This RF amplifier step has a dynamic range of 140 dB and can amplify signals from 0.5 to 40 MHz. FET is old, but modern equivalents 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...