LM386N-1 DATASHEET PDF

To make the LM a more versatile amplifier, two pins 1 and 8 are provided for gain control. With pins 1 and 8 open the 1. If a capacitor is put from pin 1 to 8, bypassing the 1. If a resistor is placed in series with the capacitor, the gain can be set to any value from 20 to Gain control can also be done by capacitively cou- pling a resistor or FET from pin 1 to ground.

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All the versions are available in dual in-line package DIP , which is useful for hobby amplifier projects; however, the LMM-1 version is available in SO package, and the LMMM-1 version is available in mini small outline package. The main advantage of this IC is its bass boost function with the addition of only two external components.

If you are constructing this circuit on breadboard, then it is better to keep all the wires short, otherwise, increasing the gain to can introduce feedback noise. 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.

These pins are part of the feedback loop, and internally there is a 1. By connecting an external resistor and capacitor in series across these pins, any gain between 20 and is set. Circuit with Bass Boost A lesser-known fact about this chip is that it has frequency shaping capability. This mode is enabled using a single component and provides a nice bass sound. This is very useful if you are using a small cheap speaker and require it to produce more bass.

For the bass boost function, you simply need a series RC between pin 1 and pin 5. A capacitor of 0. IC Pinout The beauty of this chip is that it requires very few external components, which makes it ideal in applications where space is an issue. For students and hobbyist the PDIP version works well with breadboard layouts. LM Pin 7 Bypass This pin is for optional use, and for the most part in the documentation, the recommendation is that you leave it unconnected if you wish to build an amplifier with low gain and minimum components.

On the National Semiconductor version, if the gain is 20, then you may not require a decoupling capacitor from pin 7 to ground. However, with a gain of decoupling may be required. It may also be required for amplifier circuits with a gain of 50, oscillator circuits, and bass boost circuit. A switch connected between pin 7 and ground, or a switch connected between pin 7 and the positive rail usually causes the IC to mute the output.

However, this is very much an optional facility. Speaker Power Output.

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