Uploaded December 2021 | Updated September 2026, 5 minutes ago

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In the episode of #DOScember we will be exploring the #COVOX DAC. We go into the some high level DAC theory.
Then we will #SMD solder my own designed #PCB
The we will #program some oscillators in #assembly
And finally a very rudimentary PCM implementation in assembly

Code, Schematic and Gerber files:
github.com/rdoetjes/tuts/tree/main/dos/covox

Chapters:
00:00 Intro
01:03 Theory of the N-Weighted Resistor DAC
01:54 Theory of the R-2R Ladder DAC
04:27 Soldering the board
05:16 Reflowing the board in the toaster oven
05:36 Soldering remaining components
06:10 Smoke testing the COVOX
06:40 Programming a SAW wave
07:18 Analyzing the saw tooth wave with a scope
07:34 Programming a SINE wave
08:25 Analyzing the sine wave with a scope
08:36 Increasing frequency of sine wave
09:04 Programming a PCM "hello" sample
10:54 Playing the noise PCM "hello" sample
11:03 Increasing frequency of PCM "hello" sample
11:16 Playing the noisy sped up PCM "hello" sample
11:22 Outro
12:37 MOD song and titles