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EchelonForce / vclfo10

A Eurorack LFO design based on the Electric Druid VCLFO10 chip.
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Q's regarding reworking this LFO #1

Open KeLaiFu opened 8 months ago

KeLaiFu commented 8 months ago

Hey, first of all, thanks for sharing this monster of an LFO. I have just built it and it's sat in my rack intimidating any 4hp LFOs I have nearby. I have a few questions, I hope here is an appropriate place to ask. Firstly, why did you opt for the 358 opamps over the usual TL07X ones? Second, If I wanted to remove a CV in jack, would it be as simple as just removing it from the schem, as the jacks seem to just patch on to the input coming from the potentiometer.

I plan to make a slightly smaller, reformatted layout to match my other modules, I've got a rough plan but I always end up with a spare jack lying around ruining the feng shui, so I was hoping I could take one out, and maybe use some quad opamps to get the parts down a little.

EchelonForce commented 8 months ago

Hi, glad to here someone is trying out the design! And yep it's fine to ask here or over on the website comments, whatever works. I would expect 358s and TL07x's are interchangeable here. I probably just had a lot more 358s at the time. In the tinyurl's on the schematic there are simulators for the sub-circuits so you could experiment with the op-amp parameters in there, but at audio/lfo frequencies I don't think it matters. You should be able to remove any of the CV jacks, the schematic has switched jacks but it doesn't use that function so removing a jack is just like removing a cable. If there's no jack then that input to the chip doesn't really need to be supplied by +/-12V or run through op-amps, a potentiometer hooked to 5V would work (I think that's what's in the chip's reference schematic).

This was one of my earlier designs. There's a lot I would probably do differently now, quad op-amps would be one of those things.

Make sure you look through the v1 issues on the website: https://www.robotdialogs.com/2022/09/eurorack-lfo-module-vclfo10.html

KeLaiFu commented 7 months ago

Thanks for the reply. Yep, currently your overkill LFO found 3 homes here in our SDIY group and I used your mixer layout and a few others in my own modules, so your work is finding a home.

I appreciate the info about the module, I will experiment a little, if I am feeling brave I may use some quad opamps as that would be a help to my revised layout.

Thanks again, and hope to see more added to Robot Dialogs...