Audio Amplifiers with LM386 IC

LM386 Audio Amplifier

• The LM386 Audio amplifier chip is a general purpose amplifier with a variable gain
• The device is suitable for driving a small 8 ohm speaker
• It operates from a single supply rail making it convenient in battery powered devices
• The device has a low quiescent current making it suitable for battery operated devices (4mA)
• The chip is supplied in a standard 8 pin DIL plastic package
• Take care that the chip has suficient space as it may become warm in use!!  
• Specifications

  Supply Voltage	4 to 12 volts
  Input impedance	50k
  Voltage gain	20 to 200 - set using external components
  Output power	300mW to 500mW
  Bandwidth	300kHz

  Parts required  R1 = 10k variable resistor R2 = 10 ohm C1 = 470nF C2 = 10uF C3 = 100nF C4 = 1000uF Electrolytic C5 = 10uF - sets voltage gain Spk = 0.5W, 8 ohm speaker IC= 8 pin LM386

  Circuit Diagram