Speaker protection (CB8193E)

Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in case of amplifier failures.

| Clique na imagem para ampliar |

Water activated alarm (CB22076E)
This circuit was found in an English documentation from the 90's. Equivalent components such as...
Flashlight battery charger (CB9122E)
This circuit was found in an Electronics Now of the 80s applying to NiCad batteries of the time....
Stepper motor control (CB12763E)
The pulses applied to input C of the SAA1027 integrated circuit determine the engine speed. Each...