Category Archives: Electronic projects

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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Ground is Not your Negative Rail

Unfortunately, the PSU you just bought isn’t adequate for your Eurorack system?
It’s common to be confused by the “-V” label.


Yes, “-V” on a PSU is a “negative” output, but only compared to the positive output. Your synth needs more!

So, what is the difference between “-V” and “ground”? How to select and use a proper power supply for your Synth?
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Choosing a suitable adapter for the MDPS

Unknown Wall Wart Adapter
If you want to power up your Mini Dual Power Supply, you need to supply it with an AC voltage on its input.
You can either use a simple tranformer or, safer and easier to manage, use a AC/AC wallwart adapter.
It’s not easy sometimes to make distinction between an AC to DC adapter and an AC to AC adapter. They share the same form factor, the same look and feel. But there are clear indications to help you determine the type of each one.
Here’s a quick comparison between the two types with two example closeup pictures, one AC/DC adpater and one AC/AC adapter:
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