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3khz Low Pass Filter and Audio Amplifier(LM386)

2015-01-05 22:04  
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This article briefly describes the 3khz Low Pass Filter and Audio Amplifier (LM386). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, can be more effective to grasp this principle. Do you know the circuit, for example, can understand and buy these components: LM386 .

This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audio. The schematic includes an audio amplifier that is designed to drive a standard audio head phone. The circuit is described in more detail in the receiver section of Dave Johnson’s Handbook of Optical Through the Air Communications. (this link is off-site)


Figure 1 



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