100 mA regulator (CB21168E)

This 2-terminal regulator was obtained from a 1990s National Semiconductor manual. The components admit modern equivalents.

Modulated Siren (CB13036E)
The automatic modulated siren circuit shown in the figure really produces an interesting sound...
28 V x 3 A Switching Regulator (CB24281E)
This circuit was found in the August 1973 issue of Radio Electronics magazine. The Darlington...
Unijunction Modulated Siren (CB11821E)
This circuit has three settings, central sound frequency, modulation speed and modulation depth. The...