• Building the Circuit and Testing the Properties

    Alvi Ahmed02/21/2019 at 21:18 1 comment

    Circuit being built:

    Oscilloscope Screen Shots:

    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.

  • Simulation in NI Multisim

    Alvi Ahmed02/21/2019 at 21:06 0 comments


    Input Voltage (10mV (pk-pk) @ 20kHz):  

    Output Voltage (5V (pk-pk) @ 20 kHz):

    In conclusion the schematic seems to be working well in simulation, therefore it is time to build it and see if the results hold in the real world.

  • Calculations of Audio Amplifier with both LM741 and LM318

    Alvi Ahmed02/21/2019 at 20:52 0 comments

    For LM741

    Pg 1:


    For LM318


    For this project I will be going with the LM741 version of the amplifier circuit. Even though the LM318 version of the circuit is cheaper, at this time I only have LM741 op-amps at my disposal.