LM386 circuit features

• Battery operation
• Minimum external parts
• Wide supply voltage range: 4V–12V or 5V–18V
• Low quiescent current drain: 4mA
• Voltage gains from 20 to 200
• Ground referenced input
• Self-centering output quiescent voltage
• Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8Ω, PO = 125mW, f = 1kHz)
• Available in 8 pin MSOP package

LM386 circuit applications

• AM-FM radio amplifiers
• Portable tape player amplifiers
• Intercoms
• TV sound systems
• Line drivers
• Ultrasonic drivers
• Small servo drivers
• Power converters

LM 386 series output power (Pout)

• LM386N-1, LM386M-1 at VS = 6V, RL = 8ohms, THD = 10% is 250-325 mW
• LM386N-3 at VS = 9V, RL = 8ohms, THD = 10% is 500-700 mW
• LM386N-4 at VS = 16V, RL = 32ohms, THD = 10% is 700-1000 mW.

LM 386 amp circuit 20dB gain

LM386 Audio Amplifier with Gain = 20 and minimum part count.

LM386 audio amp 50dB gain

LM386 amplifier 200dB gain

LM 386 bass boost circuit

To make the LM 386 a more versatile audio amplifier, 2 pins ( pin 1 and 8 ) are provided for gain control. With pins 1 and 8 open the internal 1.35k resistor sets the gain at 20 (26 dB). If a capacitor is placed between pin 1-8, bypassing the built-in 1.35k resistor, the gain will go up to 200.

If a resistor is placed in series with the capacitor, the gain can be set to any value from 20 to 200. Gain control can also be done by capacitively coupling a resistor or FET transistor from pin 1 to the ground.

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