This is an AM radio power amplifier circuit. What is different with
other general amplifier is that this circuit has a low-pass filter
(passive type), built using R1C1 to limit the input-output frequency
response. Additionally, a ferroxcube K5-001-001/3B with 3 turns of wire
is used as ferrite bead at output filter. All components should be
spaced very close to the IC.
The ground and speaker lead must be
twisted tightly. The supply lead and supply ground also must be twisted
very tightly. Here is the schematic diagram of the circuit.
Audio Power Amplifier for AM Radio Circuit Diagram
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