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.
Two inverters, of the 6 available in a Low-power Schottky 74LS04, are used in this anti-ring...
The purpose of this circuit is to alternately activate a two-tone horn with low sound and a horn...
This circuit was obtained in an old French publication from the 80s. The maximum power of the lamp...