![]() Alternatively, it is much cheaper to buy a readymade module online for 99p and it works far better due to short tracks and SMD components. If you are constructing this circuit on breadboard, then it is better to keep all the wires short, otherwise, increasing the gain to 200 can introduce feedback noise. The main advantage of this IC is its bass boost function with the addition of only two external components. ![]() The low power audio amplifier used in this project is fed with an external +12V DC supply through pin 6. However, if required one can replace the low-power amplifier with high-power ones. It is a must to use IC LM386 (IC 1) along with that amplifier. The LM386 is a mono amplifier IC with a default fixed gain of 20, and may be set to 200 (gain = 200) after the addition of a 10 ♟ capacitor between pin 1 and pin 8. The circuit diagram of low power audio amplifier is shown in figure 1. All the versions are available in dual in-line package (DIP), which is useful for hobby amplifier projects however, the LM386M-1 version is available in SO package, and the LM386MM-1 version is available in mini small outline package. As shown below, the LM386 works with large electrolytic capacitors, which makes it bulkier and costlier, and causes it to be prone to distortions with age. However, the LM386 is not perfect and has a few drawbacks and limitations. There are three versions of this IC, LM386N-1, LM386N-3, LM386N-4, capable of providing power output of 0.125 W, 0.8 W, and 1 W respectively. The LM386 based amplifier is still very popular as one of the smallest sized amplifier chips. ![]() The LM386 is a low voltage audio amplifier IC manufactured by National Semiconductor.
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