JPS5531381A - Interphone device - Google Patents
Interphone deviceInfo
- Publication number
- JPS5531381A JPS5531381A JP10528378A JP10528378A JPS5531381A JP S5531381 A JPS5531381 A JP S5531381A JP 10528378 A JP10528378 A JP 10528378A JP 10528378 A JP10528378 A JP 10528378A JP S5531381 A JPS5531381 A JP S5531381A
- Authority
- JP
- Japan
- Prior art keywords
- talking
- speaker
- amplifier
- oscillator
- switch
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
Abstract
PURPOSE:To make it unnecessary to use a relay by applying the output of the alarm oscillator to a speaker of the secondary device by means of the circuit configuration to which three transistors are used. CONSTITUTION:When the emergency switch 12 or 39 is closed in case the master device is in a waiting state, the transistor Tr21 is turned ON, the alarm sound oscillator 13 is operated, simultaneously Tr22 and 23 are turned ON through the diode 37, and the talking amplifier 15 is made to be an operation state. At the same time, not only the talking current is supplied to the secondary device 2, but also the talking circuit is formed between the master device 1 and the secondary device 2 by connecting the speaker 20 to the input terminal I<+> of the amplifier 15 with the hook-switch 17. In this case, however, since the output of the oscillator 13 is connected to the terminal I<-> of the amplifier 15, an alarm sound is generated from the speaker 42 after amplifying the afore-mentioned signal. Also, the foregoing is operated in the same way even when the switch 12 or 39 is closed in the state that the master device 1 is in talking, that is, the hook-switches 17, 18 have been changed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10528378A JPS5857945B2 (en) | 1978-08-28 | 1978-08-28 | intercom device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10528378A JPS5857945B2 (en) | 1978-08-28 | 1978-08-28 | intercom device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5531381A true JPS5531381A (en) | 1980-03-05 |
JPS5857945B2 JPS5857945B2 (en) | 1983-12-22 |
Family
ID=14403339
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10528378A Expired JPS5857945B2 (en) | 1978-08-28 | 1978-08-28 | intercom device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5857945B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5863694U (en) * | 1981-10-19 | 1983-04-28 | アイホン株式会社 | Intercom system with two alarm functions |
JPS5938898A (en) * | 1982-08-27 | 1984-03-02 | ホーチキ株式会社 | Outdoor alarm utilizing interphone equipment |
JPS6076482U (en) * | 1983-10-31 | 1985-05-28 | 松下電工株式会社 | Door phone unit with alarm display |
JPH02130097U (en) * | 1990-01-18 | 1990-10-26 |
-
1978
- 1978-08-28 JP JP10528378A patent/JPS5857945B2/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5863694U (en) * | 1981-10-19 | 1983-04-28 | アイホン株式会社 | Intercom system with two alarm functions |
JPH0229496Y2 (en) * | 1981-10-19 | 1990-08-08 | ||
JPS5938898A (en) * | 1982-08-27 | 1984-03-02 | ホーチキ株式会社 | Outdoor alarm utilizing interphone equipment |
JPS6076482U (en) * | 1983-10-31 | 1985-05-28 | 松下電工株式会社 | Door phone unit with alarm display |
JPH02130097U (en) * | 1990-01-18 | 1990-10-26 |
Also Published As
Publication number | Publication date |
---|---|
JPS5857945B2 (en) | 1983-12-22 |
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