JPH0466732U - - Google Patents
Info
- Publication number
- JPH0466732U JPH0466732U JP11015290U JP11015290U JPH0466732U JP H0466732 U JPH0466732 U JP H0466732U JP 11015290 U JP11015290 U JP 11015290U JP 11015290 U JP11015290 U JP 11015290U JP H0466732 U JPH0466732 U JP H0466732U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- resistor
- switch
- electrode
- power source
- 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 1
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Keying Circuit Devices (AREA)
Description
第１図および第２図はこの考案の一実施例を示
すもので、第１図は回路図、第２図はスイツチの
内部抵抗を考慮した等価回路図、第３図はこの考
案の他の実施例を示す回路図、第４図および第５
図は従来例を示すもので、第４図は回路図、第５
図はスイツチの内部抵抗を考慮した等価回路図で
ある。
１２……スイツチ、１３……第１の抵抗、１４
，１８……トランジスタ、１５……第２の抵抗、
１６，１９……Ｃ−ＭＯＳロジツク回路。
Figures 1 and 2 show one embodiment of this invention. Figure 1 is a circuit diagram, Figure 2 is an equivalent circuit diagram taking into account the internal resistance of the switch, and Figure 3 is an example of another embodiment of this invention. Circuit diagrams showing embodiments, FIGS. 4 and 5
The figures show a conventional example, with Figure 4 being a circuit diagram and Figure 5 being a circuit diagram.
The figure is an equivalent circuit diagram that takes into account the internal resistance of the switch. 12...Switch, 13...First resistor, 14
, 18... transistor, 15... second resistor,
16, 19...C-MOS logic circuit.
Claims (1)
ンジスタと、このトランジスタのベースと前記直
流電源の一方の電極又は他方の電極との間に第２
の抵抗を介して接続されたスイツチと、ハイレベ
ル、ローレベル判定のための２つのスレツシヨル
ドレベルを有し、前記トランジスタと第１の抵抗
との接続点電圧を入力して前記スイツチの開閉を
検出するロジツク回路からなることを特徴とする
スイツチ検出回路。 A transistor connected to a DC power source via a first resistor, and a second transistor connected between the base of this transistor and one electrode or the other electrode of the DC power source.
The switch is connected through a resistor and has two threshold levels for high level and low level determination, and the switch is opened and closed by inputting the voltage at the connection point between the transistor and the first resistor. A switch detection circuit comprising a logic circuit that detects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11015290U JPH0466732U (en) | 1990-10-23 | 1990-10-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11015290U JPH0466732U (en) | 1990-10-23 | 1990-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0466732U true JPH0466732U (en) | 1992-06-12 |
Family
ID=31857447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11015290U Pending JPH0466732U (en) | 1990-10-23 | 1990-10-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0466732U (en) |
-
1990
- 1990-10-23 JP JP11015290U patent/JPH0466732U/ja active Pending