JPS54124248A - Constant-voltage circuit with reset signal generating circuit - Google Patents
Constant-voltage circuit with reset signal generating circuitInfo
- Publication number
- JPS54124248A JPS54124248A JP3186478A JP3186478A JPS54124248A JP S54124248 A JPS54124248 A JP S54124248A JP 3186478 A JP3186478 A JP 3186478A JP 3186478 A JP3186478 A JP 3186478A JP S54124248 A JPS54124248 A JP S54124248A
- Authority
- JP
- Japan
- Prior art keywords
- zener
- reset signal
- voltage
- transistor
- electric source
- 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 generate a reliable reset signal using a simple construction, by controlling a transistor for generating a reset signal using Zener current, a condenser and a resistance used in a constant-voltage circuit.
CONSTITUTION: When an electric source voltage Vin is energized, an electric potential of a condenser C2 is elevated through a resistance R2, and an electric potential of a base of a controlling transistor Tr1 is elevated to provide an output voltage Vout which is approximately equal to the electric source voltage Vin. When the electric source voltage is further elevated to reach a Zener voltage Vz of a Zener diode ZD, Zener current flows to a transistor Tr2 to suppress further elevation of the electric potential of the condenser C2, so that the output voltage Vout is remained approximately equal to the Zener voltage Vz. When the electric source voltage is lowered below the Zener voltage Vz, the Zener current passing through the Zener diode ZD is cut so that the transistor Tr2 for generating a reset signal becomes nonconductive and generates a reset signal as shown in the drawing by a dotted line.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3186478A JPS54124248A (en) | 1978-03-20 | 1978-03-20 | Constant-voltage circuit with reset signal generating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3186478A JPS54124248A (en) | 1978-03-20 | 1978-03-20 | Constant-voltage circuit with reset signal generating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54124248A true JPS54124248A (en) | 1979-09-27 |
Family
ID=12342907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3186478A Pending JPS54124248A (en) | 1978-03-20 | 1978-03-20 | Constant-voltage circuit with reset signal generating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54124248A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS573115A (en) * | 1980-06-06 | 1982-01-08 | Nippon Columbia Co Ltd | Detecting circuit for output voltage of constant-voltage circuit |
-
1978
- 1978-03-20 JP JP3186478A patent/JPS54124248A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS573115A (en) * | 1980-06-06 | 1982-01-08 | Nippon Columbia Co Ltd | Detecting circuit for output voltage of constant-voltage circuit |
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