Audio power amplifier

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

Report

• Project report: Effektforsterker for lyd (Norwegian)

Circuit

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

Final

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

Measurements

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).