A noise & random voltage source is one of those must-have modules that every system has to have. I built the YuSynth one from Yves Usson for my system; his design incorporates a nice sample & hold module too.
I worked out a stripboard layout for this (not completely successfully – if I did this again I’d build it on one board). If you’d rather have a PCB to work with, Soundtronics do a PCB and a full kit (and Yves gets paid for his efforts, which is great). Because of this commercial consideration, I’ve chosen to not publish my stripboard layout for this module as it potentially takes income away from the creator
My panel design and cutting guide are available below as 600dpi PDF files. Note that I’ve not included holes for mounting hardware in the cutting guide as these can vary from system to system, depending on your mount/rails/bit of timber of choice. Note also that I use M4 PCB standoffs – you might want to cut the 4mm holes to a different diameter, depending on your standoff of choice.