CN206656777U - Simple water-level alarm - Google Patents
Simple water-level alarm Download PDFInfo
- Publication number
- CN206656777U CN206656777U CN201720324926.5U CN201720324926U CN206656777U CN 206656777 U CN206656777 U CN 206656777U CN 201720324926 U CN201720324926 U CN 201720324926U CN 206656777 U CN206656777 U CN 206656777U
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- China
- Prior art keywords
- resistance
- hard contact
- electric capacity
- amplifier
- amplifier chip
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- Expired - Fee Related
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Abstract
Simple water-level alarm, belong to water level monitoring alarm technique field.The utility model is complicated in order to solve existing water level alarm, and the problem of easily disturbed by outer signals.It is provided with hard contact A and hard contact B as water level monitoring point, amplifier Q1 backward end and ground is turned on, reverse terminal potential remains 0；Below water level decreasing to contact, electric capacity C1 accesses circuit, form the square wave generation circuit built by amplifier, square-wave pulse is back and forth formed by the output end voltage of amplifier back and forth, coordinate the conducting and cut-off of triode again, the square wave of drive the speaker is produced, loudspeaker sounding shakes, and reaches the purpose of alarm.The utility model is used for water level monitoring.
Description
Technical field
Simple water-level alarm is the utility model is related to, belongs to water level monitoring alarm technique field.
Background technology
Traditional water level alarm come the situation of sensed water level, not only needs to judge typically using buoy and lever principle
Circuit, it is also necessary to which extra square wave generation circuit drives emergency alarm bell or alarm flashing light.Therefore traditional water level alarm knot
Structure is complicated, cumbersome for installation, and easily by external interference.
The content of the invention
The purpose of the utility model is complicated in order to solve existing water level alarm, and is easily asked by outer signals interference
A kind of topic, there is provided Simple water-level alarm.
Simple water-level alarm described in the utility model, it includes hard contact A, hard contact B, amplifier chip Q1, NPN
Triode S1, loudspeaker K1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2 and electricity
Hold C3,
In hard contact A and hard contact B insertion water, make to correspond to warning line during conducting；
Hard contact A connection amplifier chips Q1 inverting input, hard contact B ground connection；Hard contact B and amplifier chip
Resistance R1 is connected between Q1 in-phase input end, electric capacity C1 is connected between hard contact A and hard contact B, amplifier chip Q1's
Resistance R3 is connected between inverting input and output end, resistance is connected between amplifier chip Q1 in-phase input end and output end
R2；Amplifier chip Q1 positive pole feeder ear passes through resistance R4 connection+12V power supplys, amplifier chip Q1 positive pole feeder ear connection electricity
Hold C2 one end, electric capacity C2 other end ground connection；Amplifier chip Q1 negative pole feeder ear passes through resistance R5 connection -12V power supplys, fortune
Put chip Q1 negative pole feeder ear connection electric capacity C3 one end, electric capacity C3 other end ground connection；Amplifier chip Q1 output end with
Connection resistance R6 between NPN triode S1 base stage, NPN triode S1 colelctor electrode connection+12V power supplys, NPN triode S1's
Emitter stage connection loudspeaker K1 one end, loudspeaker K1 other end ground connection.
The advantages of the utility model：The utility model will detect circuit and square wave drive circuit is combined and carries out water level report
Alert, its circuit structure is simple, stable performance.It is provided with hard contact A and hard contact B as water level monitoring point, by amplifier
Q1 backward end turns on ground, and reverse terminal potential remains 0.Below water level decreasing to contact, electric capacity C1 access circuits,
The square wave generation circuit built by amplifier is formed, square-wave pulse is back and forth formed by the output end voltage of amplifier back and forth, then coordinate
The conducting and cut-off of triode, the square wave of drive the speaker is produced, loudspeaker sounding shakes, and reaches the purpose of alarm.
The utility model is convenient to be installed, and dependable performance, is not disturbed by outer signals, and all conducting liquids are applicable.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of Simple water-level alarm described in the utility model.
Embodiment
Embodiment one：Illustrate present embodiment, Simple water-level alarm described in present embodiment with reference to Fig. 1
Device, it includes hard contact A, hard contact B, amplifier chip Q1, NPN triode S1, loudspeaker K1, resistance R1, resistance R2, electricity
R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2 and electric capacity C3 are hindered,
In hard contact A and hard contact B insertion water, make to correspond to warning line during conducting；
Hard contact A connection amplifier chips Q1 inverting input, hard contact B ground connection；Hard contact B and amplifier chip
Resistance R1 is connected between Q1 in-phase input end, electric capacity C1 is connected between hard contact A and hard contact B, amplifier chip Q1's
Resistance R3 is connected between inverting input and output end, resistance is connected between amplifier chip Q1 in-phase input end and output end
R2；Amplifier chip Q1 positive pole feeder ear passes through resistance R4 connection+12V power supplys, amplifier chip Q1 positive pole feeder ear connection electricity
Hold C2 one end, electric capacity C2 other end ground connection；Amplifier chip Q1 negative pole feeder ear passes through resistance R5 connection -12V power supplys, fortune
Put chip Q1 negative pole feeder ear connection electric capacity C3 one end, electric capacity C3 other end ground connection；Amplifier chip Q1 output end with
Connection resistance R6 between NPN triode S1 base stage, NPN triode S1 colelctor electrode connection+12V power supplys, NPN triode S1's
Emitter stage connection loudspeaker K1 one end, loudspeaker K1 other end ground connection.
Embodiment two：Present embodiment is described further to embodiment one, resistance R1 and resistance R2 resistance
It is worth equal.
Operation principle：
Amplifier chip Q1 feeder ear can export generating positive and negative voltage by+- 12V power supplys power supply, guarantee amplifier in output end,
And positive-negative power power supply can ensure the steady operation of amplifier.Resistance R4 and resistance R5 is current-limiting resistance, electric capacity C2 and electric capacity C3
With filter action, the stabilization of amplifier operating voltage can be protected.R6 is transistor base resistance, limits its base current.
Hard contact A, B are inserted in water.When water level did not had contact, contact A, B conductings, short circuit capacitance C1.This luck
The reverse input end and ground for putting Q1 turn on, and reverse terminal potential remains 0.Ensure that reverse terminal potential is less than or equal to same phase
Terminal potential, then amplifier output end voltage do not overturn, output voltage is always+U0, and transistor base voltage is+U0.Because raise one's voice
Device sounding needs the driving of square-wave signal, so in the case where voltage is not overturn, triode turns on all the time, and loudspeaker is only just
Voltage constant pressure drives, and sounding sound, does not alarm.
When below water level decreasing to hard contact, A, B contact is disconnected, and electric capacity C1 is connected in circuit.Amplifier chip
Q1 circuit output terminal voltage only has two states, equal in magnitude, and symbol is on the contrary, be+- U0.Assuming that now amplifier output end is electric
Press as+U0, then output end gives C1 to charge by resistance R3.During continuous charging, the reverse terminal voltage of amplifier improves constantly.
The voltage of the in-phase end of amplifier is the voltage after resistance R1 and R2 partial pressure.When R1 is equal with R2, in-phase end voltage is defeated
Go out the half of voltage, be 1/2U0.When electric capacity C1 constantly charges, and reverse terminal voltage is increased to higher than in-phase end voltage, then amplifier
Output voltage is overturn, and output voltage becomes negative voltage-U0.At the same time in-phase end voltage is changed into -1/2U0.Electric capacity C1
To be discharged by resistance R3, reverse terminal voltage is gradually reduced, when dropping to also smaller than in-phase end voltage -1/2U0, amplifier output electricity
Pressure is overturn again, then back and forth forms square-wave pulse back and forth.Transistor base voltage also it is positive and negative it is reciprocal change, when for
During positive voltage, triode ON, when voltage is bears, triode cut-off.Therefore the square wave of drive the speaker, loudspeaker are generated
Sounding shakes, and reaches the purpose of alarm.
Claims (2)
1. a kind of Simple water-level alarm, it is characterised in that it includes hard contact A, hard contact B, amplifier chip Q1, NPN
Triode S1, loudspeaker K1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2 and electricity
Hold C3,
In hard contact A and hard contact B insertion water, make to correspond to warning line during conducting；
Hard contact A connection amplifier chips Q1 inverting input, hard contact B ground connection；Hard contact B and amplifier chip Q1's
Resistance R1 is connected between in-phase input end, electric capacity C1 is connected between hard contact A and hard contact B, amplifier chip Q1's is anti-phase
Resistance R3 is connected between input and output end, resistance R2 is connected between amplifier chip Q1 in-phase input end and output end；Fortune
The positive pole feeder ear for putting chip Q1 connects electric capacity C2's by resistance R4 connection+12V power supplys, amplifier chip Q1 positive pole feeder ear
One end, electric capacity C2 other end ground connection；Amplifier chip Q1 negative pole feeder ear passes through resistance R5 connection -12V power supplys, amplifier chip
Q1 negative pole feeder ear connection electric capacity C3 one end, electric capacity C3 other end ground connection；Amplifier chip Q1 output end and the poles of NPN tri-
Resistance R6, NPN triode S1 colelctor electrode connection+12V power supplys, NPN triode S1 emitter stage are connected between pipe S1 base stage
Connect loudspeaker K1 one end, loudspeaker K1 other end ground connection.
2. Simple water-level alarm according to claim 1, it is characterised in that resistance R1 and resistance R2 resistance are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720324926.5U CN206656777U (en) | 2017-03-30 | 2017-03-30 | Simple water-level alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720324926.5U CN206656777U (en) | 2017-03-30 | 2017-03-30 | Simple water-level alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206656777U true CN206656777U (en) | 2017-11-21 |
Family
ID=60316626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720324926.5U Expired - Fee Related CN206656777U (en) | 2017-03-30 | 2017-03-30 | Simple water-level alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206656777U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609901A (en) * | 2020-05-24 | 2020-09-01 | 哈尔滨理工大学 | High-precision short-distance ultrasonic liquid level measuring device |
| CN113639826A (en) * | 2021-07-20 | 2021-11-12 | 山东大学 | Septic tank liquid level overflow detection device |
-
2017
- 2017-03-30 CN CN201720324926.5U patent/CN206656777U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609901A (en) * | 2020-05-24 | 2020-09-01 | 哈尔滨理工大学 | High-precision short-distance ultrasonic liquid level measuring device |
| CN113639826A (en) * | 2021-07-20 | 2021-11-12 | 山东大学 | Septic tank liquid level overflow detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171121 Termination date: 20180330 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |