Amplifiers, introduced in the early 1900s, are crucial devices that enhance signal amplitude, widely used in communication and entertainment. This project focuses on creating an audio amplifier for frequencies between 190 Hz and 18.1 kHz.

The design includes buffering the input signal with a source follower, filtering desired frequencies using low-pass and high-pass RC filters, and amplifying the signal by a factor of 11 using a common emitter voltage divider. Real-world resistances differed slightly from simulations, affecting performance, but similar resistances were used to maintain functionality, with testing confirming the desired frequency response.

The project aimed to create a multistage amplifier to amplify frequencies between 190 Hz and 18,100 Hz. Test results showed cutoff frequencies around 180 Hz and 20,000 Hz, which, while slightly off, were close enough to be considered successful. The buffer and equalizer stages performed similarly in real life and simulations, but I encountered issues with the gain stage, where measured values differed significantly from simulations. Interestingly, the amplifier's final output remained effective despite this discrepancy. Overall, the circuit functioned as intended, with the buffer stage achieving close to unity gain and the equalizer providing an acceptable frequency response.