I’ve created an analog VCO based in the SSI2130 chip. It features:
Main oscillator with various waveforms:
Triangle
Saw
Square/pulse
Sine/half-sine
Suboscillator with 3 different waveforms:
A voltage-controlled mixer with:
5 channels (triangle, saw, pulse/square, (half) sine and sub)
an attenuverter of each channel
additional individual outputs for each channel
Coarse/fine tune and an octave switch
Exponential FM
Through-zero linear FM/PM
Hard and soft sync
The full schematic and BOM are on my GitHub page . I’ll create a little demo once I get my system back together. PCB/panel sets will be available soon!
19 Likes
Hugo_o
May 27, 2024, 10:18am
2
Magnificent work! I have a slightly off-topic question, but how do you do your panels?
TimMJN
May 27, 2024, 11:38am
3
Thanks! This is just an FR4 panel made by the PCB fab house, using silkscreen and HASL for the markings.
This is gorgeous. I would certainly be interested in a panel and PCB when you have them available!
1 Like
markeby
September 14, 2024, 11:12pm
5
I would like to see a technical description of the suboscillator and usage models.
TimMJN
September 14, 2024, 11:17pm
6
What technical description would you need besides the schematics I posted, and what do you mean by usage models?
markeby
September 14, 2024, 11:28pm
7
Sorry about that. I found exactly what it is. I hadn’t seen that before.
I have 6 of SSI-2139 oscillators (adding two more) in my prototype with software controlling all of the inputs. A large array of D/A converters interfacing. It is a work in progress.
1 Like
Looks awesome!! Looking forward to the demo. And I am definately interested in buying a PCB/panel set!
TimMJN
September 17, 2024, 5:46am
9
I think a proper demo might take a while. My system is still scattered in bits and pieces, and right now the job is hoarding all my time. Pcb/panel sets are available though! The whole thing is tested thoroughly on the bench.
Good evening TimMJN, where would I be able to purchase one of the PCB/panel sets?
