Found in a 90s Siliconix documentation, this high voltage power supply uses components from that time. MOSFETs can be current equivalents.
This circuit turns a lamp on and off with alternate touches of a switch. Modern Darlingtons can be used....
An interesting option is the one that makes use of the MC3373 integrated circuit and which is...
This circuit using current components was found in an old documentation. It is a sequential circuit...