I use the 74HC294 programmable clock divider to derive some clocks from a 16MHz oscillator. After a little test on the breadboard i thought about a little box to select all the different clocks now available.. First thought: use more vintage 74HC and a rotary switch to create a MCU free project. But i am a MCU whore.. so yeah it needs an LCD and two buttons for UI. I will use a arduino nano and a 16x2 LCD. You can find all design files (firmware, hardware, 3d parts) on github.https://github.com/ringo2k/SquareWaveGenerator Ps: This is my first project on hackaday. I normally store my project data in folders an keep them locked on my HDD till... forever. So this is a great tool for sharing and also some documentation for me. So feel free to ask questions or talk about tech stuff.