Eurorack DIY: Luthers SUB&DIV - Build and Demo

In this episode I'm buidling a module that Luther on Kristian Blåsols Discord have designed.
This time it's a CV controllable divider that can be used for controlling clock sources or as a sub-oscillator with programmable octave range.
Luthers GitHub:
github.com/Pie...
You can find all of my designs on my GitHub:
github.com/tki...
Some modules that I have designed myself are available in my Tindie shop:
www.tindie.com...
Thank you for watching!
#eurorack #synthdiy

[@jimmy_jamesjams_a_lot4171]

CMOS does not necessarily mean we’re building a Lunetta. But Logic CMOS is arguably the basis upon which the Lunettas were built. I love the idea of building about 44HP of a Lunetta style CMOS playground, mostly for drum rhythms. Thanks for sharing!

[@MeeBilt]

Ohhh, gotta checkout that Lunetta, thanks for your comment

[@AnalogDude_]

pretty cool, i have built my 2 octave sub oscillator using CD4013 than used pnp & npn transistors to make it bi-polar, it uses additional +/-5V power supplies with LM4040, so it has the same amplitudes as my Make Noise STO, Roland system 100 clone vco's. it sounds very cool.
You could also run the CD4000 series on bi-polar psu's +/-5V to achieve the same, just make sure the inputs are continuously tied to -5V via a 1M resistors or something.

[@MeeBilt]

That sounds interesting. maybe I should try the +/-5V approach on some build.

[@AnalogDude_]

@@MeeBilt You can use a simple LM4040 or 78L05 and a inverting opamp to have a bi-polar supply or 2 x LM4040, etc. you need special opamp like "opa2991" if you wanna draw more than 20 mA, this one delivers 75mA

[@AnalogDude_]

@@MeeBilt You can run it anywhere, as long you don't exceed 18/20 volts potential difference for Cd4000 series, but the same also works for 74HC(T) accept 5V potential, the T versions are good for translating 3V33 to 5V.
Waiting too see what you come up with.
: )
But try to build a new 2 oct sub osc, it sounds better if it's the same as your VCO.
Now you notice or maybe not that something is wrong.

[@AnalogDude_]

@@MeeBilt i have a ca 4 x 4 cm big pcb for just that exact function for using on breadboards , using opamps, a trimmer rather than fancy LM4040 or so, but with the right electrolytic capacitors and 100 nF at the outputs of them.