We found this circuit in the 1992 special edition of the Electronics Experimenter Handbook. The components used are still current, many admitting equivalents.
August 2017 - The new IXYS solid state relay CPC2907B from IXYS is currently in stock at Mouser...
This circuit was found in 1980s American documentation. The transducer is a piezoelectric capsule and the...
Using this circuit a low current switch can be used in the control of heavy duty loads, powered...