This circuit was found in a 1945 publication. The circuit was stated to be part of a walk talkie. Note that, as it is a portable assembly, it was powered by batteries. The jack was for microphone insertion.
This circuit can be used to activate the lamp when it gets dark. We found the circuit in old...
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
This circuit generates slow interval steps for controlling stepper motors. The circuit has two...