This circuit was found in a documentation of the time. It consists of a receiver with two RF stages for the medium wave band. The audio power is on the order of 2 W.
In the figure we have the way to obtain an adjustable 1 to 10 mAconstant current source. The...
We found this circuit in an old General Electric documentation. In fact, PUTs are not common...
This alarm uses several sensors that directly trigger a sensitive relay. A larger relay can be...