JPS6432709A - Constant current source circuit - Google Patents
Constant current source circuitInfo
- Publication number
- JPS6432709A JPS6432709A JP62187579A JP18757987A JPS6432709A JP S6432709 A JPS6432709 A JP S6432709A JP 62187579 A JP62187579 A JP 62187579A JP 18757987 A JP18757987 A JP 18757987A JP S6432709 A JPS6432709 A JP S6432709A
- Authority
- JP
- Japan
- Prior art keywords
- current source
- constant current
- current
- anode
- diode
- 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
Abstract
PURPOSE:To control the current value of a constant current source by means of an external impressed voltage and to cause a testing to be efficient by connecting the series circuit of two resistances to the anode of a diode and connecting the base of a transistor to the anode of the diode to control a current value of a constant source current by the external impressing voltage. CONSTITUTION:To the anode of a diode D1, a circuit, composed of two series- connected resistances R1 and R2, is connected. When the constant current source to supply Ib=1.5mA is designed, provided that R1=2.702KOMEGA, R2=0.270KOMEGA, a voltage V1 of nodes between the resistance R1 and R2 does to be V1=1.147V. When the current Ib=1.5mA is controlled from the outside and changed to a two-fold designed value (Ib=3.0mA), since Vbe=Vd=760mA and R2=0.270KOMEGA, V1=1.570V may be executed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62187579A JPS6432709A (en) | 1987-07-29 | 1987-07-29 | Constant current source circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62187579A JPS6432709A (en) | 1987-07-29 | 1987-07-29 | Constant current source circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6432709A true JPS6432709A (en) | 1989-02-02 |
Family
ID=16208576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62187579A Pending JPS6432709A (en) | 1987-07-29 | 1987-07-29 | Constant current source circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6432709A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003008350A (en) * | 2001-06-19 | 2003-01-10 | Takehiko Adachi | Piezoelectric oscillator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58119014A (en) * | 1982-01-11 | 1983-07-15 | Matsushita Electric Ind Co Ltd | Power source device |
-
1987
- 1987-07-29 JP JP62187579A patent/JPS6432709A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58119014A (en) * | 1982-01-11 | 1983-07-15 | Matsushita Electric Ind Co Ltd | Power source device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003008350A (en) * | 2001-06-19 | 2003-01-10 | Takehiko Adachi | Piezoelectric oscillator |
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