Common collector stage (CB22226E)

This circuit employs an old germanium transistor. The circuit is from a 1950s publication and uses RC coupling.

Short circuit eliminator for batteries (CB9541E)
The purpose of this circuit is to produce a quick discharge on a shorted battery to attempt its...
Power Stage for Alarms (CB12353E)
This circuit can be connected to the output of alarms or sirens with the 555, CMOS or TTL,...
Modulated Siren CMOS 4046 (CB19087E)
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...