JPH089947Y2 - 線路極性検知回路 - Google Patents
線路極性検知回路Info
- Publication number
- JPH089947Y2 JPH089947Y2 JP1989147107U JP14710789U JPH089947Y2 JP H089947 Y2 JPH089947 Y2 JP H089947Y2 JP 1989147107 U JP1989147107 U JP 1989147107U JP 14710789 U JP14710789 U JP 14710789U JP H089947 Y2 JPH089947 Y2 JP H089947Y2
- Authority
- JP
- Japan
- Prior art keywords
- line
- telephone
- polarity detection
- detection circuit
- transistors
- 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
- 238000001514 detection method Methods 0.000 title claims description 27
- 239000000872 buffer Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989147107U JPH089947Y2 (ja) | 1989-12-22 | 1989-12-22 | 線路極性検知回路 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989147107U JPH089947Y2 (ja) | 1989-12-22 | 1989-12-22 | 線路極性検知回路 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0386649U JPH0386649U (en, 2012) | 1991-09-02 |
| JPH089947Y2 true JPH089947Y2 (ja) | 1996-03-21 |
Family
ID=31693639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989147107U Expired - Fee Related JPH089947Y2 (ja) | 1989-12-22 | 1989-12-22 | 線路極性検知回路 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH089947Y2 (en, 2012) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58207755A (ja) * | 1982-02-09 | 1983-12-03 | Iwatsu Electric Co Ltd | 極性反転検知回路 |
| JPS61131948A (ja) * | 1984-11-30 | 1986-06-19 | Toshiba Corp | ベル着信回路 |
-
1989
- 1989-12-22 JP JP1989147107U patent/JPH089947Y2/ja not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0386649U (en, 2012) | 1991-09-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |