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 is from an old publication, from the 80s, since in modern cars this type of circuit is...
Found in an American documentation from the 90's, this circuit aims to light a neon lamp with...
This is an old 1988 circuit consisting of a timer or time control for exposing silk-screen arrays. The...