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Heat sensitive resistance, photosensitive, force sensitive, humidity sensitive resistance, magnetism sensitive resistance variability feature demonstrator

A technology of photosensitive resistors and force sensitive resistors, which is applied in the field of resistance variable characteristic demonstration instruments, can solve the problems that students cannot intuitively understand the variable characteristics, and there is no demonstration instrument demonstration, etc., to achieve strong intuitiveness, low cost, and high cost Effect

Inactive Publication Date: 2008-09-10
NANJING COLLEGE OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the teaching of electronic circuits, when teaching the variable characteristics of thermistors, photoresistors, force-sensitive resistors, humidity-sensitive resistors, and magneto-sensitive resistors, there is no demonstration instrument demonstration, and students cannot intuitively understand their variable characteristics

Method used

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  • Heat sensitive resistance, photosensitive, force sensitive, humidity sensitive resistance, magnetism sensitive resistance variability feature demonstrator
  • Heat sensitive resistance, photosensitive, force sensitive, humidity sensitive resistance, magnetism sensitive resistance variability feature demonstrator

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Embodiment Construction

[0010] exist figure 1 Among them, pin 4 and pin 8 of the 555 integrated circuit (I) are connected to the positive pole of the DC power supply, pin 1 of the 555 integrated circuit (I) is connected to the negative pole of the DC power supply, and pin 5 of the 555 integrated circuit (I) passes through the capacitor (C 2 ) connected to the negative pole of the DC power supply, the 3 pins of the 555 integrated circuit (I) and the positive pole of the DC power supply are connected to the light-emitting diode (G), and the 2 pins of the 555 integrated circuit (I) are connected to the 6 pins and passed through the capacitor (C 1 ) is connected to the negative pole of the DC power supply, the switch (K) is connected in series with the power supply (E), and the thermistor (R 1 ), photoresistor (R 2 ), force sensitive resistor (R 3 ), Humidistor (R 4 ), magnetoresistor (R 5 ) and the ohmmeter (V) in parallel, one end is connected to the positive pole of the DC power supply, and the ot...

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Abstract

The invention relates to a variable resistance characteristic demonstrator, in particular to variable characteristic demonstrators of a thermal resistance, a photoresistor, a piezoresistor, a hygristor and a magneto resistor. The circuit comprises an Ohmmeter, a change-over switch, the thermal resistance, the photoresistor, the piezoresistor, the hygristor, the magneto resistor, a 555 integrated circuit, a resistor, a capacitor and a light emitting diode; the variable resistance characteristic demonstrator is characterized in that one end of the thermal resistance, the photoresistor, the piezoresistor, the hygristor, the the magneto resistor and the Ohmmeter is connected with the positive electrode of a DC power supply after parallel connection, while the other end thereof is connected with a pin 2 and a pin 6 of the 555 integrated circuit through the change-over switch and the resistance, one end of the variable resistance is connected with the change-over switch, while the other end thereof is connected with the negative electrode of the DC power supply. By adopting the technical proposal, the variable resistance characteristic demonstrator has the advantages and active effects that the variable characteristics of the thermal resistance, the photoresistor, the piezoresistor, the hygristor and the magneto resistor can be demonstrated through the reading changes of the Ohmmeter and the working state of the light emitting diode with high visualization and low cost.

Description

Technical field [0001] The invention relates to a variable characteristic demonstration instrument of resistance, in particular to a variable characteristic demonstration instrument of a thermistor, a photosensitive resistor, a force sensitive resistor, a humidity sensitive resistor and a magnetic sensitive resistor. Background technique [0002] At present, in the teaching of electronic circuits, when teaching the variable characteristics of thermistors, photoresistors, force-sensitive resistors, humidity-sensitive resistors, and magnetoresistors, there is no demonstration instrument demonstration, and students cannot intuitively understand their variable characteristics. Contents of the invention [0003] The object of the present invention is to provide a kind of thermistor, photosensitive resistor, force sensitive resistor, humidity sensitive resistor, magnetoresistor variable characteristic demonstrator, can demonstrate thermistor, Variable characteristics of photores...

Claims

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Application Information

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IPC IPC(8): G09B23/18
Inventor 葛宇宏郝杰
Owner NANJING COLLEGE OF CHEM TECH
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