This circuit that generates a special sound was found in a Popular Electronics from the 90s. The base is the 555 and the transistors admit equivalents, and a power stage can be added.
This circuit was found in Signetics documentation from the 90's. The circuit performance curve is...
Found in 90's Electronic Engineering this circuit can be used to measure phase angles between two...
This circuit was obtained from a 1965 Radio Electronics. The semiconductors used admit modern...