Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

10 Hour Timer (CB1535E )
This circuit was obtained in a 1974 Motorola timers publication. Transistors allow equivalents, the 2N2646...
Debouncer (CB4811E)
This is one of the many anti-deboucer circuits the reader can find on this site. The base is TTL...
Electronic Shower (CB4655E)
This circuit, found in a 1994 documentation, uses 20 A 2N5448 triacs or equivalent and should be...