The Frequency Filtering Bass Effect Pedal
The intent of this project was to construct a device that could take a signal from an electric bass, filter out certain frequencies, distort them, and then blend them back into the overall signal. Since this type of effect is not commercially available, the concept seemed like it was good enough to attempt to build. The device consists of a state-variable bandpass filter, a distortion circuit, a preamplifier for the unaffected signal, a blend circuit to mix the signals from the preamplifier with those from the distortion circuit, and a final amplifier to give the device an adjustable output. The key part is that everything is adjustable. The filter, amount of distortion, and everything else can be easily changed.
The results of the project were quite positive, with some unexpected possibilities arising that ended up being good things. While the research and building time took longer than expected, the final result is a fully functional bass effect that is very unique. The filter does a good job filtering out frequencies and the distortion effect that is in the circuit sounds excellent and can be adjusted to fit any desired tone.
One of the important requirements that the project met was that the overall cost should be the same or lower than the prices of other commercially available effect pedals. The cost of the materials used in the box was less than sixty dollars, and a good pedal costs between seventy and ninety dollars, so this was a success. If the cost could not be kept under the costs of similar devices than the project would have been considered a failure, but it definitely ended up being a great achievement.