Audio power amplifier

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This was a electronics course project, building an audio amplifier based around the LM1875 op-amp.


The circuit was constructed after calculating the amplification, upper and lower frequency band, according to the specifications.

Audio amplifier circuit.png


This shows the final circuit, mounted to a flexi-glass plate to balance the enormous heatsink and protect the bottom traces.

Audio amplifier side.jpg

Audio amplifier overview.jpg Audio amplifier bottom.jpg

Audio amplifier overview.jpg


Measuring the input and output signal using a oscilloscope will verify if the circuit is designed correctly, which it turned out to be.

Here the amplifications is about 25 (9.8V/0.4V).

Audio amplifier oscilloscope.png