This small analog TV transmitter was found in an Electronics Now from the 90s. The range is around 20 meters, and the coils are according to the channel on which you want to receive the signal.
This simple expandable circuit was obtained from a Popular Electronics from the 80's. The supply...
This circuit in the National Semiconductor Fast IC Power Transistor manual uses a special power...
This simple injector circuit can actually be powered by voltages from 3 to 9 V. The frequency is...