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MFOS Ultimate LFO CV Input modification?

Discussion & Documentation for Ray Wilson's synths, modules and noise boxes.

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johnstilton
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MFOS Ultimate LFO CV Input modification?

Post by johnstilton » Mon Feb 11, 2019 12:40 pm

I am planning a build of the MFOS Ultimate+Expander and am reviewing all of the potential Mods and tweeks both on the MFOS site and on these forums.

One feature that I would like to implement is giving a CV input for the frequency of the LFO, but I have found nothing about such a modification.

I would imagine that a CV input could be added as a parallel circuit to the inverting input of U24-B, buffered with a 100k (?) resistor.

http://musicfromouterspace.com/analogsy ... _schem.pdf

Or maybe someone had already added this functionality to their build and can share their solution?

Thanks.

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Bodo1967
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Re: MFOS Ultimate LFO CV Input modification?

Post by Bodo1967 » Tue Feb 12, 2019 2:40 am

johnstilton wrote:I would imagine that a CV input could be added as a parallel circuit to the inverting input of U24-B, buffered with a 100k (?) resistor.
I haven't tried it, but that sounds reasonable. Perhaps just try and test it during the build - it's only a resistor, a bit of wirde and a jack after all :D.
... why buy it for $100 when you can build it yourself for $150?

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johnstilton
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Re: MFOS Ultimate LFO CV Input modification?

Post by johnstilton » Thu Aug 06, 2020 10:23 am

Update: It didn't work. Oh well.

jonnyjupiter
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Re: MFOS Ultimate LFO CV Input modification?

Post by jonnyjupiter » Mon Nov 09, 2020 2:23 pm

Did you compare the circuit to the VCLFO module circuit on the MFOS site?
I bought the VCLFO and have just finished populating the Ultimate PCB, but haven't compared the two circuits.

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johnstilton
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Re: MFOS Ultimate LFO CV Input modification?

Post by johnstilton » Tue Nov 10, 2020 6:49 am

I did compare them. They are significantly different

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CrysWiz
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Re: MFOS Ultimate LFO CV Input modification?

Post by CrysWiz » Tue Jul 06, 2021 11:45 am

I used Vactrols.
turning the world on its ear since 1981

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