I have built a version of the Moritz Klein sequencer with a switch to chose between a 2.5V and 5V voltage range. I never use the 5V range. And most of the time I feel that the 2.5V is even too imprecise: therefore, I am planning to alter the module so that I can chose between 1V and 2.5V ranges.
In line with Craig’s message, I really would like to suggest lowering the range to 2 octaves, so between 0V and 2V.
You could take a hint from typical VCO designs: For each step, a coarse and a fine frequency control. Coarse with a 7 volt range and fine with 1 volt, for instance.
To me the downside would be, that this renders the sequencer pretty useless as a modulation source for anything else but vco frequency
Just add I built the electric druid VCDCO which has 32 waveforms on the wave CV, it was impossible to select a waveform consistently in the pair of DCOs, I actually swapped the 10k pots out for multiturn pots, you might want to consider this if you stick with anything over a 3 octave range.
I can easily lower the voltage range, but I agree with @Softek that there are also use cases for CV values covering a large voltage range. Using multi turn pots would be more practical than coarse and fine control pots on a 16 step sequencer, though (and would maybe eliminate the need for a quantiser). The analog gear I’m currently controlling with it also responds to midi, so I can set an offset via a daw. But to combine the sequencer with midi sort of defeats the purpose of building a harware sequencer.
Decisions, decisions …
Of the 15,929 items listed on mouser.com under potentiometers, 33 survive a filter on multi turn. Of those 7 are stocked and available in single unit quantities (others are non stocked and minimum 270), and the cheapest are $24.59 each. Of course I’m sure you can do better elsewhere, but don’t expect a lot of options or very low prices.
Good point, did not consider that modulation source part.
Maybe using a rotary switch to allow for more voltage ranges?
Using a rotary switch could save costs, as it does not require multiturn pots or fine+course pots, as a single pot per step would suffice.
Multiturn potentiometers? It depends. I can easily find multiturn potentiometers locally. EUR 6.80 for 10, 20, 50 and 100K, twice as much for other less common values, but still half price compared to Mouser.
I find single turn A1M potentiometers impossible to get though! I can only get them in a couple of stores, and they only stock the Piher brand which is expensive and impossible to fit on the smaller PCB footprints. I have to resort to Tayda for the “alpha type” ones, pay all the import taxes, and still have to kludge them onto a panel 
It’s really wild sometimes. Like, I found a metal can CA3080 in a shop, but they didn’t stock 100nF capacitors, or any potentiometers. At all. Go figure. 
I think I paid around £2.50 for my 10k lin multiturn pots, only thing to watch out is the shaft diameter, mine were 6.3mm so getting the 6mm knobs on was tricky and required some adjustments.
Even at that it’s EUR 108.80 for sixteen of them… I’m too much a cheapskate for that.
I got some more work done on the MFOS ADSR. This is one of two boards wired except for power. Cable ties and hot glue for the win.
I built a remote control for Patternate-O-Matic, the sequencer I’ve been working on. This is a short demo of it:
Making a video to show all of the sequencer’s possibilities is a lot of work. Too much work. I’ve decided not to spend any time on that. As a compromise I have however written a manual. Given that I have a bad memory I needed one for myself anyway. When I’ve finished testing the device you can find all code, gerbers etc. etc. on my github. For the moment you can only find the manual there.
There is another short video on instagram showing the sequencer:
Another mystery module on a prototype 3D printed panel:
(Looks good, but needs a Zener I don’t have yet…)
Delay module that has two settings: low fidelity and no fidelity.
But that’s what you get with an Arduino Nano. The no-fi setting goes to something like two or three seconds, but then output barely resembles what went in. And that’s whole the idea of this.
It’s a curse which befalls all of us
Trying to get switches right way around fails more than it succeeds. I have begun to not even look at how they are placed and get it right 50% time, which is an improvement.
Barton JFET Phaser, Kosmo format
Repo: Barton_JFET_phaser · main · Richard Holmes / frontpanels · GitLab
For a moment I thought there was something wrong in my vision as I had no idea that Barton had designs with stacked boards 
I think you probably mean “Barton instructions”, and not Kassutronics?
