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 circuit with the AD8555 from Analog Devices provides a programmable voltage with a current...
We found this circuit in an English documentation from the 80's. The circuit can make use of...
This car audio amplifier was found in a Popular Electronics Hobbyist Handbook from the 1990s. The...