JPS5678249A - Operation indicator circuit - Google Patents

Operation indicator circuit

Info

Publication number
JPS5678249A
JPS5678249A JP15416879A JP15416879A JPS5678249A JP S5678249 A JPS5678249 A JP S5678249A JP 15416879 A JP15416879 A JP 15416879A JP 15416879 A JP15416879 A JP 15416879A JP S5678249 A JPS5678249 A JP S5678249A
Authority
JP
Japan
Prior art keywords
voltage
battery
remote control
drop
constant
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
JP15416879A
Other languages
Japanese (ja)
Inventor
Yasuhiro Kasahara
Tsugio Itagaki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15416879A priority Critical patent/JPS5678249A/en
Publication of JPS5678249A publication Critical patent/JPS5678249A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Selective Calling Equipment (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To indicate accurately the time when the battery should be replaced, by detecting a drop in across voltage of the battery by indicating whether the operation of the device is within a normal range or not without reference to the drop directly. CONSTITUTION:Pulse generator 1 generates pulse strings corresponding to remote control operation and constant-current driving transistor TR7 is controlled with the pulse strings. This TR7 is turned on at a constant voltage by the conduction voltage determined by bias-voltage setting diodes 3 and 4. Without reference to slight fluctuations of the voltage across power battery 20, this TR7 drives infrared- ray emitting diodes 5 and 6 with constant current to transmit accurately a remote control signal by infrared rays. Then, TR18 is controlled by being applied at the base with pulses from generator 1 to drive voltage comparing switching TR15 and while normal operation is carried out with prescribed-value driving current to diodes 5 and 6, light emitting diode 14 is turned on every time the remote control signal is outputted, thereby detecting a voltage drop of battery 20 by the off-operation of diode 14.
JP15416879A 1979-11-30 1979-11-30 Operation indicator circuit Pending JPS5678249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15416879A JPS5678249A (en) 1979-11-30 1979-11-30 Operation indicator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15416879A JPS5678249A (en) 1979-11-30 1979-11-30 Operation indicator circuit

Publications (1)

Publication Number Publication Date
JPS5678249A true JPS5678249A (en) 1981-06-27

Family

ID=15578311

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15416879A Pending JPS5678249A (en) 1979-11-30 1979-11-30 Operation indicator circuit

Country Status (1)

Country Link
JP (1) JPS5678249A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61294083A (en) * 1985-06-20 1986-12-24 三和シヤツタ−工業株式会社 Remote-control transmitter for electric shutter
FR2637714A1 (en) * 1988-03-25 1990-04-13 N Proizv Ob Tulatschermet TRANSPORTABLE REMOTE CONTROL UNIT
BE1002541A5 (en) * 1988-10-13 1991-03-19 Np Ob Sozdaniju I Vypusku Sred Portable remote control console

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61294083A (en) * 1985-06-20 1986-12-24 三和シヤツタ−工業株式会社 Remote-control transmitter for electric shutter
FR2637714A1 (en) * 1988-03-25 1990-04-13 N Proizv Ob Tulatschermet TRANSPORTABLE REMOTE CONTROL UNIT
BE1002541A5 (en) * 1988-10-13 1991-03-19 Np Ob Sozdaniju I Vypusku Sred Portable remote control console

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