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.
Very strong audio spikes in a headset can damage the ear. This circuit, from a 90s Popular...
This circuit is suggested by National Semiconductor and can serve as a basis for an excellent...
This circuit allows 220 / 240V shavers to be used in the 110V network. The diodes can be general...