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 can modulate a laser rate at frequencies of 50 kHz. We found the old documentation. The bipolar...
This circuit was found in the May 1984 issue of Radio Electronics magazine. It analyzes the...
This circuit can be used as a signal when powered by a car battery, as it also works with 12 V, or...