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 indicator makes use of an LM339 voltage comparator circuit that contains 4 internal...
This 3-channel sequential circuit, but which can be expanded further, uses triacs to drive...
This soft starter dimmer was found in a 1980s documentation. We can implement it with current...