This site is a public home for some personal projects of a retired electrical engineer.   It is an attempt to document things I find interesting, or that puzzle me,  or that I am just curious about.

Most of the entries are  circuit simulations using QucsStudio by Michael Margraf, DD6UM, freely available here  .  Note, the current version of the program has been renamed uSimmics, so my slides will begin to use that name, as I migrate to it.  Also helpful, especially for digital  simulations, is Micro-Cap 12 SPICE by Spectrum Software, freely available here .