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该机为AM接收、FM及FM立体声汽车收放机。其电原理图见本刊1997年10期中心插页。FM及FM立体声电路由TU101、Q101、CF102、IC101、IC102等组成。其中,Q101为FM预中放管,以弥补CF102滤波器的插入损耗。IC101为FM中放电路。IC102为立体声解码电路。AM收音电路由Q201、Q202、Q203及D201等分立电路组成。其中,Q201为高放管,Q202为变频管,Q203为中放管,D201为检波二极管。放音电路以IC301为主构成。IC302为收、放音功率放大电路。 1.FM信号流程 由FM高放电路接收来的FM信号经调频头TU101内电路进行放大和混频后输出10.7MHz中频信号,从组件的IF端输出,经R101、C121加至FM预中放管Q101的基极,经Q101放大后从集电极输出,再
The aircraft for the AM receiver, FM and FM stereo car receiver. The electrical schematic see the journal 1997 10 Center insert. FM and FM stereo circuit consists of TU101, Q101, CF102, IC101, IC102 and other components. Among them, Q101 FM pre-release tube to compensate for CF102 filter insertion loss. IC101 for the FM discharge circuit. IC102 is a stereo decoding circuit. AM radio circuit consists of Q201, Q202, Q203 and D201 and other discrete circuits. Among them, Q201 is high to put the tube, Q202 is the frequency conversion tube, Q203 is put in the tube, D201 is the detection diode. Playback circuit to IC301-based composition. IC302 for close, playback power amplifier. 1. FM signal process FM high discharge circuit to the FM signal received by the tuner TU101 internal circuit to amplify and mix the output 10.7MHz IF signal from the module’s IF output by R101, C121 FM pre-release The base of Q101 tube, amplified by the Q101 from the collector output, and then