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hackaweek.com writes:
I love the LM386. It’s a complete amplifier in an 8 pin DIP chip! All that is needed to build an audio amp are a few external components most of which are decoupling capacitors. It is well suited to low power applications and runs just fine on a 9 volt battery or any voltage supply from 4-12 volts. It has a low quiescent current drain of only 4mA so it won’t kill a battery right away if you leave it on and idle. The gain is internally set to 20 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. An increase in bass frequency can be facilitated by adding a 10K resistor and .033 uf capacitor in series between pins 1 and 5.
The 1/2 watt LM386 Audio Amplifier – [Link]
One Response to “The 1/2 watt LM386 Audio Amplifier”
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May 17th, 2011 at 12:59 am
The datasheet for the LM386 opamp does not have the 0.01uF input capacitor used in this circuit. This capacitor cuts frequencies below 320Hz so it causes no bass like a telephone. Get rid of this capacitor.