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AN355是日本松下公司生产的黑白电视机伴音通道集成块,其内部包括伴音中频限幅放大器、有源低通滤波器、差动峰值鉴频器、直流音量控制电路和音频放大电路等。其特点是:采用的三级差分放大器的中放增益可达75dB以上,伴音中放调幅抑制比可达40dB以上;采用直流音量控制,避免了电位器滑动噪声和交流干扰声;输出功率达2W,可直接推动喇叭工作。
AN355 is produced by Japan’s Matsushita TV black channel audio channel integrated block, which includes audio intermediate frequency limiting amplifier, active low-pass filter, differential peak frequency discriminator, DC volume control circuit and audio amplifier circuit. The utility model is characterized in that: the three-stage differential amplifier has a gain of more than 75dB in medium amplifier and an amplitude modulation suppression ratio of up to 40dB in a sound amplifier; the use of a direct current volume control avoids potentiometer sliding noise and interference noise; the output power reaches 2W , Can directly promote the speaker work.