The LH1605 integrated circuit is not a common component today. The circuit was found in the 1994 National Semiconductor Linear Applications Handbook.
We found this circuit in the 1982 SGS Linear Integrated Circuits Manual. Diode D1 prevents the...
This circuit is from an English publication from 1976 but can be easily assembled with BC548...
Because it uses TTL integrated circuits, this siren must be powered by 5 V or as indicated with D1 to...