This crowbar circuit for alternating current causes a quick fuse to blow when the load current exceeds a certain value. The circuit is from an American 80's documentation.
Found in a 1990s Popular Electronics, this circuit uses a small transformer matched to the...
This circuit uses a 455 kHz IF coil and is suitable for SSB listening on a standard receiver. It...
A Popular Electronics from the 90's suggests this circuit that is based on a low voltage...