More specifically, designing the circuit in such a way that the slew rate and cutoff frequency limitations of the op-amp do not affect the signal. Later on taking into account the DC offset when working with microphones.
The specifications of the circuit are:
Vi = 10mv (pk-pk)
Vo = 5V (pk-pk)
Desired Bandwidth = 100Hz - 20kHz
Aclo = 500 V/V
The audio amplifier will either be made from an LM741 or LM318, eventually I chose to use 2 LM741's for there cheaper price.
Initially, tests and simulations as well as lab work was done for the LM741 circuit. As seen in the oscilloscope screenshots the circuit works well to amplify the signal within the desired bandwidth (100Hz - 20kHz).
The next step of this project would be to use an actual microphone and amplify its sound so that it is audible in a small speaker.
Microphone planning to use => Electret microphone, Model #: 07-9
Speaker planning to use => McBridge AZ-30s
NOTE: The yellow traces are the input waveforms, whereas the green traces are the output waveforms.
Waveform results @ 100Hz:
Waveform results @ 20kHz:
It seems that LM741 amplifier circuit is working according to specifications.
Therefore the next step after this will be to apply the microphone and speaker circuitry and observe if it correctly amplifies the voice.
However it should be noted that further calculations will have to be made to avoid distortion and noise. I am mainly talking about the potential for DC offset and bias currents, which will have to be nulled out.