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 circuit was found in the November 1994 issue of Electronics Now magazine. The circuit is...
July 2017 - The new Mean Well ENC-360 360 W battery chargers suitable for motorcycle battery...
This circuit was suggested by Analog devices (www.analog.com) in its Application Note AN-411...