Abstract
After nearly a year of probation, the type of AM radio repeater circuit in general can be retrieved in a number of local radio stations; the installation is convenient, the output has a loud voice, and bass is rich, which make it indeed a good choice for beginners’ homemade radio circuit. Beginners can give radio principle about double harvest theory and practice. The whole circuit fabrication costs low. The AM circuit is successful, plus USB, TF playing blocks, FM module circuit without external antenna, and the antenna is surrounded by a large box inside a circle around the wire. The two buttons use to control move, and changing frequencies is very convenient. We usually put the electromagnetic spider web test on the radio and put it all over the country.
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