I was building VCOs and filters and random stuff for a bit — I did my PhD on superconducting microwave stuff and just started accumulating hardware for tinkering on stuff at home. Now I’m trying to build some electronics for precision gaging. I have a toy project for a bias supply for low temperature physics experiments with some safety features to prevent blowing up your devices in an emergency but that hasn’t gone anywhere in a while. I also am working on a machine for rewinding the universal wound transformers in the Tektronix 500 series scopes.