This circuit is from Mullard documentation from 1969. Transistors support current equivalents. Output transistors must be mounted on heat sinks.
This circuit was obtained in an 80's documentation, making use of a 3-terminal regulator of the...
August 2017 - STMicroelectronics' new T850 switches with triacs up to 8 A can be obtained from...
We found this circuit in a Japanese 1968’s documentation. The circuit makes use of transistors from...