CN201820382U - Thermistor characteristic demonstration instrument - Google Patents
Thermistor characteristic demonstration instrument Download PDFInfo
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- CN201820382U CN201820382U CN2010202683999U CN201020268399U CN201820382U CN 201820382 U CN201820382 U CN 201820382U CN 2010202683999 U CN2010202683999 U CN 2010202683999U CN 201020268399 U CN201020268399 U CN 201020268399U CN 201820382 U CN201820382 U CN 201820382U
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Abstract
The utility model relates to a thermistor characteristic demonstration instrument belonging to the technical field of demonstration instruments. A circuit consists of a resistor, a positive temperature coefficient thermistor, a negative temperature coefficient thermistor, a critical temperature coefficient thermistor, an electric heating wire, a change-over switch, an ohmmeter, a 555 integrated circuit, a capacitor, a light-emitting diode, a rectifying circuit and a transformer. The thermistor characteristic demonstration instrument is characterized in that a changeable resistor is connected with the change-over switch and connected in series with the ohmmeter; after the positive temperature coefficient thermistor, the negative temperature coefficient thermistor and the critical temperature coefficient thermistor are connected in parallel, one end of the parallel connection is connected with a pin 1 of the 555 integrated circuit, while the other ends of the three thermistors are respectively connected with the change-over switch; and one end of the ohmmeter is connected with a pin 2 of the 555 integrated circuit, while the other end is connected with a pin 1 of the 555 integrated circuit. Due to the adoption of the technical scheme, the thermistor characteristic demonstration instrument has the advantages of strong visual property as well as economy and practicability.
Description
Technical field
The utility model relates to a kind of thermistor characteristic demonstrating instrument, belongs to teaching demonstration instrument technical field.
Background technology
At present, in the teaching of electronic circuit, when lecturing in the circuit component the temperature variant characteristic of serial thermistor (posistor, negative tempperature coefficient thermistor, critical stability resistance) resistance, no demonstration instrument is demonstrated.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of thermistor characteristic demonstrating instrument, can demonstrate the characteristic of the resistance of posistor, negative tempperature coefficient thermistor, critical stability resistance with variation of ambient temperature.
The technical scheme that its technical matters that solves the utility model adopts is: circuit is by resistance, posistor, negative tempperature coefficient thermistor, critical stability resistance, heating wire, switch, ohmmeter, 555 integrated circuit, electric capacity, light emitting diode, rectification circuit, transformer is formed, 4 pin of 555 integrated circuit, the positive pole of 8 pin and direct supply links to each other, 1 pin of 555 integrated circuit and the negative pole of direct supply link to each other, 5 pin of 555 integrated circuit link to each other with dc power cathode by second electric capacity, 6 pin of 555 integrated circuit, 7 pin link to each other by the positive pole of first resistance and direct supply, be connected on direct supply two ends after first resistance and first capacitances in series, end after the series connection of second resistance and light emitting diode and 3 pin of 555 integrated circuit link to each other, the negative pole of the other end and direct supply links to each other, the 3rd electric capacity is connected on direct supply two ends, 220 volts of alternating current input ends link to each other with primary by power switch, link to each other with primary again after the series connection of heating wire and heating wire switch, transformer secondary output links to each other with rectification circuit input end, rectification circuit output end provides direct supply to late-class circuit, it is characterized in that: variable resistor links to each other with switch, variable resistor and ohmmeter series connection, posistor, end after negative tempperature coefficient thermistor and the parallel connection of critical stability resistance and 1 pin of 555 integrated circuit link to each other, the other end links to each other with switch respectively, one end of ohmmeter links to each other with 2 pin of 555 integrated circuit, and 1 pin of the other end and 555 integrated circuit links to each other.Graphic Panel links to each other with base, be fixed with switch, variable resistor, heating wire switch and power switch in base front surface, the Graphic Panel front is fixed with glass box, at the glass box internal fixation thermometer, posistor, negative tempperature coefficient thermistor and critical stability resistance are arranged, the Graphic Panel front is equipped with ohmmeter and light emitting diode, and other circuit original paper welds in the circuit board and places in the base.
Because adopt technique scheme, advantage and good effect that the utility model had are: intuitive is strong, and is economic and practical.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the structural representation of the utility model embodiment.
R among the figure
1. variable resistor R
2. first resistance R
3. posistor R
4. negative tempperature coefficient thermistor R
5. the critical stability resistance R
6. second resistance R
7. heating wire B. switch Ω. ohmmeter is integrated circuit C I.555
1. first capacitor C
2. second capacitor C
3. the 3rd electric capacity G. light emitting diode M. rectification circuit T. transformer K
1. the heating wire K switch
2. V.220 power switch lies prostrate alternating current input end A. Graphic Panel E. thermometer F. glass box D. base
Embodiment
In Fig. 1, the positive pole of 4 pin of 555 integrated circuit (I), 8 pin and direct supply links to each other, and 1 pin of 555 integrated circuit (I) links to each other with dc power cathode, and 5 pin of 555 integrated circuit (I) are by the second electric capacity (C
2) link to each other with the negative pole of direct supply, 6 pin of 555 integrated circuit (I), 7 pin are by the first resistance (R
2) link to each other the first resistance (R with the positive pole of direct supply
2) and the first electric capacity (C
1) be connected on direct supply two ends, the second resistance (R after the series connection
6) with light emitting diode (G) series connection after an end and 3 pin of 555 integrated circuit (I) link to each other, the negative pole of the other end and direct supply links to each other, the 3rd electric capacity (C
3) being connected on direct supply two ends, 220 volts of alternating current input ends (V) are by power switch (K
2) with elementary linking to each other of transformer (T), heating wire (R
7) and heating wire switch (K
1) after the series connection again with elementary linking to each other of transformer (T), transformer (T) is secondary to link to each other with rectification circuit (M) input end, rectification circuit (M) output terminal provides direct supply to late-class circuit, variable resistor (R
1) link to each other variable resistor (R with switch (B)
1) and ohmmeter (Ω) series connection, posistor (R
3), negative tempperature coefficient thermistor (R
4) and critical stability resistance (R
5) a end after the parallel connection and 1 pin of 555 integrated circuit (I) link to each other, the other end links to each other with switch (B) respectively, and an end of ohmmeter (Ω) links to each other with 2 pin of 555 integrated circuit (I), and the other end links to each other with 1 pin of 555 integrated circuit (I).
In Fig. 2, Graphic Panel (A) links to each other with base (D), is fixed with switch (B), variable resistor (R in base (D) front
1), heating wire switch (K
1) and power switch (K
2), Graphic Panel (A) front is fixed with glass box (F), at glass box (F) internal fixation thermometer (E), posistor (R is arranged
3), negative tempperature coefficient thermistor (R
4) and critical stability resistance (R
5), Graphic Panel (A) front is equipped with ohmmeter (Ω) and light emitting diode (G), and other circuit original paper welds in the circuit board and places in the base (D).
Claims (1)
1. thermistor characteristic demonstrating instrument, circuit is made up of resistance, posistor, negative tempperature coefficient thermistor, critical stability resistance, heating wire, switch, ohmmeter, 555 integrated circuit, electric capacity, light emitting diode, rectification circuit, transformer, the positive pole of 4 pin of 555 integrated circuit (I), 8 pin and direct supply links to each other, 1 pin of 555 integrated circuit (I) links to each other with dc power cathode, and 5 pin of 555 integrated circuit (I) are by the second electric capacity (C
2) link to each other with the negative pole of direct supply, 6 pin of 555 integrated circuit (I), 7 pin are by the first resistance (R
2) link to each other the first resistance (R with the positive pole of direct supply
2) and the first electric capacity (C
1) be connected on direct supply two ends, the second resistance (R after the series connection
6) with light emitting diode (G) series connection after an end and 3 pin of 555 integrated circuit (I) link to each other, the other end links to each other with dc power cathode, the 3rd electric capacity (C
3) being connected on direct supply two ends, 220 volts of alternating current input ends (V) are by power switch (K
2) with elementary linking to each other of transformer (T), heating wire (R
7) and heating wire switch (K
1) after the series connection again with elementary linking to each other of transformer (T), transformer (T) is secondary to link to each other with rectification circuit (M) input end, rectification circuit (M) output terminal provides direct supply to late-class circuit, it is characterized in that: variable resistor (R
1) link to each other variable resistor (R with switch (B)
1) and ohmmeter (Ω) series connection, posistor (R
3), negative tempperature coefficient thermistor (R
4) and critical temperature be quick resistance (R
5) a end after the parallel connection and 1 pin of 555 integrated circuit (I) link to each other, the other end closes (B) with turn-off respectively and links to each other, and an end of ohmmeter (Ω) links to each other with 2 pin of 555 integrated circuit (I), and the other end links to each other with 1 pin of 555 integrated circuit (I).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202683999U CN201820382U (en) | 2010-07-23 | 2010-07-23 | Thermistor characteristic demonstration instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202683999U CN201820382U (en) | 2010-07-23 | 2010-07-23 | Thermistor characteristic demonstration instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201820382U true CN201820382U (en) | 2011-05-04 |
Family
ID=43918329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202683999U Expired - Fee Related CN201820382U (en) | 2010-07-23 | 2010-07-23 | Thermistor characteristic demonstration instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201820382U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102254473A (en) * | 2011-06-14 | 2011-11-23 | 盐城师范学院 | Demonstrator for characteristics of automatic control circuit of sound sensitive sensors |
| CN102339543A (en) * | 2010-07-23 | 2012-02-01 | 南京化工职业技术学院 | Demonstration instrument for thermistor characteristics |
| CN102881210A (en) * | 2012-10-30 | 2013-01-16 | 南京化工职业技术学院 | Humidity sensing characteristic demonstrator for humidity sensor |
| CN103093674A (en) * | 2012-12-26 | 2013-05-08 | 盐城师范学院 | Heat-sensitive cable characteristic demonstration instrument |
| CN104376768A (en) * | 2014-11-13 | 2015-02-25 | 盐城工业职业技术学院 | Thermistor feature and application experimental instrument |
| CN104536491A (en) * | 2014-12-19 | 2015-04-22 | 湖南水口山有色金属集团有限公司 | Temperature control circuit |
-
2010
- 2010-07-23 CN CN2010202683999U patent/CN201820382U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339543A (en) * | 2010-07-23 | 2012-02-01 | 南京化工职业技术学院 | Demonstration instrument for thermistor characteristics |
| CN102254473A (en) * | 2011-06-14 | 2011-11-23 | 盐城师范学院 | Demonstrator for characteristics of automatic control circuit of sound sensitive sensors |
| CN102881210A (en) * | 2012-10-30 | 2013-01-16 | 南京化工职业技术学院 | Humidity sensing characteristic demonstrator for humidity sensor |
| CN103093674A (en) * | 2012-12-26 | 2013-05-08 | 盐城师范学院 | Heat-sensitive cable characteristic demonstration instrument |
| CN104376768A (en) * | 2014-11-13 | 2015-02-25 | 盐城工业职业技术学院 | Thermistor feature and application experimental instrument |
| CN104536491A (en) * | 2014-12-19 | 2015-04-22 | 湖南水口山有色金属集团有限公司 | Temperature control circuit |
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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: 20110504 Termination date: 20130723 |