JPS5828472U - Signal switching circuit - Google Patents
Signal switching circuitInfo
- Publication number
- JPS5828472U JPS5828472U JP12265381U JP12265381U JPS5828472U JP S5828472 U JPS5828472 U JP S5828472U JP 12265381 U JP12265381 U JP 12265381U JP 12265381 U JP12265381 U JP 12265381U JP S5828472 U JPS5828472 U JP S5828472U
- Authority
- JP
- Japan
- Prior art keywords
- output terminal
- input terminal
- signal
- television
- switching 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.)
- Pending
Links
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Electronic Switches (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は信号切換え回路の機能を説明するための図面で
ある。第２図は従来の信号切換え回路を示す回路図であ
る。第３図は本考案を実施した信号切換え回路を示す回
路図であり、第４図は本考案の他の実施例の回路図であ
る。
１・・・ＶＴＲ，２・・・テレビ回路、３・・・外部ア
ンテナ、４・・・第１入力端子、８・・・第２入力端子
、９・・・出力端子、（十Ｂ）・・・電源、Ｒ３・・・
バイアス抵抗、Ｄ５゜Ｄ５′・・・可変容量ダイオード
、Ｄ３．Ｄ、・・・スイッチ 、ングダイオード、Ｓ
Ｗ・・・切換えスイッチ。FIG. 1 is a diagram for explaining the function of the signal switching circuit. FIG. 2 is a circuit diagram showing a conventional signal switching circuit. FIG. 3 is a circuit diagram showing a signal switching circuit embodying the present invention, and FIG. 4 is a circuit diagram of another embodiment of the present invention. 1... VTR, 2... Television circuit, 3... External antenna, 4... First input terminal, 8... Second input terminal, 9... Output terminal, (10B). ...Power supply, R3...
Bias resistor, D5°D5'...variable capacitance diode, D3. D,...switch, diode, S
W: Changeover switch.
Claims (1)
端子と、ＶＴＲ信号が与えられる第２入力端子と、テレ
ビ回路に通じる出力端子と、前記第１入力端子と出力端
子間に接続された可変容量ダイオードと、前記第２入力
端子と出力端子間に接続されたスイッチングダイオード
と、前記出力端子とアース間に設けられたバイアス抵抗
と、ＶＴＲに設けられた電源と、前記電源をＶＴＲ信号
受信時には前記スイッチングダイオードを導通せしめる
と共に可変容量ダイオードを逆バイアスするように結合
しテレビ入力信号受信時には前記電源を前記各ダイオー
ドに対し遮断する切換えスイッチとからなる信号切換え
回路。A first input terminal to which a television input signal is applied from an external antenna, a second input terminal to which a VTR signal is applied, an output terminal connected to the television circuit, and a variable capacitance diode connected between the first input terminal and the output terminal. a switching diode connected between the second input terminal and the output terminal; a bias resistor provided between the output terminal and ground; a power supply provided in the VTR; and a switching diode connected between the second input terminal and the output terminal; A signal switching circuit comprising a changeover switch that connects a diode to conduction and reverse biases a variable capacitance diode, and cuts off the power source to each of the diodes when receiving a television input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12265381U JPS5828472U (en) | 1981-08-18 | 1981-08-18 | Signal switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12265381U JPS5828472U (en) | 1981-08-18 | 1981-08-18 | Signal switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5828472U true JPS5828472U (en) | 1983-02-24 |
Family
ID=29916574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12265381U Pending JPS5828472U (en) | 1981-08-18 | 1981-08-18 | Signal switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5828472U (en) |
-
1981
- 1981-08-18 JP JP12265381U patent/JPS5828472U/en active Pending
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