This protection circuit for standing waves was found in a manual of high frequency circuits and transmitters from the 1980s. The circuit is used with transmitters.
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...