This high current switching stage was found in a 1967 EEE. The power transistor is from that time. The peak current can reach 30 A.
In the figure we have the way to implement a NO OR or NOR gate with an operational amplifier. The...
Old phones with dials can be used in a simple home intercom system, as this circuit from Popular...
The pulses applied to input C of the SAA1027 integrated circuit determine the engine speed. Each...