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 uses sensors to determine who is the first to cross the end line. The circuit was...
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...
This tunable circuit was found in the May 1994 issue of Electronics Now magazine. The circuit has...