Voxmachina SIGMA Function / Ramp Generator DIY PCB Kit Attenuator As this is a passive

As this is a passive module

A little headroom has been added to create a nice saturation kind of effect if desired

without any signal set the BIAS so that the LED has no colour

Assuming an AC signal at the input

The 4NOT is essentially just a comparator

Voxmachina SIGMA Function / Ramp Generator DIY PCB Kit Attenuator As this is a passiveA modern approach to the Serge ramp generator, provides v oct control and is also oscillating by default unless something is connected to the trigger input channel, provides multiple outputs, BP, DC and AC coupled outputs, also EOC and ! EOC outputs, when self patched for example from AC output into CV input can be used to modulate curve to be linear or exponential, also provides a switch to change modulation target to be ramp rise, both or ramp fall.