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 is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....
This circuit, which combines a bipolar with any JFET, was found in the April 1993 issue of...
This filter was found in a Texas Instruments manual based on an operational amplifier 741. Other...