Tining

Today tining PCB's with Rose's alloy. Boiling water with citric acid for deoxidizing; fast and good shiny result.

Yeeehhaa)

Today I found solution for wery well PCB's cutting. Tomorrow thinking about another Yusynth LFO module as additon for my modular. So, need to make PCB, need to cut workpiece, but I leave my dremel at home. I have small and lightweight makita's angle grinder with 100mm thin disk. Fast, accuracy and straight cut with minimum dust. Perfect!

Dremel's "speed click" is'nt best way for cutting PCB's, but it doesn't matter for sound.

Not perfect, just good. Double sided PCB with Jurgen's "Living VCO's" come out from second endeavour, fucking divergence..

Etching plant. Heating coil, dimmer, chines aquarium air pump, dropping bottle tube. Cat's tray. Express and very cheap.

Spend two days (!) for fighting with POSITIVRESIST, but have good result this evening.
Tomorrow - etching...

With Big Brother -)

Now my Moog SP have a perfect pair: DRM1 MkIII by Vermona. 72 knobes. True sound of old 808, 909 and many more. 
Many thanks to my friends Denis Tretyakov and Prokhor Selivanov for help with delivery.

DIY modular synthesizer

Today I start some notes about building of my first modular synth. It based by Yusynth and Juergen Haible schematics. Now I finish making PCB's films, after little design correction in AI.