JPS562019A - Constant electric current source circuit - Google Patents
Constant electric current source circuitInfo
- 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
Links
Landscapes
- 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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01255547A (en) * | 1988-04-05 | 1989-10-12 | Ricoh Co Ltd | Liquid injection recording head and recording method using it |
-
1979
- 1979-06-20 JP JP7944679A patent/JPS562019A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01255547A (en) * | 1988-04-05 | 1989-10-12 | Ricoh Co Ltd | Liquid injection recording head and recording method using it |
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