This circuit is from an Electronics World of 1967. The described calculations can be applied to equivalent circuits with modern transistors.
This TTL siren is formed by two oscillators using each two Gates of a 7400. Frequency or the...
We found this circuit in the 1982 SGS Linear Integrated Circuits Manual. Diode D1 prevents the...
This circuit is from old documentation, but can be easily assembled as components are still...