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.
The integrated circuit used in this filter is not very common today, but the configuration can be implemented...
This circuit with an optical path sensor was found in a 1995 documentation. The circuit fires...
This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a...