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.
This alarm, from a 1996 magazine, can be fitted with two BC548s in the original configuration...
Using only one general purpose transistor this circuit is powered by batteries. The lamp of the...
Can be used as a shield, this old American documentation circuit offers digitally selected...