JPS54152919A - Auto-power-off circuit - Google Patents

Auto-power-off circuit

Info

Publication number
JPS54152919A
JPS54152919A JP6107078A JP6107078A JPS54152919A JP S54152919 A JPS54152919 A JP S54152919A JP 6107078 A JP6107078 A JP 6107078A JP 6107078 A JP6107078 A JP 6107078A JP S54152919 A JPS54152919 A JP S54152919A
Authority
JP
Japan
Prior art keywords
circuit
shift register
battery
signal
decision
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
JP6107078A
Other languages
Japanese (ja)
Inventor
Hitoyoshi Shudo
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 JP6107078A priority Critical patent/JPS54152919A/en
Publication of JPS54152919A publication Critical patent/JPS54152919A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prolong the lifetime of a battery by discriminating the count output of a shift register, by clearing the content of the shift register by an operation stop signal, and by using the decision output as an automatic power-off signal.
CONSTITUTION: Add-one circuit 2 is provided to the feedback loop of shift register 1 constituting a digital control circuit, and the count output of shift register 1 is sent to amplifier circuit 3 for amplification, thereby making a dicision by decision circuit 4. Here. the content of register 1 is cleared by an operation stop signal and circuits 2, 3 and 4 are operated periodically to use the decision output as an automatic power-off signal. Consequently, the lifetime of the battery of the digital control circuit driven by the battery can be prolonged.
COPYRIGHT: (C)1979,JPO&Japio
JP6107078A 1978-05-24 1978-05-24 Auto-power-off circuit Pending JPS54152919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6107078A JPS54152919A (en) 1978-05-24 1978-05-24 Auto-power-off circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6107078A JPS54152919A (en) 1978-05-24 1978-05-24 Auto-power-off circuit

Publications (1)

Publication Number Publication Date
JPS54152919A true JPS54152919A (en) 1979-12-01

Family

ID=13160505

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6107078A Pending JPS54152919A (en) 1978-05-24 1978-05-24 Auto-power-off circuit

Country Status (1)

Country Link
JP (1) JPS54152919A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4417135A (en) * 1979-05-28 1983-11-22 Olympus Optical Co., Ltd. Power saving electronic counter circuit for tape recorder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4957743A (en) * 1972-10-02 1974-06-05
JPS4978437A (en) * 1972-11-29 1974-07-29
JPS5046044A (en) * 1973-08-28 1975-04-24
JPS50161102A (en) * 1974-06-10 1975-12-26

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4957743A (en) * 1972-10-02 1974-06-05
JPS4978437A (en) * 1972-11-29 1974-07-29
JPS5046044A (en) * 1973-08-28 1975-04-24
JPS50161102A (en) * 1974-06-10 1975-12-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4417135A (en) * 1979-05-28 1983-11-22 Olympus Optical Co., Ltd. Power saving electronic counter circuit for tape recorder

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