JPH02138948U - - Google Patents
Info
- Publication number
- JPH02138948U JPH02138948U JP4900889U JP4900889U JPH02138948U JP H02138948 U JPH02138948 U JP H02138948U JP 4900889 U JP4900889 U JP 4900889U JP 4900889 U JP4900889 U JP 4900889U JP H02138948 U JPH02138948 U JP H02138948U
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- light emitting
- emitting diode
- phototransistor
- resistor
- 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Audible And Visible Signals (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Description
第１図は本考案によるインターホンの呼出回路
の一実施例を示す回路図、第２図は第１図のイン
ターホンの呼出回路の子機にダイオードブリツヂ
を設けた他の実施例を示す回路図、第３図は従来
のインターホンの呼出回路の回路図である。
２……呼出釦、３……ホトカプラ、Ｄ２……発
光ダイオード、Ｑ２……ホトトランジスタ。
FIG. 1 is a circuit diagram showing one embodiment of the intercom calling circuit according to the present invention, and FIG. 2 is a circuit diagram showing another embodiment in which a diode bridge is provided in the handset of the intercom calling circuit of FIG. 1. 3 are circuit diagrams of a conventional intercom calling circuit. 2...Call button, 3...Photocoupler, D2 ...Light emitting diode, Q2 ...Phototransistor.
Claims (1)
ラインと、ホトトランジスタの一方の電極が前記
第１の通話ラインに接続され、他方の電極が発光
ダイオードの一方の電極に接続されたホトカプラ
と、前記ホトトランジスタの他方の電極と前記発
光ダイオードの一方の電極の接続点に他端が接続
され、一端が第１の通話ラインに接続された呼出
釦と、基準電位点に接続された第２の通話ライン
に一端が接続され、他端が前記発光ダイオードの
他方の電極に接続された抵抗とを備えたインター
ホンの呼出回路。 First and second communication lines connecting the base unit and the slave unit, one electrode of a phototransistor is connected to the first communication line, and the other electrode is connected to one electrode of a light emitting diode. a photocoupler whose other end is connected to a connection point between the other electrode of the phototransistor and one electrode of the light emitting diode, a call button whose one end is connected to a first call line, and a reference potential point. a resistor having one end connected to a second call line and a resistor having the other end connected to the other electrode of the light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4900889U JPH067604Y2 (en) | 1989-04-26 | 1989-04-26 | Intercom calling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4900889U JPH067604Y2 (en) | 1989-04-26 | 1989-04-26 | Intercom calling circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02138948U true JPH02138948U (en) | 1990-11-20 |
| JPH067604Y2 JPH067604Y2 (en) | 1994-02-23 |
Family
ID=31566326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4900889U Expired - Lifetime JPH067604Y2 (en) | 1989-04-26 | 1989-04-26 | Intercom calling circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067604Y2 (en) |
-
1989
- 1989-04-26 JP JP4900889U patent/JPH067604Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH067604Y2 (en) | 1994-02-23 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |