Debugging instrument of superheterodyne medium wave band amplitude-modulation receiver

Abstract

The invention provides a debugging instrument of a superheterodyne medium wave band amplitude-modulation receiver and belongs to the field of electrical and electronic whole machine debugging devices. The debugging instrument of the superheterodyne medium wave band amplitude-modulation receiver comprises a field programmable gata array FPGA control system, a digital-to-analog converter DAC module, an integrated voltage stabilizing module, a power supply module and a ampere meter. The FPGA control system is mainly formed by a master control part, an input switch, a pull-up resistor, an indicating component and a current-limiting resistor. The DAC module is mainly formed by a DAC 908 and an operational amplifier OPA 690. The integrated voltage stabilizing module is mainly formed by an LM317T voltage stabilizing power supply module, a 10 uF input capacitor and a 100 uF output capacitor. The power supply module is mainly formed by JMD20-55T switching power supply, a power supply switch and a direct current power supply load end. The current meter is mainly formed by a ZF5135 digital current meter and a +5V direct current power supply. The debugging instrument of the superheterodyne medium wave band amplitude-modulation receiver can greatly reduce debugging cost, saves teaching funds, and enables cost of an original debugging device to be reduced from 5000-8000 yuan RMB to 800 yuan RMB.

Description

technical field [0001] The invention belongs to the field of electrical and electronic complete machine debugging devices, in particular to a debugging instrument suitable for debugging various performance parameters of a superheterodyne mid-band AM radio. Background technique [0002] Electrical and electronic training is a necessary electrical practice course in science and engineering colleges. Assembling a small radio is one of the most basic teaching contents. The superheterodyne mid-band AM radio composed of transistors is widely used because of its typical circuit structure, general assembly process, and simple debugging method. [0003] In order to make the performance parameters of the assembled superheterodyne medium-band AM radio meet the requirements of the original design and have good working performance, the whole machine must be adjusted after the whole machine is assembled. [0004] Debugging a superheterodyne mid-band AM radio usually requires the use of a...

AI Technical Summary

Problems solved by technology

[0021] 2. The low-frequency signal output line is confused with the high-frequency signal output line

[0022] 3. The accuracy of frequency adjustment is poor

[0023] To sum up, the traditional combination of superheterodyne mid-band AM radio debugging equipment is not only bulky and costly, but also requires repeated adjustment of signal frequency during the debugging process, which is difficult to achieve accurately, seriously affecting the teaching effect

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