This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time, but a modern transistor of equivalent power can be used.
Texas Instruments UCC21225A is available from Mouser Electronics. It is an isolated gate driver...
This audio stage can be used in siren circuits, sound effects and others to excite a few watts...
This circuit with JFET and Unijunction was found in an ancient American documentation. The...