Triple Function Generator project

Project description:

I want to make a Triple Function generator based on the Sandin/LZX design.
The function generator is very cool if you use it to re-colorise the B/W Luma input .
Especially with camera feedback, this gives very beautiful results.
Each generator stage can be used individually too.


  • 3x shaper for re-colorizing the B/W Luma video input and other processing
  • normalised inputs


  • extra gain & span pots? See Grant Richters adapted schematic below - to be tested
  • main pcb + control pcb + panel pcb
  • feedback? - to be tested and checked if this is interesting.
  • CV control? if this is possible. please help!

Note: this project is directed towards DIYers and is open source.


basic layout , gain to be tested


so I love the function generator too! these are fantastic modules I have an idea though…

how about a single function gen whose three levels are normalled to the inputs of function generators 2-4

input into function gen 1
High band (from function gen 1) out into function gen 2
mid band (from function gen 1) out into function gen 3
low band (from function gen 1) out into function gen 4

I am in no way electronically inclined so I’m not sure if that is how this circuit works at all

I’m following along with this one too

I’ll probe the circuit at some points, let’s see if I can tap certain stages and give them a output.

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I had an idea:

option 1:
single pcb + a single FG panel

option 2:
3x single pcb + a triple FG panel

I have the layout of this direction done. I just have to make the panel pcb’s
I might add some extra functions, I have to test those first.
For the triple option, I want to have some normalled connections, which can be achieved by interconnecting the pcb’s (the “NORM” pads)
The pcb’s use right angled 9mm pots and are relativly shallow when mounted to the panel. (3.5cm)
ps: if anyone has a footprint of a rightangled dpdt switch, let me know!


I love the idea of a triple FG. I have been thinking this would be nice paired with a triple Differentiator if that is something you might be interested in putting together.

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look at my Differentiator VC feedback project page.
I want to aim that project more to a “newer” idea. If I also want to make it triple, it will become a very big project that cannot be made easy in TH parts I think (or it will have several pcb’s sandwiched together.)

But I will keep it in mind :slight_smile:
maybe it can be done?

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I have 3 Funk GenZ and can confirm that the fun factor is high.

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Indeed :vampire:

especially with colorising video input in a feedback setup , amongst other uses

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I’m working on the triple panel now. it is 16HP right now.
pot & jack positions will change , because I might add a pot in the design.
(and I have to check if the panels will fit sideways. )
work in progress :sunny:


a more final design. (almost)
sideway mounting fits. 14HP