All that is needed to build an audio amp are a few external components. I used sop-8 type ic.
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.
Parts List
LM368
100uF
220uF
10uF
0.047uF (473)
0.01uF (103)
10 ohm
10k V/R
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