JPS562019A - Constant electric current source circuit - Google Patents

Constant electric current source circuit

Info

Publication number
JPS562019A
JPS562019A JP7944679A JP7944679A JPS562019A JP S562019 A JPS562019 A JP S562019A JP 7944679 A JP7944679 A JP 7944679A JP 7944679 A JP7944679 A JP 7944679A JP S562019 A JPS562019 A JP S562019A
Authority
JP
Japan
Prior art keywords
amplifier
circuit
resistance
electric power
voltage
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
JP7944679A
Other languages
Japanese (ja)
Inventor
Yuji Furukubo
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 JP7944679A priority Critical patent/JPS562019A/en
Publication of JPS562019A publication Critical patent/JPS562019A/en
Pending legal-status Critical Current

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  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE: To improve operation precision by putting a constant current circuit into operation only by an electric power source whose one terminal is grounded, by providing a level shifting circuit between an operational amplifier and inpedance converter and then by feeding the output of this circuit back negatively to the operational amplifier.
CONSTITUTION: Control resistance E is applied to the uninverted input terminal of operational amplifier 5 via resistance r1, and to the inverted input terminal of amplifier 5, electric power voltage Er is applied being voltage-divided by resistances r3 and r4. At the output of the amplifier 5, a shifting circuit is provided which consists of Zener diode 6 shifting a DC level; an output shifted by the diode 6 is current-amplified by transistors (TR)8, 9 constituting a Darlington-connected impedance converter and voltage Ee is negatively fed back to the uninverted input terminal of amplifier 5 through resistance r2. Then, resistance r6 is supplied with a constant current and electric power voltage Er with one terminal grounded is used for the constant current circuit, thereby improving the operation precision.
COPYRIGHT: (C)1981,JPO&Japio
JP7944679A 1979-06-20 1979-06-20 Constant electric current source circuit Pending JPS562019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7944679A JPS562019A (en) 1979-06-20 1979-06-20 Constant electric current source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7944679A JPS562019A (en) 1979-06-20 1979-06-20 Constant electric current source circuit

Publications (1)

Publication Number Publication Date
JPS562019A true JPS562019A (en) 1981-01-10

Family

ID=13690099

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7944679A Pending JPS562019A (en) 1979-06-20 1979-06-20 Constant electric current source circuit

Country Status (1)

Country Link
JP (1) JPS562019A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01255547A (en) * 1988-04-05 1989-10-12 Ricoh Co Ltd Liquid jet recording head and recording method using the head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01255547A (en) * 1988-04-05 1989-10-12 Ricoh Co Ltd Liquid jet recording head and recording method using the head

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