Found in a 1990 Hobbyst Handbook this circuit has an output power of a few tens of watts and serves as reinforced for the car's sound. The speaker can be 2 or 4 ohm.
This control circuit or reversible contactor was found in a 1967 General Electric manual. The...
This is one of the many versions of amplifiers with LM386. This was achieved in an old publication (1981). The...
This two-phase stepper motor circuit was found in an old documentation using an operational amplifier...