LM386 Audio Amplifier
This
simple amplifier shows the LM386 in a high-gain configuration . For a
maximum gain of only 20, leave out the 10 uF connected from pin 1 to
pin 8. Maximum gains between 20 and 200 may be realized by adding a
selected resistor in series with the same 10 uF capacitor. The 10k
potentiometer will give the amplifier a variable gain from zero up to
the maximum.
lm 3876/lm 3886 50 Watt Audio Amplifier
The
10 Ohm and 2.7 Ohm resistors must be 1 Watt types, and all others
should be 1% metal film. All electrolytic capacitors should be rated at
50V if at all possible, and the 100nF (0.1uF) caps for the supplies
should be as close as possible to the IC to prevent oscillation.
The
supply voltage should be about +/- 35 Volts at full load, which will
let this little guy provide a maximum of 56 Watts. To enable maximum
power, it is important to get the lowest possible case to heatsink
thermal resistance.
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