The L1 coil is formed by 4 turns of wire 20 in the form of 0.5 to 0.6 cm without core. The circuit is from an 80's documentation. The range reaches a few tens of meters.
This Motorola circuit uses only one transistor. The circuit is from 1965 documentation. The...
This circuit was found in an English publication from 1989. The integrated circuits are of the...
This circuit can be used in bridge of sensitive measures. We found it in a documentation from the...