We found this circuit in the Electronics Experimenter Handbook magazine from 1993. L1 has 2 = 2 turns of 28 or 30 wire in the shape of 0.5 cm without core. The range reaches a few tens of meters.
This 3-channel transmitter for amateur analog TV from 902 to 908 MHz was found in a QST magazine...
The MC1455 integrated circuit consists of a version of the 555 made by Motorola. The circuit given...
The figure shows how to use the LM3900 to drain current from a load of up to 20 mA with the...