JPS5636233A - Automatic frequency control alarm circuit - Google Patents

Automatic frequency control alarm circuit

Info

Publication number
JPS5636233A
JPS5636233A JP11138779A JP11138779A JPS5636233A JP S5636233 A JPS5636233 A JP S5636233A JP 11138779 A JP11138779 A JP 11138779A JP 11138779 A JP11138779 A JP 11138779A JP S5636233 A JPS5636233 A JP S5636233A
Authority
JP
Japan
Prior art keywords
signal
circuit
amplifier
frequency control
automatic frequency
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
Application number
JP11138779A
Other languages
Japanese (ja)
Inventor
Nobuo Takenaka
Kiyoaki Takahashi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11138779A priority Critical patent/JPS5636233A/en
Publication of JPS5636233A publication Critical patent/JPS5636233A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop

Landscapes

  • Emergency Alarm Devices (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To detect a fluctuation period even if this period is short, by outputting alarm when the amplitude of the signal, which is caused to pass through the AC amplifier which amplifies the signal obtained by converting frequency fluctuation to voltage change, exceeds allowable fluctuation. CONSTITUTION:In automatic frequency control circuit 13, the signal converted to an AC voltage passes through AC amplifier 9 and has a part connected to DC amplifier 16 in AC. A reference DC voltage corresponding to the middle point of the hysteresis of Schmitt trigger circuit 18 is superposed onto the signal in amplifier 16, and the obtained signal is applied to circuit 18. When the signal exceeds the threshold voltage of circuit 18, the output of circuit 18 is inverted. Retriggerrable monostable multivibrator 19 is started by this inversion signal, and the output which has the width expanded is obtained as an alarm signal at terminal 20.
JP11138779A 1979-08-31 1979-08-31 Automatic frequency control alarm circuit Pending JPS5636233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11138779A JPS5636233A (en) 1979-08-31 1979-08-31 Automatic frequency control alarm circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11138779A JPS5636233A (en) 1979-08-31 1979-08-31 Automatic frequency control alarm circuit

Publications (1)

Publication Number Publication Date
JPS5636233A true JPS5636233A (en) 1981-04-09

Family

ID=14559883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11138779A Pending JPS5636233A (en) 1979-08-31 1979-08-31 Automatic frequency control alarm circuit

Country Status (1)

Country Link
JP (1) JPS5636233A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0261083A (en) * 1988-08-24 1990-03-01 Daiso Co Ltd Anode for generating oxygen and production thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0261083A (en) * 1988-08-24 1990-03-01 Daiso Co Ltd Anode for generating oxygen and production thereof

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