CN102339543A - Demonstration instrument for thermistor characteristics - Google Patents
Demonstration instrument for thermistor characteristics Download PDFInfo
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- CN102339543A CN102339543A CN2010102345164A CN201010234516A CN102339543A CN 102339543 A CN102339543 A CN 102339543A CN 2010102345164 A CN2010102345164 A CN 2010102345164A CN 201010234516 A CN201010234516 A CN 201010234516A CN 102339543 A CN102339543 A CN 102339543A
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- pin
- integrated circuit
- thermistor
- ohmmeter
- resistance
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Abstract
The invention relates to a demonstration instrument for thermistor characteristics, and belongs to the technical field of demonstration instruments. The circuit of the demonstration instrument consists of resistors, a positive temperature coefficient (PTC) thermistor, a negative temperature coefficient (NTC) thermistor, a critical temperature coefficient (CTC) thermistor, an electric heating wire, a transfer switch, an ohmmeter, a 555 integrated circuit, capacitors, a light emitting diode (LED), a rectifying circuit and a transformer. The demonstration instrument is characterized in that the variable resistor is connected with the transfer switch and is connected with the ohmmeter in series; the PTC thermistor, the NTC thermistor and the CTC thermistor are connected in parallel, the connection ends of the thermistors are connected with a pin 1 of the 555 integrated circuit, and the other ends of the thermistors are respectively connected with the transfer switch; and one end of the ohmmeter is connected with a pin 2 of the 555 integrated circuit, and the other end of the ohmmeter is connected with the pin 1 of the 555 integrated circuit. By adopting the technical scheme, the demonstration instrument has the advantages and positive effects of strong intuitive property, economical efficiency and practicability.
Description
Technical field
The present invention relates to a kind of thermistor characteristic demonstrating instrument, belong 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 matters to be solved by this invention 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 solution adopted for the present invention to solve the technical problems is: 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, 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 through second electric capacity; 6 pin of 555 integrated circuit, 7 pin link to each other through the positive pole of first resistance and direct supply, are connected on direct supply two ends after first resistance and first capacitances in series, and second resistance links to each other with end after light emitting diode is connected and 3 pin of 555 integrated circuit; 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, and 220 volts of alternating current input ends link to each other with primary through power switch, heating wire with link to each other with primary again after the heating wire switch is connected; 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; End after posistor, 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, and an 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 present invention had are: intuitive is strong, and is economic and practical.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the structural representation of the embodiment of the invention.
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 through 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 through 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) link to each other with a end and 3 pin of 555 integrated circuit (I) after light emitting diode (G) series connection, 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 through 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 and 1 pin of 555 integrated circuit (I) after the parallel connection 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 (2)
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 through 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 through 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) link to each other with a end and 3 pin of 555 integrated circuit (I) after light emitting diode (G) series connection, 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 through 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 and 1 pin of 555 integrated circuit (I) after the parallel connection 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).
2. a kind of thermistor characteristic demonstrating instrument according to claim 1 is characterized in that: 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102345164A CN102339543A (en) | 2010-07-23 | 2010-07-23 | Demonstration instrument for thermistor characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102345164A CN102339543A (en) | 2010-07-23 | 2010-07-23 | Demonstration instrument for thermistor characteristics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102339543A true CN102339543A (en) | 2012-02-01 |
Family
ID=45515248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102345164A Pending CN102339543A (en) | 2010-07-23 | 2010-07-23 | Demonstration instrument for thermistor characteristics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102339543A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664888A (en) * | 2020-05-15 | 2020-09-15 | 杭州杰牌传动科技有限公司 | Distributed speed reduction motor energy monitoring system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261777A (en) * | 2008-04-18 | 2008-09-10 | 南京化工职业技术学院 | Heat sensitive resistance, photosensitive, force sensitive, humidity sensitive resistance, magnetism sensitive resistance variability feature demonstrator |
| CN201820382U (en) * | 2010-07-23 | 2011-05-04 | 南京化工职业技术学院 | Thermistor characteristic demonstration instrument |
-
2010
- 2010-07-23 CN CN2010102345164A patent/CN102339543A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261777A (en) * | 2008-04-18 | 2008-09-10 | 南京化工职业技术学院 | Heat sensitive resistance, photosensitive, force sensitive, humidity sensitive resistance, magnetism sensitive resistance variability feature demonstrator |
| CN201820382U (en) * | 2010-07-23 | 2011-05-04 | 南京化工职业技术学院 | Thermistor characteristic demonstration instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664888A (en) * | 2020-05-15 | 2020-09-15 | 杭州杰牌传动科技有限公司 | Distributed speed reduction motor energy monitoring system and method |
| CN111664888B (en) * | 2020-05-15 | 2022-08-02 | 杭州杰牌传动科技有限公司 | Distributed speed reduction motor energy monitoring system and method |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120201 |