This circuit is from a 1969 General Electric manual. The SCR may be the TIC106. Similar circuits from other sources are found on this website.
August 2017 - Mouser Electronics has already for dispatch Microchip MIC28515 Controlled Regulators for...
This circuit was found in a 1978 English magazine. It is a configuration that aims to select the...
Found in an Electronic Design from the 90's, this circuit simulates a 100 W resistor. The power...