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当前,用日本索尼公司“CXA”系列集成块组装的AM/FM袖珍收音机的社会拥有量很大。用耳机收听调频节目时,感觉中高音尚可,但低音效果很差。为展宽其高低端频响,改善听音效果,本人试对其电路作一些小改动,收到良好效果。方法如下: 1.改善低频响应:(1)在鉴频输出(集成块第(23)脚)与功放输入(集成块第(24)脚)间的耦合电容C1上并接一3～
Currently, the AM / FM pocket-sized radios assembled with Sony’s “CXA” series manifolds have a large social presence. Listen to the FM radio with headphones, the feeling of high pitch is acceptable, but the bass effect is poor. In order to broaden the high-end frequency response, improve the listening effect, I try to make some minor changes to its circuit, received good results. The method is as follows: 1. Improve the low-frequency response: (1) Connect the coupling capacitor C1 between the frequency discriminator output (pin 23) and power amplifier input (pin 24)