This UHV generator circuit or ultra-high voltage was found in a 90s Electronic Engineering 90s. The triac can be of any type and the voltage depends only on the transformer.
This is a MOSFET version of a grid dip meter for frequencies between 1.8 MHz and 150 MHz,...
This amplifier was found in a 1970s documentation. Darlington transistors can be replaced for modern...
This 1968´s amplifier uses a JFET at the input to increase the impedance. Voltage gain is high,...