Found on an 80's Radio Electronics, this circuit is designed to pass the 300 to 34,000 Hz voice range using standard operational amplifiers.
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...