Mauno Tuominen's Sigma DIY Blog & 3D-oscilloscope Interface Eurorack Module

3DOscillo1 from Mauno Tuominen on Vimeo.

"First video of my 3D-interface to oscilloscope. Three VCOs are connected to X,Y and Z inputs. Phase and frequencies are adjusted. No sound. More information at:
http://sigmambient.blogspot.nl/"

"I have a great book 'Design Techniques for Electronics Engineers' from McGraw-Hill publications. In this book there is one very simple circuit that adds diagonal axis (Z-axis) to any normal dual-channel oscilloscope that can display X/Y lissajous figures. I decided that this is a good project to end this year. Pictured is my design of this circuit in Euro-modular format and the circuit schematics..."

Be sure to check out Mauno Tuominen's Sigma blog for more synth DIY.

You'll find posts on the TTSH 2600, Buchla Quantized Voltage, Nord MicroModular, LED Beat Frequency module, Twin Peak Filter, and more.

Sequencer - Seku

The Seku by Mauno Tuominen (http://www.studiomanus.com/seku.htm)."

"Heart of SEKU is CMOS 4520 dual synchronous divide-by-16 counter. RESET-in-jack must be normalised to ground when not used (16-step mode). Length of the sequence can be set to N by patching PULSE OUT from N+1 step to RESET IN jack. When no clock is connected to CLK IN sequencer can be manually stepped from STEP button.

CMOS 4067 1-of-16 analog switch is used for GATE, CV and PULSE outputs. Inhibit-pin of GATE OUT 4067-switch is clocked at the same frequency as the 4520 with 4001 nor-gate turning each GATE OUT off before turning the next GATE on. You can mute any one of the 1-16 steps with the STEP MUTE switch."


video upload by sigmambient

"Self made analog step sequencer controls Korg MS10 and Roland S100M synthesizers. First row controls MS10 pitch and S100M noise-drum gate. Second row controls MS10 filter-cutoff.
Synthesizer sounds are modified live when sequence is running. More information about SEKU and Sigma on www.studiomanus.com"

You might remember the SEKU from these posts (scroll).

SEKU Analog Sequencer

YouTube via sigmambient.
"Self made analog step sequencer controls Korg MS10 and Roland S100M synthesizers. First row controls MS10 pitch and S100M noise-drum gate. Second row controls MS10 filter-cutoff. Synthesizer sounds are modified live when sequence is running. More information about SEKU and Sigma on www.studiomanus.com"