45 Watt Single Chip Amplifier
This circuit is based on the National Semiconductor LM3876. This
device is capable of delivering as much as 56W of continuous
average power into an eight ohm load with 0.1% THD from 20Hz to
20Khz. Be sure to provide an adequate heat sink for the
package.
Use log pots for volume, bass and treble. A stereo amplifier can
be built using ganged pots and a Stancor 402 transformer instead of
the 401.
Note that the delivery of power to the speakers is primarily a
function of the power supply voltage and capacity in Class A
amplifier. In our case, we're using a +/- 33 volt volt supply which
is designed around a Stancor RT401 transformer. Use extreme caution
when working with line voltages.
45 Watt
Single Chip Amplifier Diagram