This timer was found in English documentation from the 80's. The integrated circuit is common nowadays and the MOSFET admits equivalent according to the controlled load.
This simple radio was found in a Popular Electronics from the 90s. L1 and L2 have 100 turns on a...
This circuit was found in Radio Electronics magazine from the 90's. The circuit is for small NiCad...
This automotive circuit was obtained from an 80's schematic from the integrated circuit factory...