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The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200. The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the LM386 ideal for battery operation.
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1 x LM386 Audio Amplifier IC
|Product Category||Audio Amplifiers|
|Package / Case||PDIP-8|
|Supply Voltage||12 V|
|Supply Voltage||4 V|
|Maximum Operating Temperature||70C|
|Minimum Operating Temperature||0C|
|Number of Channels||1 Channel|
|Operating Supply Current||4mA|
Terminals 1 and 8 represent the gain control of the amplifier. These are the terminals where you can adjust the gain by placing a resistor and capacitor or just capacitor between these terminals. In this circuit, we will place a 10µF capacitor between these terminals for the highest voltage gain.
Terminals 2 and 3 are the sound input signal terminals. These are the terminals where you place the sound which you want to amplify. Terminal 2 is the -input and Terminal 3 is the +input. In our circuit, the positive sound signal will be placed on terminal 3 and terminal 2 will be tied to ground.
Terminal 4 is GND (ground) and will be tied to ground in the circuit.
Terminal 5 is the output of the amplifier. This is the terminal in which the amplified sound signal comes out.
Terminal 6 is the terminal which receives the positive DC voltage so that the op amp can receive the power it needs to amplify signals.
Terminal 7 is the Bypass terminal. This can bypass 15KΩ resistors. This pin is usually left open or is wired to ground. However, for better stability, a capacitor is added in our circuit because this can prevent oscillations in the op amp chip.
Know you IC: LM386
LM386 Audio Amplifier