FIELD: telephony. SUBSTANCE: device has two terminals for connection to telephone line, six diodes, lead connected to common bus, lead connected to talk-listen center, control lead, six transistors, eight resistors. Pulsed key circuit of this device is so arranged that electric resistance is ensured during dialling in stub closing not to exceed 50 Ohm at current of 35 mA and use is made of quantity-produced composite transistors without their pre-selection. EFFECT: improved design. 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| SPEECH UNIT OF TELEPHONE SET | 1990 |
|
RU2007887C1 |
| KEYBOARD-TYPE DIAL | 0 |
|
SU1053322A1 |
| CORDLESS TELEPHONE SET | 1995 |
|
RU2111616C1 |
| ELECTRONIC KEYBOARD DIAL | 0 |
|
SU1008923A1 |
| DEVICE FOR AUTOMATIC DISCONNECTION OF CALL | 0 |
|
SU1598203A2 |
| ELECTRONIC FUSE | 2016 |
|
RU2622893C1 |
| POWER SWITCH CONTROL DIAGRAM BASED ON IGBT OR MOS TRANSISTORS | 2023 |
|
RU2806902C1 |
| DEVICE FOR MONITORING STUB RESISTANCE | 0 |
|
SU1226673A1 |
| DEVICE FOR LIMITATION OF VOLTAGE ACROSS BLANKED THYRISTOR | 0 |
|
SU1744771A1 |
| POWER SWITCH CONTROL CIRCUIT BASED ON IGBT OR MIS TRANSISTORS | 2024 |
|
RU2825437C1 |
