The CA3020 integrated circuit was one of the first commercial types, sold in the 1960s. The circuit presented is from 1968 using a power stage with RCA transistors of the time.
This percussion circuit was found in an Electronics World of 1968. The transistor may be general...
This pulse generator was found in a 1967 publication. We can assemble it with the 2N2646...
This switched stepdown regulator was found in a 60s documentation. It makes use of unusual...