Variable frequency square-wave generator

Abstract

The invention relates to a variable frequency square-wave generator, belonging to the field of instruments, and comprising a singlechip, a digital potentiometer, a square wave generating circuit, a display circuit and a keyboard circuit. The variable frequency square-wave generator is characterized in that the square wave generating circuit generates a square wave, the frequency of the square wave is adjusted by the resistance output by the digital potentiometer, and the resistance output by the digital potentiometer is controlled by the singlechip; the output of the square wave generating circuit is connected with the singlehcip to form closed loop feedback control, and the singlechip controls the output value of the digital potentiometer through a feedback signal to ensure that the frequency of the square wave is stable; and the display circuit and the keyboard circuit are connected with the signechip to display the frequency value of the square wave and set the frequency value of the square wave. In the invention, the digital potentiometer is utilized to replace a common manual regulating potentiometer for changing the frequency of the square wave, therefore, the resistance of the digital potentiometer can be controlled through the singlechip, and the function of automatically changing the frequency of the square wave is realized.

Description

technical field [0001] A variable frequency square wave generator belongs to the field of instruments and meters and can be used in various instruments and meters and control units. Background technique [0002] The current instruments and meters or some control units often use a single-chip microcomputer as the control core. It is possible to use the single-chip microcomputer itself to generate variable frequency square waves, but it is easy to bring unnecessary workload to the single-chip microcomputer itself. This is currently using a single-chip microcomputer as the control The core problem is that it needs to generate a variable frequency square wave; the electronic technology experimental training equipment of the university's electrical and electronic students and the single-chip microcomputer experimental training equipment are independent of each other, the experimental training resources are not organically combined, and the utilization rate of experimental resource...

AI Technical Summary

Problems solved by technology

[0002] The current instruments and meters or some control units often use a single-chip microcomputer as the control core. It is possible to use the single-chip microcomputer itself to generate variable frequency square waves, but it is easy to bring unnecessary workload to the single-chip microcomputer itself. This is currently using a single-chip microcomputer as the control The core problem is that it needs to generate a variable frequency square wave; the electronic technology experimental training equipment of the university's electrical and electronic students and the single-chip microcomputer experimental training equipment are independent of each other, the experimental training resources are not organically combined, and the utilization rate of experimental resources is low. A waste of resources, the knowledge learned by students is not effectively, continuously and comprehensively consolidated and applied

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