Using a min/max analogue logic module as a phase comparator. Inspired by dougcl's classic PLL patches (1, 2) and this post by Giftnudel.
PLLs seem to be a hot topic again. The jury is still out on whether they're used in the Buchla 259. Make Noise and WMD have announced PLL-equipped VCOs. They form part of the Wogglebug's chaotic heart and can be heard sputtering in the Hertz Donut's bad tracking modes.
I'd read about the inner workings of Doepfer's A-196 and PLLs in general in Horowitz/ Hill's Art of Electronics, but only just tried Giftnudel's patch. The A-196 employs a linear VCO, but as you can hear, the patch works just as well with standard, exponential VCOs:
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2 comments:
Super cool. I had no idea the min max could be used this way.
Thanks Navs, another informative post. I just sold my PLL (which I bought after watching Doug's excellent video) but I kept my Min/Max so I'll give this a try.
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