Link
DE (1) DE2738042A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191526A2 (en) * 1985-02-09 1986-08-20 Philips Patentverwaltung GmbH Evaluating circuit for alternating currents or voltages

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191526A2 (en) * 1985-02-09 1986-08-20 Philips Patentverwaltung GmbH Evaluating circuit for alternating currents or voltages
EP0191526A3 (en) * 1985-02-09 1988-07-27 Philips Patentverwaltung GmbH Evaluating circuit for alternating currents or voltages

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Legal Events

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8139 Disposal/non-payment of the annual fee