The Design Of An Extremely Low Frequency Electromagnetic Field Generator For Nerve Cell Experiment

Nowadays, the relation between magnetic filed and health has come to our attention. Many institutes are interested in this topic. And the most impressed filed of this problem is the relationship between magnetic filed and cancers. It was confirmed that the magnetic filed sometimes may cause cancer but on the other hand a certain magnetic filed can restore health.Scientific researches need instrument. In this paper, the design of a magnetic filed producer is introduced.This thesis begins with an introduction about the magnetic research field. According to that, the indicatrix of the design is decided. Then the system architecture of this structure is presented, introducing the software and hardware.The design mainly includes the power supply module,the Human Interface module,control module,the signal generator module and the power amplify module. A transformer is used in the power supply module. 4×4 keyboard and LCD constitute the Human Interface module.Winbond77E58 is the important part of the control module. It is a fast 8051 compatible microcontroller, the most significant feature of which is the high speed architecture of 4 clocks/machine cycle runs up to 40 MHz while the standard 8051 MCU is slow speed architecture of 12 clocks cycle. Different methods of wave producer are compared. Then, the analysis of the results gives the reason of some defects and one method is chosen. A power amplify module is concerned with. At the end , how to make this instrument better is discussed.