76 Sawtooth Generator

76 : Sawtooth Generator

  • Author: Mooneer Salem
  • Description: Generates sawtooth waves for use as audio.
  • GitHub repository
  • Clock: 50000000 Hz

How it works

This project increments a counter from 0 to 25,000,000 and back to zero again. The current value of this counter is then passed into a PDM modulator to generate the output. Filtering it with a low pass filter (designed for use in the audio range, recommended cutoff ~30 KHz) and then amplifying the result will result in usable audio.

How to test

Add a suitable RC low pass filter to output pin 7. This can be probed by an oscillocope as-is. To listen to the audio, the output of the RC filter should be attached to a suitable audio amplifier.

IO

#InputOutputBidirectional
0PCM sawtooth wave output (bit 9)PCM sawtooth wave output (bit 9)
1PCM sawtooth wave output (bit 10)PCM sawtooth wave output (bit 10)
2PCM sawtooth wave output (bit 11)PCM sawtooth wave output (bit 11)
3PCM sawtooth wave output (bit 12)PCM sawtooth wave output (bit 12)
4Frequency left shift amount (in bits) -- bit 0PCM sawtooth wave output (bit 13)PCM sawtooth wave output (bit 13)
5Frequency left shift amount (in bits) -- bit 1PCM sawtooth wave output (bit 14)PCM sawtooth wave output (bit 14)
6Frequency left shift amount (in bits) -- bit 2PCM sawtooth wave output (bit 15)PCM sawtooth wave output (bit 15)
7Frequency left shift amount (in bits) -- bit 3PDM sawtooth wave output (needs LPF)PDM sawtooth wave output (needs LPF)

Chip location

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