This circuit was obtained in an American publication of 1970, making use of components of the time. Components may be replaced by equivalents.
This circuit of a documentation on very old oscilloscopes uses the first commercial transistor of...
This circuit was found in an application note of the LTC1164 from Linear Technology of the 1990s....
September 2017 - Can be purchased from Mouser Electronics Triacs with 20 A and 30 A currents...