Found in a magazine 73 for radio amateurs of the 90s, this circuit converts a continuous voltage and another continuous voltage, but with insulation between the circuits.
This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very...
This 2009 circuit is a bilateral call warning. Easy to build, using light communication between two...
This circuit for shunt motors was found in an American 1980s documentation. The SCR should be rated...