Found in a Popular Electronics from the 80's, this circuit makes use of a time integrated to control a relay in a timed way. R2 determines the activation time.
In the figure we show the typical configuration of a shared line using a twisted pair where the...
This short circuit protection circuit accelerates the blown fuse in case of an output overcurrent. The...
Found in old documentation about neon lamps, this circuit shows how to add a simple blown fuse...