C64 DC-DC Conversion Part 2: "The Fart of Doom"

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Here's the follow up video to the last one where I converted my Commodore 64 from linear voltage regulators to modern switching replacements. (Watch Part 1 here: https://youtu.be/I8OPUC47CIQ)

I did some more useable measurements with the scope and also address a problem with SID noise I dubbed "The Fart of Doom". Be afraid!

I found this particular mod done with the same converters I used in this pdf: https://ftp.fau.de/aminet/docs/hard/Retro-Computing.pdf
There's no mention of the problem I encountered so I wonder if it is specific to my C64. More research (and more videos) definitely needed here.

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C64
Commodore
DC
Switching
Converter
Regulator
5V
12V
SID
VIC-II
Heat
Future
Proofing
Follow up
Problem
Noise
Pop
Conversion
Mod
Retro Computing