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JPS5646335A - Switch circuit - Google Patents

Switch circuit

Info

Publication number
JPS5646335A
JPS5646335A JP12219779A JP12219779A JPS5646335A JP S5646335 A JPS5646335 A JP S5646335A JP 12219779 A JP12219779 A JP 12219779A JP 12219779 A JP12219779 A JP 12219779A JP S5646335 A JPS5646335 A JP S5646335A
Authority
JP
Japan
Prior art keywords
trq
resistance
swn
power supply
base
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
Application number
JP12219779A
Other languages
Japanese (ja)
Other versions
JPS6020935B2 (en
Inventor
Kazuhiro Murai
Nobuyuki Kondo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Shirasuna Electric Corp
Original Assignee
Shin Shirasuna Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shin Shirasuna Electric Corp filed Critical Shin Shirasuna Electric Corp
Priority to JP12219779A priority Critical patent/JPS6020935B2/en
Publication of JPS5646335A publication Critical patent/JPS5646335A/en
Publication of JPS6020935B2 publication Critical patent/JPS6020935B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To enable to detect two or more switches depressed at one time, by connecting a resistance between the base of the transistor and the power supply and connecting a plurality of series circuits of a resistance and a switch SW in parallel with the base and ground. CONSTITUTION:The collector of a pnp transistor TRQ is grounded via a resistor RL and also connected to the output terminal T0. The emitter of TRQ is connected to the power supply E via the Zener diode DZ, and the emitter is grounded via the bias resistance RE of the diode DZ. The base of TRQ is connected to the power supply E via the resistance R1, and further resistances R21... R2n are connected in parallel, which are respectively grounded via SW1... SWN. When all the SW1... SWN are on or an arbitrary switch is on, TRQ is off and the terminal T0 is at ground level and a given level can always be given to the terminals t1... tn corresponding to the SWs. If two or more switches SW1... SWN are simultaneously on, TRQ is ON, resulting that the voltage at the terminal T0 fluctuates, allowing to detect the depression of the SWs in error.
JP12219779A 1979-09-22 1979-09-22 switch circuit Expired JPS6020935B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12219779A JPS6020935B2 (en) 1979-09-22 1979-09-22 switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12219779A JPS6020935B2 (en) 1979-09-22 1979-09-22 switch circuit

Publications (2)

Publication Number Publication Date
JPS5646335A true JPS5646335A (en) 1981-04-27
JPS6020935B2 JPS6020935B2 (en) 1985-05-24

Family

ID=14829960

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12219779A Expired JPS6020935B2 (en) 1979-09-22 1979-09-22 switch circuit

Country Status (1)

Country Link
JP (1) JPS6020935B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100345107B1 (en) * 1999-11-25 2002-07-24 현대자동차주식회사 Contact switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100345107B1 (en) * 1999-11-25 2002-07-24 현대자동차주식회사 Contact switch

Also Published As

Publication number Publication date
JPS6020935B2 (en) 1985-05-24

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