This circuit is from a 1968 Electronic Design. The circuit uses transistors of the time that can be replaced with modern equivalents. More stages can be used to get higher tension.
The TTL 74123 integrated circuit consists of a monostable that can be configured to generate...
This circuit, shown in the figure, consists of a variable gain amplifier with differential input...
This is yet another simple LED driving game circuit that appears in several other versions on this site....