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.
The circuit shown in the figure is indicated for alternative sources of energy, such as those...
Using the well-known 2N2646 that was popular at the time, this circuit was found in Radio...
This circuit monitors the current in the loads. The NPN and PNP transistors admit the BC547 and...