Interesting projects!
I have a couple I am working on currently. One is a electrical circuit simulator, dedicated to the circuits in electric guitars and basses. All of the various circuit parameters are selectable from preset lists, and the output is in the form of a frequency response plotted on a log/log graph - decibel vs frequency. In addition to the parameter selection controls, the control panel also includes sliders to operate the potentiometers (volume and tone controls) in the circuit. The simulation also generates a schematic diagram of the circuit being simulated.
The other, somewhat related project is a network analyzer (not computer networks, but electrical networks). I actually began this project to collect some electrical component data for the circuit simulator project. Electrical components typically have rated values. Musical instrument pickup coils typically do not. So I needed a way to measure those values, as they are needed in the simulator program.
I tried using the PC audio line in and line out with electrical buffering of the input and output, and I found surprisingly good frequency response at 44.1 K sample rate, 20 Hz to 20 KHz. I expect even better performance at 96 K samples, if available. And of course any deviations can easily be calibrated out in software.
The output of the network analyzer is, like the simulator, in the form of a decibel vs frequency graph. It also provides an oscilloscope display for monitoring signal levels and phase.
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