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有线广播在我国(特别是农村)已流行几十年,但农村的大部分地区至今仍然使用着传统的有线广播。它之所以有这样大的生命力,一是架设有线广播网容易、便于推广;二是经济实惠,容易使广大农村用户所接受。但它又因为是几十年前的产物,毕竟会存在一定的缺点,例如,使用舌簧式喇叭音质差,信号在传输线上的损失使远离广播站的听众往往感觉到音轻。因此,改善音质和提高音量是广大农村听众迫切需要解决的一个课题。有线广播放大器正是根据这个问题提出的,农村用户使用带有放大器的有线广播,能较好地解决上述问题。本放大器的实质是音频放大器,图1是用分立元件构成的OTL音频功率放大电路,它适
Cablecasting has been popular in our country, especially in rural areas, for decades, but much of the rural area is still using traditional cablecasting today. The reason why it has such a great vitality, one is easy to set up a cable radio network, easy to promote; the second is affordable, easy to accept the majority of rural users. However, because it is a product of a few decades ago, after all, there will be some shortcomings. For example, the use of reed speakers is of poor sound quality. The loss of signal on the transmission line often causes the listeners who are far away from the broadcasting station to feel light. Therefore, to improve the sound quality and increase the volume is the urgent need to solve the majority of rural audiences a subject. It is precisely based on this issue that cable broadcasting amplifiers are put forward. Rural users can use cable broadcasts with amplifiers to better solve the above problems. The essence of this amplifier is an audio amplifier, Figure 1 is composed of discrete components OTL audio power amplifier circuit, which is suitable