Category Archives: MFOS

MFOS is short for Music From Outer Space.
Ray Wilson is the original creator of the MFOS Synths, such as the Sound Lab Mini-Synth, the Weird Sound Generator, and many many more cool stuff.

The designs I publish here are adaptations of some of his original materials, modified for the Eurorack format.

Those variations are under the same copyright as Ray’s.

I only sell surplus prototypes PCBs.

MFOS Weird Sound Generator in SMT

Here comes my next conversion of Ray’s classic analog synthesizer, the Weird Sound Generator!

Eurorack version of MFOS Weird Sound Generator, with prototype laser etched front panel

This is the same process as for my previous SMT/Eurorack conversion of the Sound Lab Mini-Synth. The circuit is identical to the original, including component references.

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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.

Continue reading Debugging MFOS SLMS

MFOS Sound Lab Mini-Synth 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

Continue reading MFOS Sound Lab Mini-Synth in SMT