Teaching demonstrator capable of measuring positive and negative conductivities

A conductivity and demonstrator technology, applied in the field of teaching instrument demonstration, can solve the problems of inability to popularize teaching instruments, insufficient and high cost

Inactive Publication Date: 2017-05-24
CHONGQING ZUNLAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the various experimental instruments in teaching are constantly improving, but there are still many shortcomings: First, the types of experimental instruments are insufficient, especially the experimental instruments for low-grade students are ...

Method used

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  • Teaching demonstrator capable of measuring positive and negative conductivities
  • Teaching demonstrator capable of measuring positive and negative conductivities
  • Teaching demonstrator capable of measuring positive and negative conductivities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0085] figure 1 , 2 , 3 together describe a way of specific implementation.

[0086] 1. Options: The two gates in the oscillation stage and the inverter in the cursor start unit all use integrated circuit CD4069. The two-stage amplifier in the amplification stage, the positive electricity identification arithmetic unit, and the negative electricity identification integrated circuit are all welded by the operational amplifier LM324. The oscillating capacitor uses a capacitor with a small leakage coefficient. The emitter follower selects NPN triode. The common cathode light-emitting tube adopts a common-cathode two-color light-emitting tube.

[0087] 2. Welding: the connection of each part is as follows: figure 1 connection, the specific electronic components of each part except the display part are connected as figure 2 Soldering, display levels such as image 3 Welded as shown.

[0088] Three, debugging.

[0089] First determine a demonstration resistor, and the res...

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PUM

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Abstract

A teaching demonstrator capable of measuring positive and negative conductivities belongs to the field of demonstration of teaching apparatuses. The demonstrator is composed of a switching stage, a negative electricity identification stage, a negative electricity amplifying stage, a negative electricity display amplifying stage, a negative electricity cursor and voice indication stage, a positive electricity identification stage, a positive electricity amplifying stage, a positive electricity display amplifying stage, a positive electricity cursor and voice indication stage, an oscillation stage and a display stage; the switching stage comprises a changeover switch, a test rod interface and a testboard; when a measured object is connected to the switching stage, the negative electricity identification stage and the positive electricity identification stage identify positive and negative charges, after amplification, the cursor and voice indication stages are started according to the weakness of the charges, the display amplifying stages start the corresponding display stages, and the magnitude of energy is reflected accurately via the display stages and the cursor and voice indication stages. A multi-display effect is realized, teenagers can known the conductivity condition and understand concepts and meanings of conductors, resistors and insulators, and the demonstrator can be popularized widely in schools.

Description

technical field [0001] The utility model belongs to the field of teaching instrument demonstration. Background technique [0002] Innovation is the soul of a nation, and young students are the power of innovation. [0003] The strength of a country lies in its talents, and the cultivation of talents lies in education. The focus of education on young people is that the country is strong when young people are strong, and the country progresses when young people progress. To cultivate young people's love for science, improving the quality of teaching is the key, and the accuracy of experimental instruments is an important factor in improving teaching. The experiments are more convincing, so that students can understand things, understand natural phenomena, inspire students' thinking, and play an important role in improving the level of education. Therefore, various experimental instruments in teaching are constantly improving, but there are still many deficiencies: First, the...

Claims

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Application Information

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IPC IPC(8): G09B23/18
CPCG09B23/182
Inventor 蒋丹杨远敏
Owner CHONGQING ZUNLAI TECH
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