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 voltage doubler provides a continuous voltage at its output that is twice the peak...
This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The...
This circuit was obtained in an Argentine publication from 1973. The original version uses...