100 mA regulator (CB21168E)

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

Triangular to Sinusoidal Converter (CB6102E)
This circuit was obtained from Signetics documentation from the 1980s. The circuit can be...
Telephone Monitor (CB12655E)
This circuit of a 1978 American publication monitors a telephone line by triggering a relay. The...
Two Color Sequential (CB4409E)
This circuit using current components was found in an old documentation. It is a sequential circuit...