100 mA regulator (CB21168E)

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

Low Impedance Preamplifier (CB13209E)
The integrated circuit can be replaced by more modern operational amplifiers like the 741. The...
Second order high pass filter (CB7522E)
Using a 741 op amp with symmetrical source, this circuit was found in a 1982 documentation. The...
50W Amplifier (CB23930E)
50 This transistorized guitar amplifier was featured in the November 1968 issue of Radio...