ES417537A1 - Push-button calling circuits for telephone sets - Google Patents
Push-button calling circuits for telephone setsInfo
- Publication number
- ES417537A1 ES417537A1 ES417537A ES417537A ES417537A1 ES 417537 A1 ES417537 A1 ES 417537A1 ES 417537 A ES417537 A ES 417537A ES 417537 A ES417537 A ES 417537A ES 417537 A1 ES417537 A1 ES 417537A1
- Authority
- ES
- Spain
- Prior art keywords
- transistor
- thyristor
- circuit
- transistors
- resistance
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
Abstract
Improvements in push-button call circuits for subscriber telephone sets of the type that use a keyboard unit (keypad) to make calls, consisting of sending impulse trains to the telephone line, by purely electronic means, and with the adequate characteristics so that they are acceptable by the Control unit to which the apparatus is connected, the apparatus being equipped with more or less conventional means of generation, storage and production of impulses (keyboard unit, integrated circuit, etc. and power supply). of the call circuit by means of the line current, said improvements being characterized in that, referring to Fig. 1, the circuit includes: transistors T1 and T7 and resistance R10, to produce the openings and closings of the line loop according to with the orders given by the impulse generating system (CON); the resistors R1 and R2, to avoid undue actions of the transistor T1 due to NO leakage currents; transistors T5 and T6, to cancel the high impedance that R10 represents and achieve the fast charge of the power capacitor of the call circuit; the thyristor TR, for connecting or disconnecting the line loop speech circuit; transistors T3 and T4 and resistor R5, to trip the thyristor TR; transistor T2 to block transistor T3 and, consequently, thyristor TR; resistors R3 and R4, to avoid undue actions of transistor T2 due to leakage current in the CON circuit; transistor T8 and resistor R11, to block transistors T5 and T6 during conversation periods; capacitor C3 and resistance R11 so that the thyristor TR turns on before the transistor T8; and resistance R12, to prime the thyristor TR. (Machine-translation by Google Translate, not legally binding)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES417537A ES417537A1 (en) | 1973-08-03 | 1973-08-03 | Push-button calling circuits for telephone sets |
| AU71770/74A AU490662B2 (en) | 1973-08-03 | 1974-07-29 | Improvements in pushbutton calling circuits for telephone sets |
| GB3357774A GB1440542A (en) | 1973-08-03 | 1974-07-30 | Push-button calling circuits for telephone sets |
| FR7426888A FR2239828B1 (en) | 1973-08-03 | 1974-08-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES417537A ES417537A1 (en) | 1973-08-03 | 1973-08-03 | Push-button calling circuits for telephone sets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES417537A1 true ES417537A1 (en) | 1976-03-01 |
Family
ID=8464781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES417537A Expired ES417537A1 (en) | 1973-08-03 | 1973-08-03 | Push-button calling circuits for telephone sets |
Country Status (3)
| Country | Link |
|---|---|
| ES (1) | ES417537A1 (en) |
| FR (1) | FR2239828B1 (en) |
| GB (1) | GB1440542A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2541903C3 (en) * | 1975-09-19 | 1979-09-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Circuit arrangement for subscriber stations fed via their connection lines with impulse dialing in telecommunication systems, in particular telephone systems |
| EP0027302A1 (en) * | 1979-10-10 | 1981-04-22 | Suchi Chiou | Interface circuits for touch-pulse telephones |
| FR2505586A1 (en) * | 1981-05-05 | 1982-11-12 | Thomson Csf Mat Tel | Keyboard telephone receiver with stabilised power supply - contains transistors in series with supply to control open and short circuit condition of line during dialling |
| FR2508744A1 (en) * | 1981-06-26 | 1982-12-31 | Thomson Csf Mat Tel | Pushbutton telephone with remote supply sound amplifier - has power supply in series with microphone and earphone terminal through control circuit and uses regulator for amplifier |
-
1973
- 1973-08-03 ES ES417537A patent/ES417537A1/en not_active Expired
-
1974
- 1974-07-30 GB GB3357774A patent/GB1440542A/en not_active Expired
- 1974-08-02 FR FR7426888A patent/FR2239828B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU7177074A (en) | 1976-01-29 |
| GB1440542A (en) | 1976-06-23 |
| FR2239828B1 (en) | 1978-02-17 |
| FR2239828A1 (en) | 1975-02-28 |
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