This circuit uses uncommon Texas Instruments components today. The circuit is from an American documentation. Transistors are commonly used PNP. The display is 7 segment multiplexed.
Found in a 1968 documentation, this circuit provides symmetrical voltages determined by component...
Found in a 1969 Electronics World, this circuit is intended for amplifying analog cable TV...
This circuit is from an old documentation. The integrated circuit can be replaced by a modern...