Available as an assembled Module and as a DIY project.
This Module is currently available.
A simple Rectangle/Triangle LFO for your rack (V1.2 and later)
Simple LFO is a basic, yet effective, rectangle or triangle LFO with dual-speed-range and amplitude settings.
This is an updated version of the Simple LFO (V1.2 and later).
The front panel has been modified to include an amplitude potentiometer. The maximum signal can be now adjusted from +/- 10 V up to 0 V.
The LED can be bi color to visualize positive and negative excursions of the output signal.
https://www.davidhaillant.com/l/uploads/big/eba32428822c6fe0605b275d4e68b485.jpg
https://www.davidhaillant.com/category/electronic-projects/simple/simple-lfo/