JPS57145442A - Low-frequency amplifying circuit - Google Patents
Low-frequency amplifying circuitInfo
- Publication number
- JPS57145442A JPS57145442A JP3183481A JP3183481A JPS57145442A JP S57145442 A JPS57145442 A JP S57145442A JP 3183481 A JP3183481 A JP 3183481A JP 3183481 A JP3183481 A JP 3183481A JP S57145442 A JPS57145442 A JP S57145442A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- circuit
- voltage
- amplifying circuit
- trs
- 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
- Electromechanical Clocks (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
PURPOSE: To facilitate the formation of an IC and at the same time to save the power consumption for a titled amplifying circuit, by using the transistors and resistors with a reduced number of capacitors.
CONSTITUTION: When the DC voltage is applied to a terminal 49, transistors TR50∼54 are turned on to actuate TRs 3, 5 and 6. Then the power is supplied to a radio receiving circuit 45 from a terminal 55 of the emitter side of the TR54, and the output wave detection signal given from the circuit 45 is amplified and transmitted through a speaker 25. When the DC voltage is cut to the terminal 49, no output voltage is delivered from the terminal 55 to cut the supply to the circuit 45. At the same time, no current flows to the TRs 3, 5 and 6. An alarm sound can be transmitted through the speaker 25 by applying the prescribed signal to a terminal 56 although the radio is not active.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3183481A JPS57145442A (en) | 1981-03-04 | 1981-03-04 | Low-frequency amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3183481A JPS57145442A (en) | 1981-03-04 | 1981-03-04 | Low-frequency amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57145442A true JPS57145442A (en) | 1982-09-08 |
Family
ID=12342091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3183481A Pending JPS57145442A (en) | 1981-03-04 | 1981-03-04 | Low-frequency amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57145442A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008215625A (en) * | 2008-05-16 | 2008-09-18 | Furukawa Techno Material Co Ltd | Method and filler for fire protection at penetrating section of inflammable long body |
| US8097310B2 (en) | 2003-02-07 | 2012-01-17 | 3M Innovative Properties Company | Firestop article with attachment surface |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226808U (en) * | 1975-08-14 | 1977-02-24 | ||
| JPS5525255A (en) * | 1978-08-10 | 1980-02-22 | Nec Corp | Amplifier |
| JPS5514381B2 (en) * | 1973-10-03 | 1980-04-16 |
-
1981
- 1981-03-04 JP JP3183481A patent/JPS57145442A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514381B2 (en) * | 1973-10-03 | 1980-04-16 | ||
| JPS5226808U (en) * | 1975-08-14 | 1977-02-24 | ||
| JPS5525255A (en) * | 1978-08-10 | 1980-02-22 | Nec Corp | Amplifier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8097310B2 (en) | 2003-02-07 | 2012-01-17 | 3M Innovative Properties Company | Firestop article with attachment surface |
| JP2008215625A (en) * | 2008-05-16 | 2008-09-18 | Furukawa Techno Material Co Ltd | Method and filler for fire protection at penetrating section of inflammable long body |
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