100 mA regulator (CB21168E)

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

Unijunction Pulse Generator (CB24252E)
Sawtooth Generator 7413 TTL (CB19420E)
This circuit was found in an old European documentation, but it is still current due to the...
Line amplifier for UHF (CB9168E)
This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very...