| Physics is natural science, based on experiment. Experiment not only enable the student to comprehend and consolidate the physics knowledge in the physics teaching, but also cultivate the experiment ability of the student, fashion the thought method of science, predominate the research method of science.With the rapid development of science and technology, all kinds of new and developing electronic devices are constantly springing up, which are changing people' s life and production in every aspect. They are especially pounding at the traditional experiment in this respect . It is one of the most necessary problems that should be solved urgently in physical education to adopt the modern electronics technique to reform physic experiment 1 the research and application of luminous dial-type electronic current meter Luminous dial-type electronic current meter is mostly made of the short-circuit electric current amplifier and voltage comparator, LED display the magnitude of voltage that voltage comparator export by comparing the output of the short-circuit electric current amplifier . It can overcome the shortcoming of large internal resistance, large critical resistance and slow response of pointer-type meter, display the relative magnitude and direction of current sensitively and apparently , measure ripple current and low frequent alternating current. The good result is obtained when the luminous dial-type electronic current meter can be apply to demonstrate experiment on LC electromagnetic oscillation and single-circle cutting magnetic induction lines etc2 the research and application of small range electric current with infinitesimal internal resistanceElectronic current meter is one of measure meter that can be used in common in physics experiment, electronics creation, electrician measure. The currentmeter that is made of short-circuit electric current and not only keep the finger current meter 's advantage of stable and convenient reading and convenient observation but also overcome the shortcoming of large internal resistance and low accuracy. Particularly overcome the influence of electronic current meter ' s when it is connected tandem in the circuitry in order to measure small electric current.3 the research and application of laser modulation and laser communication demonstrated apparatusAt present, the laser modulation and laser communication demonstrated apparatus is saled at a price, money of more than ten yuan are spended making manufacturing laser-demodulated demonstrated apparatus that satisfy teaching. The equipment directly modulate the intensity of consecutive light that laser-LED emit with signal that music integrated circuit export, the voice is reverted with reproducer by enlarging of audio amplifier. Because the integrated circuit and few electronic devices are used and debugging is convenient, the device easily is produced success fully.4 the research and application of simple transmitterThe voice wave is converted electronic signal with transmitter, it offer mutative signal of voice wave for oscillograph, students apprehend voice wave profoundly by observing shape of voice wave with oscillograph, then students can take an interest in it. The simple transmitter I made with LM386 is cheap, can be used conveniently, It inspires students' interest of study science and increased the student's creative consciousness. The good result is obtained when it is used in acoustic experiment.5 adjustable continuously DC voltage regulator with arithmetic figure showAt present, common low voltage student, power supply and student power supply in common teaching apparatus have large internal resistance, have low adjusting rate when it is loaded. The adjustable continuously DC voltage regulator with show of figure I made consist of the integrated circuit LM317with the ICL7107CPL primarily. It have perfect ability of protection when it is over loaded .The voltage can be adjusted continuously, it is used conveniently, the price is cheap.6 current limited 6v chargerIn... |
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