ABSTRACT
Along with the development of electronic technology, radio receivers with high qualification, low energy consumption, multi-purpose, small size have come true. However, the essence of the radio in fact didn't change.
This thesis discussed the superheterodyne principle of AM radio circuit, which consists of input circuits, frequency synthesis level, IF amplifier, detector circuit, low frequency amplifier and power amplifier parts, each part has a number of transistors, whose acceptance frequency range of 535KHz ~ 1605KHz in the band. After final assembly and commissioning, come local program can be received very clear, for example, Zhejiang People's Radio AM810, which shows the design task has been basically completed.
Keywords: Transistor; Frequency synthesis; Mixer; IF amplifier; Radio