Found in EEE documentation, this circuit can have the duration and frequency adjusted separately. SCRs can be modern equivalent types.
This remote control receiver via the power grid appears elsewhere on this site from other sources....
May 2017 - Torex's XBP14E5UFN, an array of TVS circuit protection diodes with only 0.8 pF of...
This circuit was suggested by Electronic Engineering in a 1980s publication. The circuit makes use...