MATRIXSYNTH: What the h_ll is a PLL? Digging in to the Doepfer A-196

Tuesday, February 24, 2026

What the h_ll is a PLL? Digging in to the Doepfer A-196


video upload by Sound + Voltage

"This time we're diving deep - perhaps too deep - into the mysteries of the Phase-Locked Loop, which Doepfer improbably made a Eurorack module for. So if you want to learn what that loop is and why you'd want to lock it, this is for you. All four of you.

No AI content, though I do use it for research.

Timeline:

00:00 - Intro
01:42 - What PLLs do
03:05 - How they do it
08:47 - How the 'over the radio' effect works
10:51 - Building a PLL out of spare parts
13:31 - PLL as a frequency multiplier
19:36 - Lots of stuff to try

External Links:

Doepfer A-196 PLL manual: https://doepfer.de/a100_man/A196_man.pdf
CD74HC4046A data sheet: https://www.ti.com/lit/ds/symlink/cd7..."

Patch notes: Make your audio sound like an FM broadcast with a PLL

video upload by Sound + Voltage

"Apologies for the long absence, but I'm back - this time with a patch I've been trying to make work for years: the effect of audio coming over the radio.

It was a complete surprise that this worked, I was just playing around with a phase-locked loop module. I didn't think this would end up being a video about FM at all, but when I stumbled on it, I had to share.

Modules in use: Antumbra Fade, Radio Music, Cap'n Big-O VCO, Doepfer A-196 PLL, Steady State Fate's Quantum Rainbow 2, and Void Modular Hexagram.

If you'd like to hear more of the background music, I released in in 2025 on the NEUS-318 label, and you can find it here: https://neus318.bandcamp.com/album/he..."

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