CN201926509U - Temperature alarm - Google Patents
Temperature alarm Download PDFInfo
- Publication number
- CN201926509U CN201926509U CN2010206628416U CN201020662841U CN201926509U CN 201926509 U CN201926509 U CN 201926509U CN 2010206628416 U CN2010206628416 U CN 2010206628416U CN 201020662841 U CN201020662841 U CN 201020662841U CN 201926509 U CN201926509 U CN 201926509U
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- China
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- audio
- base circuit
- power amplifier
- time base
- capacitor
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- Expired - Fee Related
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Abstract
The utility model provides a temperature alarm, which is characterized in that a potentiometer is serially connected with a first resistor and then is connected with the second end of a time-base circuit, the second end of the time-base circuit is connected with a thermistor and then is connected to the first end of the time-base circuit, and the second end of the time-base circuit is serially connected with a first capacitor and then is connected with the fifth end of the time-base circuit; the third end of the time-base circuit is connected with a sound integrated circuit through a diode and is connected to the cathode of a power supply through a second capacitor; and the output port of the sound integrated circuit is connected with the second end of an audio power amplifier through a third capacitor, the fourth end and the fifth end of the audio power amplifier are connected to the cathode of the power supply, the first end of the audio power amplifier is connected with the third end of the audio power amplifier through a fourth capacitor, the third end of the audio power amplifier is connected to the cathode of the power supply through a fifth capacitor, and moreover, the third end of the audio power amplifier is connected with a loudspeaker through a sixth capacitor and then is connected with the cathode of the power supply. The anode of the power supply is connected with a seventh capacitor through a switch and then is grounded. The temperature alarm has the advantages of high sensitivity, high stability and timely alarm.
Description
Technical field
The utility model belongs to electronic technology field, is specifically related to a kind of temperature alarm.
Background technology
Because traditional thermometer is to change according to expanding with heat and contract with cold of liquid to show different volumes, thereby express different temperature, therefore reading very accurately, and want to see temperature, just must be handy transparent, splendid attire mercury and so on bigger liquid of expanded by heating coefficient in the good material of thermal conductivity, and this material category is few, and be poisonous as the liquid of this class of mercury, in case reveal the generation that will cause poisoning, and the day for human beings of now poisoning because of this metalloid is cumulative many, but some time and some people's work must be used thermometer, so just selected this a kind of technology to solve the inconvenience that this traditional problem brings, not only can make live and work become convenient, and can improve people's living environment, promote society to Green Development.
Summary of the invention
The purpose of this utility model provides a kind of temperature alarm, and existing the thermometer purposes is single can only measure the shortcoming that can not report to the police to overcome.
The technical solution adopted in the utility model is that a kind of temperature alarm comprises time base circuit IC1, audio ic IC2 and audio-frequency power amplifier IC3; Potentiometer Rp is connected the 2nd end of time base circuit IC1 with first resistance R, 1 series connection back, the 2nd end of time base circuit IC1 and the 1st end that connects after thermistor RT is connected to time base circuit IC1, and be connected the 5th end of time base circuit IC1 with first capacitor C 1 series connection back, the 6th end of time base circuit IC1 all is connected second resistance R 2 with the 7th end, and the 4th end of time base circuit IC1 all is connected potentiometer Rp with the 8th end; The 3rd end of time base circuit IC1 is connected with audio ic IC2 through a diode VD, and is connected to power cathode through second capacitor C 2; The output port of audio ic IC2 connects the 2nd end of audio-frequency power amplifier IC3 through the 3rd capacitor C 3, the 4th end and the 5th end of audio-frequency power amplifier IC3 all are connected to power cathode, the 1st end of audio-frequency power amplifier IC3 connects the 3rd end of audio-frequency power amplifier IC3 through the 4th capacitor C 4, and the 3rd end of audio-frequency power amplifier IC3 is connected to power cathode through the 5th capacitor C 5, in addition through the 6th capacitor C 6 with after loudspeaker B is connected, link to each other with the negative pole of power supply again.The positive pole of power supply is connected back ground connection through switch S with the 7th capacitor C 7.
The beneficial effects of the utility model are not only can be placed on indoor or other want to control at any time the place of temperature, and overcome the conventional temperature meter can not be than a difficult problem of working under the rugged environment.This technical support is provided with minimum and the highest alarm temperature restriction, can after surpassing restriction, give the alarm to the user in time, convenient people are to the real-time control of temperature, and because the Presentation Function of the numeral that it was equipped with has also solved the not accurate and difficult problem of reading of traditional temperature reading well.And the most tellable be its security, what its used is sensor, can not produce big consequence because of misoperation, and the 5V DC voltage of using not only is easy to get but also be foolproof.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure, IC1. time base circuit, IC2. audio ic, IC3. audio-frequency power amplifier, Rp. potentiometer, RT. thermistor, VD. diode, R1. first resistance, R2. second resistance, C1. first electric capacity, C2. second electric capacity, C3. the 3rd electric capacity, C4. the 4th electric capacity, C5. the 5th electric capacity, C6. the 6th electric capacity, C7. the 7th electric capacity, B. loudspeaker, S. switch.
Embodiment
As shown in Figure 1, the utility model provides a kind of temperature alarm, comprises time base circuit IC1, audio ic IC2 and audio-frequency power amplifier IC3; Potentiometer Rp is connected the 2nd end of time base circuit IC1 with first resistance R, 1 series connection back, the 2nd end of time base circuit IC1 and the 1st end that connects after thermistor RT is connected to time base circuit IC1, and be connected the 5th end of time base circuit IC1 with first capacitor C 1 series connection back, the 6th end of time base circuit IC1 all is connected second resistance R 2 with the 7th end, and the 4th end of time base circuit IC1 all is connected potentiometer Rp with the 8th end; The 3rd end of time base circuit IC1 is connected with audio ic IC2 through a diode VD, and is connected to power cathode through second capacitor C 2; The output port of audio ic IC2 connects the 2nd end of audio-frequency power amplifier IC3 through the 3rd capacitor C 3, the 4th end and the 5th end of audio-frequency power amplifier IC3 all are connected to power cathode, the 1st end of audio-frequency power amplifier IC3 connects the 3rd end of audio-frequency power amplifier IC3 through the 4th capacitor C 4, and the 3rd end of audio-frequency power amplifier IC3 is connected to power cathode through the 5th capacitor C 5, in addition through the 6th capacitor C 6 with after loudspeaker B is connected, link to each other with the negative pole of power supply again.The positive pole of power supply is connected back ground connection through switch S with the 7th capacitor C 7.
Thermistor RT is a kind of negative tempperature coefficient thermistor, and resistance reduces gradually with the rising of temperature.The model of audio ic IC2 is KD9561, can produce 4 kinds of simulated sound, i.e. police car sound, fire engine sound, ambulance sound and machine gun sound.Audio-frequency power amplifier IC3 can amplify faint sound signal, promotes loudspeaker B sounding.
Principle of work of the present utility model is: when temperature does not reach predetermined value, because the resistance of thermistor RT is greater than 1/2(Rp+R1), trigger end the 2nd terminal potential of time base circuit IC1 is higher than 1/3G(2V), make that the 3rd end of time base circuit IC1 is an electronegative potential, diode VD ends, audio ic IC2 is because of can not get the output of supply voltage absence of audio signal, and loudspeaker B is noiseless.When temperature is elevated to predetermined value, the resistance of thermistor RT will be less than 1/2(Rp+R1), trigger end the 2nd terminal potential of time base circuit IC1 is lower than 1/3G(2V), output terminal 3 ends of time base circuit IC1 are that electronegative potential jumps to high level, about 5V(200mA is exported in diode VD conducting) DC voltage.This DC voltage is supplied with audio ic IC2 after 2 filtering of second capacitor C.The siren signal output of audio ic IC2 generation at this moment, input end the 3rd end that is coupled to audio-frequency power amplifier IC3 through the 3rd capacitor C 3 carries out power amplification.Sound signal after the amplification is sent loud siren chimes of doom after the 6th capacitor C 6 drives loudspeaker B from the five terminal output of audio-frequency power amplifier IC3.
Claims (1)
1. a temperature alarm is characterized in that: comprise time base circuit (IC1), audio ic (IC2) and audio-frequency power amplifier (IC3); Potentiometer (Rp) is connected the 2nd end of time base circuit (IC1) with first resistance (R1) series connection back, the 2nd end of time base circuit (IC1) and the 1st end that connects after thermistor (RT) is connected to time base circuit (IC1), and be connected the 5th end of time base circuit (IC1) with first electric capacity (C1) series connection back, the 6th end of time base circuit (IC1) all is connected second resistance (R2) with the 7th end, and the 4th end of time base circuit (IC1) all is connected potentiometer (Rp) with the 8th end; The 3rd end of time base circuit (IC1) is connected with audio ic (IC2) through a diode (VD), and is connected to power cathode through second electric capacity (C2); The output port of audio ic (IC2) connects the 2nd end of audio-frequency power amplifier (IC3) through the 3rd electric capacity (C3), the 4th end and the 5th end of audio-frequency power amplifier (IC3) all are connected to power cathode, the 1st end of audio-frequency power amplifier (IC3) connects the 3rd end of audio-frequency power amplifier (IC3) through the 4th electric capacity (C4), and the 3rd end of audio-frequency power amplifier (IC3) is connected to power cathode through the 5th electric capacity (C5), in addition through the 6th electric capacity (C6) with after loudspeaker (B) is connected, link to each other with the negative pole of power supply again.The positive pole of power supply is connected back ground connection through switch (S) with the 7th electric capacity (C7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206628416U CN201926509U (en) | 2010-12-16 | 2010-12-16 | Temperature alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206628416U CN201926509U (en) | 2010-12-16 | 2010-12-16 | Temperature alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201926509U true CN201926509U (en) | 2011-08-10 |
Family
ID=44430354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206628416U Expired - Fee Related CN201926509U (en) | 2010-12-16 | 2010-12-16 | Temperature alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201926509U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344911A (en) * | 2014-11-10 | 2015-02-11 | 成都美益达医疗科技有限公司 | Temperature signal detection circuit for centrifugal machine |
-
2010
- 2010-12-16 CN CN2010206628416U patent/CN201926509U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344911A (en) * | 2014-11-10 | 2015-02-11 | 成都美益达医疗科技有限公司 | Temperature signal detection circuit for centrifugal machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20111216 |