KR910009023A - Telephone dial detection circuit - Google Patents
Telephone dial detection circuit Download PDFInfo
- Publication number
- KR910009023A KR910009023A KR1019890014906A KR890014906A KR910009023A KR 910009023 A KR910009023 A KR 910009023A KR 1019890014906 A KR1019890014906 A KR 1019890014906A KR 890014906 A KR890014906 A KR 890014906A KR 910009023 A KR910009023 A KR 910009023A
- Authority
- KR
- South Korea
- Prior art keywords
- relay
- led
- emitting diode
- diode
- detection circuit
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/02—Calling substations, e.g. by ringing
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
내용 없음.No content.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.
제1도는 본 발명의 회로도.1 is a circuit diagram of the present invention.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019890014906A KR920002954B1 (en) | 1989-10-17 | 1989-10-17 | Dial signal detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019890014906A KR920002954B1 (en) | 1989-10-17 | 1989-10-17 | Dial signal detecting circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
KR910009023A true KR910009023A (en) | 1991-05-31 |
KR920002954B1 KR920002954B1 (en) | 1992-04-10 |
Family
ID=19290766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019890014906A KR920002954B1 (en) | 1989-10-17 | 1989-10-17 | Dial signal detecting circuit |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR920002954B1 (en) |
-
1989
- 1989-10-17 KR KR1019890014906A patent/KR920002954B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR920002954B1 (en) | 1992-04-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
G160 | Decision to publish patent application | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
LAPS | Lapse due to unpaid annual fee |