AT77676B - Circuit arrangement for telephone systems with an amplifier that is equally effective as a transmitter and receiver. - Google Patents

Circuit arrangement for telephone systems with an amplifier that is equally effective as a transmitter and receiver.

Info

Publication number
AT77676B
AT77676B AT77676DA AT77676B AT 77676 B AT77676 B AT 77676B AT 77676D A AT77676D A AT 77676DA AT 77676 B AT77676 B AT 77676B
Authority
AT
Austria
Prior art keywords
transmitter
amplifier
circuit arrangement
receiver
equally effective
Prior art date
Application number
Other languages
German (de)
Original Assignee
Sueddeutsche Telefon App Kabel
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 Sueddeutsche Telefon App Kabel filed Critical Sueddeutsche Telefon App Kabel
Application granted granted Critical
Publication of AT77676B publication Critical patent/AT77676B/en

Links

Landscapes

  • Amplifiers (AREA)

Description

  

   <Desc/Clms Page number 1> 
 
 EMI1.1 
 
 EMI1.2 
 

 <Desc/Clms Page number 2> 

 
 EMI2.1 
 zurück. 



   Der Transformator P (Wicklung   3)   überträgt diese Sendeströme auf seinen   Wicklung s*   teil 1 und dadurch auf den primären Kreis des Verstärkers V. Die Sprechströme von erheblich höherer Amplitude werden durch den nun zum Sender gewordenen Transformator S auf die 
 EMI2.2 
   Kontakt r2, Leitung B.   



   Dem Kontakt rl fällt die Aufgabe zu, den Wicklungsteil 3 des Übertragers P   währer-d   der Zeitdauer des Hörempfanges aus dem Mikrophonstromkreise auszuschalten. Diese Massnahme ist durch die Forderung bedingt, die während des Hörempfanges vom eigenen   Mikrophon   herrührenden, zuweilen störenden Nebengeräusche zu beseitigen. 



   Die Umschalter r1 und r2 wirken in der Weise, dass der bewegliche Teil des Umschalters den   Ruhekontakt   erst verlässt,   nachdem   der Arbeitskontakt bereits geschlossen ist und umgekehrt.



   <Desc / Clms Page number 1>
 
 EMI1.1
 
 EMI1.2
 

 <Desc / Clms Page number 2>

 
 EMI2.1
 back.



   The transformer P (winding 3) transmits these transmission currents to its winding s * part 1 and thereby to the primary circuit of the amplifier V. The speech currents of considerably higher amplitude are transferred to the transformer S, which has now become a transmitter
 EMI2.2
   Contact r2, line B.



   The task rl falls to the task of switching off the winding part 3 of the transformer P during the duration of the hearing reception from the microphone circuit. This measure is due to the requirement to eliminate the sometimes annoying background noises originating from one's own microphone during listening.



   The changeover switches r1 and r2 act in such a way that the moving part of the changeover switch only leaves the normally closed contact after the normally open contact has already been closed and vice versa.

Claims (1)

Die Schaltungsanordnung lässt sich bei sinngemässer Anwendung ohne nennenswerte Schwierigkeiten auch auf Sprechstellen mit zentraler Mikrophonbatterie übertragen, PATENT-ANSPRUCH : EMI2.3 EMI2.4 When used analogously, the circuit arrangement can also be transferred to microphone units with a central battery of microphones without significant difficulties. PATENT CLAIM: EMI2.3 EMI2.4
AT77676D 1916-12-07 1916-12-07 Circuit arrangement for telephone systems with an amplifier that is equally effective as a transmitter and receiver. AT77676B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT77676T 1916-12-07

Publications (1)

Publication Number Publication Date
AT77676B true AT77676B (en) 1919-08-11

Family

ID=3599273

Family Applications (1)

Application Number Title Priority Date Filing Date
AT77676D AT77676B (en) 1916-12-07 1916-12-07 Circuit arrangement for telephone systems with an amplifier that is equally effective as a transmitter and receiver.

Country Status (1)

Country Link
AT (1) AT77676B (en)

Similar Documents

Publication Publication Date Title
AT77676B (en) Circuit arrangement for telephone systems with an amplifier that is equally effective as a transmitter and receiver.
AT28786B (en) Circuit for the microphone handsets in central battery telephone systems.
AT69909B (en) Secret voice circuit for line dialer telephone systems.
AT88116B (en) Additional amplifier device for any telephone set.
DE872555C (en) Conference telephone system with loudspeaker operation
AT79433B (en) Circuit arrangement for telephone systems in which the incoming and outgoing lines are each assigned a loudspeaker device.
AT38863B (en) Circuit for telephone systems with voice power amplifier.
AT76920B (en) Circuit arrangement for self-connecting telephone systems.
AT83035B (en) Circuit arrangement for telephone systems.
AT16928B (en) Call switching for telephone exchanges.
AT79264B (en) Circuit arrangement for telephone systems with voice amplifiers for incoming calls as an additional device to normal intercom equipment.
AT42000B (en) Circuit to prevent double connections in telephone exchanges.
US778322A (en) Telephone-circuit.
AT44424B (en) Circuit for call counter at telephone exchanges
AT39693B (en) Circuit arrangement for an automatic extension switchover system.
US586993A (en) Gustaf dillberg and parnell rabbidge
AT83181B (en) Loudspeaker circuit for telephone stations.
DE321702C (en) Howling device
AT72195B (en) Consultation circuit for telephone systems.
AT17732B (en) Circuit arrangement for telephone intermediate stations and terminals with a central battery.
GB146880A (en) Improvements in telephone substation circuits
DE338509C (en) Circuit arrangement for intermediate switch in telephone systems
AT88122B (en) Switching device for telephone systems with extensions.
AT91196B (en) Circuit arrangement for telephone systems with extensions connected in series.
AT83179B (en) Circuit arrangement for telephone systems with extensions.