CN2269680Y - Independent party line telephone secrecy device - Google Patents
Independent party line telephone secrecy device Download PDFInfo
- Publication number
- CN2269680Y CN2269680Y CN 96213695 CN96213695U CN2269680Y CN 2269680 Y CN2269680 Y CN 2269680Y CN 96213695 CN96213695 CN 96213695 CN 96213695 U CN96213695 U CN 96213695U CN 2269680 Y CN2269680 Y CN 2269680Y
- Authority
- CN
- China
- Prior art keywords
- bcr
- trigger
- line telephone
- party line
- phone
- 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 - Fee Related
Links
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052710 silicon Inorganic materials 0.000 abstract description 7
- 239000010703 silicon Substances 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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- Telephone Function (AREA)
Abstract
The utility model relates to a party line telephone secrecy device, which comprises a bidirectional silicon controlled rectifier BCR, a T1 of which is connected with one end of a trigger ST to form an input terminal of the secrecy device; the trigger electrode G of the bidirectional silicon controlled rectifier BCR and the other end of the trigger tube ST and a resistor R are connected in parallel; the other end of the resistor R is connected with the T2 of the bidirectional silicon controlled rectifier BCR to form an output terminal. The party line telephone secrecy device has simple structure, reliable performance, easy installation and low cost.
Description
The utility model relates to a kind of phone terminal box, especially can play the terminal box of privacy functions when a plurality of phone parallel operation.
The secret terminal box of existing in the market phone parallel operation is all party-line circuits all to be concentrated be connected in parallel in the box, inconvenience is installed, cost height, complex structure.Therefore, people consider and will independently collinear scrambler be installed on the circuit of each telephone set, for example Chinese patent application CN2147697Y discloses the secret feeder line box of a kind of ＂ party-line ＂, and its circuit is packed into after 6 elements are formed by controllable silicon, two voltage-stabiliser tubes, resistance, electric capacity and wiring boards in the existing telephone connection box totally.
The purpose of this utility model is to obtain a kind of free-standing party-line scrambler, and its structure is very simple, dependable performance, and cost is very low.
The purpose of this utility model is achieved in that
A kind of free-standing party-line scrambler, be to be connected on the circuit of telephone set, it comprises: the end of bidirectional triode thyristor BCR and trigger tube ST is connected to the end of going into of scrambler, and the trigger electrode G of bidirectional triode thyristor BCR is in parallel with the other end and the resistance R of trigger tube ST, the other end of R and the T of BCR
2Be connected to out end.
The operating voltage of trigger tube ST is 20～30 volts.
Below in conjunction with accompanying drawing in detail embodiment of the present utility model is described in detail.
Accompanying drawing is the circuit diagram of the utility model embodiment.
Operation principle of the present utility model is such: the voltage in the telephone wire is not about 60 volts during off-hook at phone, voltage is reduced to about 10 volts when off-hook because in the constant-current source position in the telephone wire, utilize this characteristic of telephone line voltages, referring to accompanying drawing, the utility model is controlled the break-make of telephone line by bidirectional triode thyristor BCR, link to each other with the trigger electrode G of controllable silicon BCR by two-way trigger tube ST and to trigger the BCR conducting, two-way trigger tube is chosen to be 30 volts, and R is that G utmost point biasing resistor is reliable when guaranteeing to close.
When ring, the moment of off-hook the voltage in the telephone wire be enough to make trigger tube ST conducting, the G utmost point that triggers BCR makes the T of bidirectional triode thyristor BCR
1, T
2Conducting, the electric current of phone DH is got back on other single line through phone through the end of going into to hold out of scrambler, and the voltage in its telephone wire also drops to about 10 volts from original 60 volts then, can enough keep its conducting through the G of the controllable silicon BCR utmost point; Simultaneously, phone in parallel with off-hook phone, that also adorned same scrambler just can't hear any sound, because the phone in the telephone wire has dropped to about 10 volts, can't make trigger tube ST conducting, also can't make controllable silicon BCR conducting, scrambler goes out to hold no current output, can play privacy functions, when the external world has phone to throw into, bell signal can make all phones in parallel all ring, which phone elder generation off-hook, and which phone is just connected, other phone then cut out in 1/10000 second time automatically, played privacy functions.Equally, when two people outwards made a phone call simultaneously, one of them people needed only and can preferentially connect in fast 1/10000 second.
Compared with prior art, the utility model only forms with 3 electronic components, and structure is non-Normal simple, to install easily, cost is very low.
Claims (2)
1. a free-standing party-line scrambler is to be connected on the circuit of telephone set, and it is characterized in that: it comprises: the T of bidirectional triode thyristor BCR
1Be connected to the end of going into of scrambler with the end of trigger tube ST, the trigger electrode G of bidirectional triode thyristor BCR is in parallel with the other end and the resistance R of trigger tube ST, the other end of resistance R and the T of BCR
2Be connected to out end.
2. telephone scrambler according to claim 1 is characterized in that: the operating voltage of trigger tube ST is 20～30 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96213695 CN2269680Y (en) | 1996-06-25 | 1996-06-25 | Independent party line telephone secrecy device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96213695 CN2269680Y (en) | 1996-06-25 | 1996-06-25 | Independent party line telephone secrecy device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2269680Y true CN2269680Y (en) | 1997-12-03 |
Family
ID=33895971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96213695 Expired - Fee Related CN2269680Y (en) | 1996-06-25 | 1996-06-25 | Independent party line telephone secrecy device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2269680Y (en) |
-
1996
- 1996-06-25 CN CN 96213695 patent/CN2269680Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAOSHAN STEEL( GROUP ) CO.,LTD. |
|
| CP03 | Change of name, title or address |
Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Patentee after: Baoshan Iron & Steel Co., Ltd. Address before: 201900 No. 1, middle front road, Baoshan District Shanghai factory Patentee before: Shanghai Baosteel (Group) Company |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |