Category Archives: MFOS SoundLab Mini Synth

MFOS SoundLab MiniSynth in SMT – 1.2 Update

This is an updated version of my SMT conversion of MFOS SoundLab MiniSynth!

I corrected all the small quirks I previously made. And I replaced a lot of the remaining THT components by SMT ones.
This version works very well Out Of The Box (and after a couple hours of soldering of course).

And I’m doing some laser tests:

More informations to come!

Debugging MFOS SLMS

I made some scope measurements to help understand and debug faulty MFOS SLMS in SMT version.
My scope is not very accurate and the tested unit is far from perfect, but at least, it gives a pretty good idea of expected signals on the Test Points.


First signal to check is VCO1 (TP201). Put VCO1 Frequency pot in middle position (50%), LFO and AR switches on Off position:

VCO1 Test Point (TP201) shows a Clean Sawtooth, from 0 to 4V.

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MFOS SoundLab MiniSynth in SMT

Ray Wilson was the guy behind Music From Outer Space. He was a huge contributor to the Synth DIY scene. He designed a lot of cool projects, offered kits, schematics and a huge amount of tips and tricks for beginners. He even wrote a book on how to build an Analog Synth. MFOS kits and PCBs are still available through various resellers (see synthcube).

Eurorack MFOS SLMS clone

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