So im finally sorting out the use for that oscillator link cable!
I have a digital vco on the breadboard, and I realised before this I should probably actually have a use for that link cable!
any requests?
the plan is. and ill share the schematics before I build these ones! worth getting em right.
It will have a portamento and a bunch of inputs
also a octave +1,+2,-1,-2 switch also. the plan with the octave reference voltage, I haven’t tried it yet but theoretically. I use a reference voltage of +2v. would it be ridiculous for me to invert this reference voltage with an opamp to get the - reference voltage? this is a method I haven’t tried before. but with the oscillator driver it woulds want to also be able to take away as well as add. so maybe its worth the 4v being spread + and -.
This module is going to be 5cm wide with
octave knob
fine tune knob
CV input
CV 2 input with attenuator
portamento knob
PWM input
CV output
then this will connect via 3 ribbon cables to the back of 3 oscillators, which will also run off to the shared module on the other side
Then there will be another module 5cm wide on the other side which will have a mixer for the 3 modules. to mix between the 2 signals coming out of the ribbon cable.
BlockquoteThen there will be another module 5cm wide on the other side which will have a mixer for the 3 modules. to mix between the 2 signals coming out of the ribbon cable.
what do you mean “on the other side”? aka do i need to save 5 or 10cm in total for this? cheers
sorry, I mean there is an oscillator driver on one side of the oscillators which is 5cm wide, then on the other side (the right im guessing) there will be a 5cm wide mixer module that also connects to the oscillators from the back.
which I will also include on the mixer a preset offset trimpot so 1222’s can be unipolar or bipolar.
you can use it to drive 2! also ill bring out other oscillators soon that will be compatible with this too. cross contamination oscillator and a digital oscillator.
It looked like I’d build my 20th oscillator. I was sorting out the materials for 20 of them. I was only uncertain how many were for my own Kosmo. I’m very excited for the CEM3340 / AS3340 oscillator, cross contamination oscillator and digital oscillator to have a driver specification. I’m intrigued by the digital oscillator. Is it anything like a Korg Poly-800? There’s no telling what would be improbable to the expansion of the voice!
@lookmumnocomputer Just a general remark. It strikes me that in your design you use quite a few opamp circuits where the opamp is used as an inverting amplifier. Nothing wrong with that but sometimes a non inverting opamp circuit can do the same and this saves you from using another one to return the phase of the signal back to its original value (and thus saving you from needing an extra opamp).
Inverting has the advantage that both inputs are held at 0 V, instead of following the input signal around, so there’s no risk that you run into common mode input issues (i.e. getting too close to the supply rails; e.g. the TL07x series cannot handle voltages below ~4V over the negative rail, see here).
I came here today to ask about Portamento and the OSC Driver and voila, you beat me to it with this announcement. lol
I found some really simple yet satisfying cct’s for glide/slew/porta… last night as i delved into that learning curve via the interwebs.
maybe i missed it in the discussion but if not, Noise Generators or Polyphonic in the future?
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