JPS57131128A - Proximity switch oscillating circuit - Google Patents

Proximity switch oscillating circuit

Info

Publication number
JPS57131128A
JPS57131128A JP56017100A JP1710081A JPS57131128A JP S57131128 A JPS57131128 A JP S57131128A JP 56017100 A JP56017100 A JP 56017100A JP 1710081 A JP1710081 A JP 1710081A JP S57131128 A JPS57131128 A JP S57131128A
Authority
JP
Japan
Prior art keywords
transistor
current
base
circuit
emitter
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
JP56017100A
Other languages
Japanese (ja)
Other versions
JPH0226412B2 (en
Inventor
Masahei Akasu
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56017100A priority Critical patent/JPS57131128A/en
Publication of JPS57131128A publication Critical patent/JPS57131128A/en
Publication of JPH0226412B2 publication Critical patent/JPH0226412B2/ja
Granted 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
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
    • H03K17/9547—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator with variable amplitude

Landscapes

  • Geophysics And Detection Of Objects (AREA)
  • Electronic Switches (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

PURPOSE:To remove dependency of a negative conductance value on a temperature, supply voltage, etc., and to always hold constant detecting sensitivity, by cascading a transistor amplifier whose base has been grounded, to an output of a current mirror circuit. CONSTITUTION:Oscillating voltage generated in an LC resonance circuit consisting of a detecting coil 4 and a capacitor 5 is converted to a current by a transistor 6, and drives a current mirror circuit consisting of transistors 8, 9. An output current from the transistor 9 is inputted to the emitter of a transistor 11 which has been cascaded. The transistor 11 is a base grounding circuit whose base has been held at constant potential, an emitter current whose current gain is almost ''1'' is outputted to the collector, is fed back to a base point A of the transistor 6, and the admittance which has seen the active circuit side from the LC resonance circuit becomes a negative conductance value.
JP56017100A 1981-02-06 1981-02-06 Proximity switch oscillating circuit Granted JPS57131128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56017100A JPS57131128A (en) 1981-02-06 1981-02-06 Proximity switch oscillating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56017100A JPS57131128A (en) 1981-02-06 1981-02-06 Proximity switch oscillating circuit

Publications (2)

Publication Number Publication Date
JPS57131128A true JPS57131128A (en) 1982-08-13
JPH0226412B2 JPH0226412B2 (en) 1990-06-11

Family

ID=11934587

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56017100A Granted JPS57131128A (en) 1981-02-06 1981-02-06 Proximity switch oscillating circuit

Country Status (1)

Country Link
JP (1) JPS57131128A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59212026A (en) * 1983-05-17 1984-11-30 Omron Tateisi Electronics Co Oscillation circuit for proximity switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59212026A (en) * 1983-05-17 1984-11-30 Omron Tateisi Electronics Co Oscillation circuit for proximity switch

Also Published As

Publication number Publication date
JPH0226412B2 (en) 1990-06-11

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