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 came out in a publication called Electronics Handbook of 1993. The circuit triggers an...
This circuit detects the 60 Hz signal from the power grid captured by an object, activating a...
This circuit shows how to use a fixed 5 V regulator on a variable 1 A source. The integrated...