JPS5498198A - Alarm circuit system - Google Patents
Alarm circuit systemInfo
- Publication number
- JPS5498198A JPS5498198A JP435478A JP435478A JPS5498198A JP S5498198 A JPS5498198 A JP S5498198A JP 435478 A JP435478 A JP 435478A JP 435478 A JP435478 A JP 435478A JP S5498198 A JPS5498198 A JP S5498198A
- Authority
- JP
- Japan
- Prior art keywords
- trq
- circuit
- detected
- alarm
- oscillation
- 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
- Emergency Alarm Devices (AREA)
Abstract
PURPOSE: To improve the sensitivity of alarm system by constituting a circuit in which an alarm is generated by ocillating an oscillation circuit only when the detection circuit functions.
CONSTITUTION: When there is no resisting body to be detected such as for example water leakage between the pair of sensors, Darlington connected detecting transistors TRQ2 and Q3 are "OFF" and, therefore, the base current does not flow through oscillation transistor TRQ1, which is functioning as a load in portion of the primary side of transformer and, consequently, there is no oscillation. However, when there is a resisting body between sensors, TRQ2 and Q3 are turned "ON", base current flows through TRQ1, the main circcuit oscillates as a blocking circuit and alarm is is given form speaker SP. Since this circuit amplifies even when the current is very weak, a resisting body of even very high resistance can be detected. When the resistance of body to be detected is comparatively low, one transisitor can be used instead of Darlington connection.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP435478A JPS5498198A (en) | 1978-01-20 | 1978-01-20 | Alarm circuit system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP435478A JPS5498198A (en) | 1978-01-20 | 1978-01-20 | Alarm circuit system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5498198A true JPS5498198A (en) | 1979-08-02 |
Family
ID=11582058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP435478A Pending JPS5498198A (en) | 1978-01-20 | 1978-01-20 | Alarm circuit system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5498198A (en) |
-
1978
- 1978-01-20 JP JP435478A patent/JPS5498198A/en active Pending
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