Two-Stage BJT Audio Amplifier

This amplifier module was built as a requirement for one of my electronics courses. The goal of the project was to develop an analog circuit capable of producing an 11V/V voltage gain which has an input impedance of 10kΩ can handle a speaker load up to 1200Ω (lower with an impedance transformer).

The circuit contains two amplifier stages; a CC amplifier to produce the target input impedance and a CE amplifier to obtain the target voltage gain. My final prototype met or exceeded all benchmarks including a low gain error and a high signal swing.

This project was great practice for analog signal processing and I used it to drive an 8Ω speaker with a 1200:8 impedance transformer. I also implemented a similar design measure magnetic field signatures from AC lines using a pickup coil.