This is a commercial circuit from the year 1958. Transistors are germanium types and transformers and coils are hard to fild today. The circuit is destinated to the reception of medium wave stations.
This signal injector circuit, an astable multivibrator, was found in a 1971 magazine. The circuit can...
This circuit that can only be used with simple resistive and inductive loads (never electronic) was...
This circuit activates a relay at dawn. The relay can be used to sound an alarm, turn on a radio...