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.
Originally recommended to give a tone of transmission in equipment of the 60s (tubed) this circuit is...
Found in a 1967 Electronic Design, this circuit operates in a range of 0 to 1 V input with...
This small transmitter circuit has a range of about 100 meters, and the antenna must be connected to...