JPH032431U - - Google Patents
Info
- Publication number
- JPH032431U JPH032431U JP5993489U JP5993489U JPH032431U JP H032431 U JPH032431 U JP H032431U JP 5993489 U JP5993489 U JP 5993489U JP 5993489 U JP5993489 U JP 5993489U JP H032431 U JPH032431 U JP H032431U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- transistor
- led
- microcomputer
- collector
- 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
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は本考案の実施例を示す電気回路図、第
２図は同実施例の動作波形図、第３図は従来技術
説明の為のカセツトテープ走行図である。
５……発光ダイオード、６……システムコント
ロール用マイコン、７……カセツト検出信号であ
る。
FIG. 1 is an electric circuit diagram showing an embodiment of the present invention, FIG. 2 is an operating waveform diagram of the same embodiment, and FIG. 3 is a cassette tape running diagram for explaining the prior art. 5...Light emitting diode, 6...System control microcomputer, 7...Cassette detection signal.
Claims (1)
ＬＥＤ回路において、電源ラインに第１の抵抗と
第２の抵抗を直列に接続し、同第２の抵抗を第１
のトランジスタのエミツタに接続し、同第１のト
ランジスタのコレクタにＬＥＤを同ＬＥＤのカソ
ードを接地側するように接続し、また、前記第１
の抵抗に並列となるように第２のトランジスタの
エミツタを前記電源ラインに接続しまた同第２の
トランジスタのコレクタを前記第１の抵抗と前記
第２の抵抗の接続点に接続し、更に、マイコンの
第１の出力と前記第１のトランジスタのベースを
接続し、同マイコンの第２の出力と前記第２のト
ランジスタのベースを接続し、同マイコンの入力
端子へカセツト検出信号を接続して、挿入するビ
デオカセツトの種類により前記ＬＥＤの発光量を
切換えてなるセンサＬＥＤ電流切換回路。 In an LED circuit for detecting the start and end of a video cassette tape, a first resistor and a second resistor are connected in series to the power supply line, and the second resistor is connected to the first resistor.
an LED is connected to the collector of the first transistor so that the cathode of the LED is connected to the ground side;
The emitter of a second transistor is connected to the power supply line so as to be parallel to the resistor, and the collector of the second transistor is connected to the connection point of the first resistor and the second resistor, and further, A first output of the microcomputer is connected to the base of the first transistor, a second output of the microcomputer is connected to the base of the second transistor, and a cassette detection signal is connected to the input terminal of the microcomputer. . A sensor LED current switching circuit that switches the amount of light emitted from the LED depending on the type of video cassette inserted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5993489U JPH032431U (en) | 1989-05-24 | 1989-05-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5993489U JPH032431U (en) | 1989-05-24 | 1989-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH032431U true JPH032431U (en) | 1991-01-11 |
Family
ID=31586873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5993489U Pending JPH032431U (en) | 1989-05-24 | 1989-05-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH032431U (en) |
-
1989
- 1989-05-24 JP JP5993489U patent/JPH032431U/ja active Pending
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