This TTL time base for 60 Hz or 50 Hz can be used in instrumentation circuits or even with microcontrollers, serving as a precision shield. The circuit is based on 7400 NAND ports and two transistors.
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...