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Sam’s Status Report for 4/30/22

This week I made significant progress on the electronics. The filter board has been completely tested and is ready for integration into the synth. I built a testbench using an STM32 and I2S DAC to drive signals into the analog board for testing purposes:

I was able to measure noise, channel matching, filter cutoff performance, and total harmonic distortion.

Here’s a test with triangle wave input. The first image is input, second is low pass filtered (higher harmonics removed), and third is with 60dB resonance (higher harmonics and resonance added back.)

In the final week, I will integrate this with the rest of the synth and connect it to our final microcontroller choice (Teensy 4.1). The main deliverable this week is oscillator code written in C to drive this board and also verify functionality after it’s completely integrated. We are still about a week behind in schedule, but given that we have no classes this week will still be able to get everything done.