CN204596068U - A kind of frost warning circuit - Google Patents
A kind of frost warning circuit Download PDFInfo
- Publication number
- CN204596068U CN204596068U CN201520185730.3U CN201520185730U CN204596068U CN 204596068 U CN204596068 U CN 204596068U CN 201520185730 U CN201520185730 U CN 201520185730U CN 204596068 U CN204596068 U CN 204596068U
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- Prior art keywords
- triode
- dry cell
- cell batteries
- operational amplifier
- warning circuit
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Abstract
The utility model discloses a kind of frost warning circuit, comprise dry cell batteries, operational amplifier, slide rheostat, thermistor, first, second triode, speech chip and loudspeaker, the positive pole of dry cell batteries is connected with the positive input terminal of operational amplifier by resistance, the positive pole of dry cell batteries is also connected with one end of slide rheostat by resistance, the adjustable side of slide rheostat is connected with the negative input end of operational amplifier, the other end of slide rheostat is connected with the negative pole of dry cell batteries by thermistor, the output terminal of operational amplifier is connected by the base stage of current-limiting resistance with the first triode, the collector of the first triode is connected by the base stage of current-limiting resistance with the second triode, the collector of the second triode is connected with the input end of speech chip, the output terminal of speech chip is connected with the negative pole of dry cell batteries by loudspeaker.The clever density that the utility model can regulate frost to report to the police, circuit is simple, has a good application prospect.
Description
Technical field
The utility model relates to a kind of frost warning circuit, belongs to electronic circuit technology field.
Background technology
In agricultural production, frost is the key factor of normal growth of harming the crops, and therefore, very important to the early warning of frost, at present, for the frost alarm of crops, circuit is too complicated, and cost is higher, and sensitivity can not regulate, and uses inconvenience.
Utility model content
The technical matters that the utility model solves overcomes the existing frost alarm for crops, and circuit is too complicated, and cost is higher, and sensitivity can not regulate, inconvenient problem with use.Frost warning circuit of the present utility model, can regulate the clever density that frost is reported to the police, easy to use, and circuit is simple, easily realizes, has a good application prospect.
To achieve the above object, the technical scheme that adopts of the utility model is as follows:
A kind of frost warning circuit, it is characterized in that: comprise dry cell batteries GB, operational amplifier IC1, slide rheostat RP, thermistor RT, first triode Q1, second triode Q2, speech chip IC2 and loudspeaker BL, the positive pole of described dry cell batteries GB is connected with the positive input terminal of operational amplifier IC1 by resistance R1, the positive pole of described dry cell batteries GB is also connected with one end of slide rheostat RP by resistance R2, the adjustable side of described slide rheostat RP is connected with the negative input end of operational amplifier IC1, the other end of described slide rheostat RP is connected with the negative pole of dry cell batteries GB by thermistor RT, the output terminal of described operational amplifier IC1 is connected with the base stage of the first triode Q1 by current-limiting resistance R3, the emitter of described first triode Q1 is connected with the positive pole of dry cell batteries GB, the collector of described first triode Q1 is connected with the base stage of the second triode Q2 by current-limiting resistance R4, the collector of described second triode Q2 is connected with the input end of speech chip IC2, the emitter of described second triode Q2 is connected with the negative pole of dry cell batteries GB, the collector of described first triode Q1 is also connected with the negative pole of dry cell batteries GB by light emitting diode D1, the output terminal of described speech chip IC2 is connected with the negative pole of dry cell batteries GB by loudspeaker BL.
Aforesaid a kind of frost warning circuit, is characterized in that: the voltage of described dry cell batteries GB is 12V, and the positive pole of described dry cell batteries GB is in series with switch S.
Aforesaid a kind of frost warning circuit, is characterized in that: described dry cell batteries GB positive and negative electrode is connected with the positive and negative power input of operational amplifier IC1 respectively.
Aforesaid a kind of frost warning circuit, is characterized in that: the positive input terminal of described operational amplifier IC1 is also connected with the negative pole of dry cell batteries GB by resistance R5.
Aforesaid a kind of frost warning circuit, is characterized in that: described first triode Q1 is PNP triode, and described second triode Q2 is NPN triode.
Aforesaid a kind of frost warning circuit, is characterized in that: described speech chip IC2 is KD9562B voice integrated chips.
Aforesaid a kind of frost warning circuit, is characterized in that: described operational amplifier IC1 is LM324 operational amplifier.
The beneficial effects of the utility model are: frost warning circuit of the present utility model, can regulate the clever density that frost is reported to the police, easy to use, and circuit is simple, easily realizes, with low cost, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of frost warning circuit of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
As shown in Fig. 1, a kind of frost warning circuit, comprise dry cell batteries GB, operational amplifier IC1, slide rheostat RP, thermistor RT, first triode Q1, second triode Q2, speech chip IC2 and loudspeaker BL, the positive pole of described dry cell batteries GB is connected with the positive input terminal of operational amplifier IC1 by resistance R1, the positive pole of described dry cell batteries GB is also connected with one end of slide rheostat RP by resistance R2, the adjustable side of described slide rheostat RP is connected with the negative input end of operational amplifier IC1, the other end of described slide rheostat RP is connected with the negative pole of dry cell batteries GB by thermistor RT, the output terminal of described operational amplifier IC1 is connected with the base stage of the first triode Q1 by current-limiting resistance R3, the emitter of described first triode Q1 is connected with the positive pole of dry cell batteries GB, the collector of described first triode Q1 is connected with the base stage of the second triode Q2 by current-limiting resistance R4, the collector of described second triode Q2 is connected with the input end of speech chip IC2, the emitter of described second triode Q2 is connected with the negative pole of dry cell batteries GB, the collector of described first triode Q1 is also connected with the negative pole of dry cell batteries GB by light emitting diode D1, the output terminal of described speech chip IC2 is connected with the negative pole of dry cell batteries GB by loudspeaker BL.
The voltage of described dry cell batteries GB is 12V, the positive pole of described dry cell batteries GB is in series with switch S, dry cell batteries GB positive and negative electrode is connected with the positive and negative power input of operational amplifier IC1 respectively, the positive input terminal of operational amplifier IC1 is also connected with the negative pole of dry cell batteries GB by resistance R5, first triode Q1 is PNP triode, described second triode Q2 is NPN triode, and speech chip IC2 is KD9562B voice integrated chips, and operational amplifier IC1 is LM324 operational amplifier.
Frost warning circuit principle of work of the present utility model is as follows, after switch S is pressed, when crops free of frost, thermistor RT is in low resistance state, and the positive input of operational amplifier IC1 is higher than the voltage of reverse input end, operational amplifier IC1 output HIGH voltage, first triode Q1, the second triode Q2 are in cut-off state, and light emitting diode D1 does not work, and speech chip IC2 does not output signal, do not work, loudspeaker BL not sounding, when there is frost phenomenon in crops, thermistor RT is in high-impedance state, the low voltage with reverse input end of the positive input of operational amplifier IC1, operational amplifier IC1 output LOW voltage, first triode Q1, second triode Q2 is in equal conducting, light emitting diode D1 lights, there is output signal in speech chip IC2, carry out work, loudspeaker BL sounding, reminding user makes frost protection measure, user can also pass through slide rheostat RP, regulate the state of operational amplifier IC1 output low level, regulate the warning sensitivity of frost warning circuit, easy to use, circuit is simple, easy realization, with low cost, have a good application prospect.
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (7)
1. a frost warning circuit, it is characterized in that: comprise dry cell batteries GB, operational amplifier IC1, slide rheostat RP, thermistor RT, first triode Q1, second triode Q2, speech chip IC2 and loudspeaker BL, the positive pole of described dry cell batteries GB is connected with the positive input terminal of operational amplifier IC1 by resistance R1, the positive pole of described dry cell batteries GB is also connected with one end of slide rheostat RP by resistance R2, the adjustable side of described slide rheostat RP is connected with the negative input end of operational amplifier IC1, the other end of described slide rheostat RP is connected with the negative pole of dry cell batteries GB by thermistor RT, the output terminal of described operational amplifier IC1 is connected with the base stage of the first triode Q1 by current-limiting resistance R3, the emitter of described first triode Q1 is connected with the positive pole of dry cell batteries GB, the collector of described first triode Q1 is connected with the base stage of the second triode Q2 by current-limiting resistance R4, the collector of described second triode Q2 is connected with the input end of speech chip IC2, the emitter of described second triode Q2 is connected with the negative pole of dry cell batteries GB, the collector of described first triode Q1 is also connected with the negative pole of dry cell batteries GB by light emitting diode D1, the output terminal of described speech chip IC2 is connected with the negative pole of dry cell batteries GB by loudspeaker BL.
2. a kind of frost warning circuit according to claim 1, is characterized in that: the voltage of described dry cell batteries GB is 12V, and the positive pole of described dry cell batteries GB is in series with switch S.
3. a kind of frost warning circuit according to claim 1, is characterized in that: described dry cell batteries GB positive and negative electrode is connected with the positive and negative power input of operational amplifier IC1 respectively.
4. a kind of frost warning circuit according to claim 1, is characterized in that: the positive input terminal of described operational amplifier IC1 is also connected with the negative pole of dry cell batteries GB by resistance R5.
5. a kind of frost warning circuit according to claim 1, is characterized in that: described first triode Q1 is PNP triode, and described second triode Q2 is NPN triode.
6. a kind of frost warning circuit according to claim 1, is characterized in that: described speech chip IC2 is KD9562B voice integrated chips.
7. a kind of frost warning circuit according to claim 1, is characterized in that: described operational amplifier IC1 is LM324 operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520185730.3U CN204596068U (en) | 2015-03-31 | 2015-03-31 | A kind of frost warning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520185730.3U CN204596068U (en) | 2015-03-31 | 2015-03-31 | A kind of frost warning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204596068U true CN204596068U (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520185730.3U Expired - Fee Related CN204596068U (en) | 2015-03-31 | 2015-03-31 | A kind of frost warning circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204596068U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794849A (en) * | 2015-03-31 | 2015-07-22 | 苏州锟恩电子科技有限公司 | Frost alarm circuit |
-
2015
- 2015-03-31 CN CN201520185730.3U patent/CN204596068U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794849A (en) * | 2015-03-31 | 2015-07-22 | 苏州锟恩电子科技有限公司 | Frost alarm circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 Termination date: 20160331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |