Found in a 90s documentation, this circuit triggers the SCR when there is an overvoltage in order to cause the fuse to blow quickly. The SCR can be a TIC106.
This active crossover filter was obtained from the component manual used. Below is the performance...
This circuit is from an 80's documentation. It makes use of two SCRs with current capacity...
This interesting idea was found in a 1983 publication and is very simple to analyze, according to the...