Friday, July 23, 2010

LM386 Based Low Power Audio Amplifier

About LM386

LM386 is a low power audio amplifier IC designed for use in low voltage consumer applications. You can use this 8-pin IC to amplify the output signal from your mp3 player or computer audio output. 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.

Applications of LM386
  • AM-FM radio amplifiers
  • Portable cassette player amplifiers
  • Intercoms
  • TV sound systems
  • Line drivers
  • Ultrasonic drivers
  • Small servo drivers, etc.

The circuit below shows a simple audio amplifier using LM386 with a gain of 200. If the 10uF capacitor connected between pins 1 and 8 is taken off, the gain would be 20.  The gain can be adjusted between 20-200 by placing an appropriate resisor in series with this 10uF capacitor.


You can test this circuit with your mp3 player or ipod. The varying 10K resistor at the input is to control the volume of output audio.


Bren ECX said...

Hello May I ask a question?
for my project , Is it possible that the input of amplifier is contain 220 volt ac and the output of it is 3 volt using multitester, can you help for the schematic diagram,, can you help for what is the best thing i can do with my project?
thanks send me an email :))

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