Circuits similar to this can be found in this section. This is from 1967 General Electric documentation. The main SCR must be fitted with a heat sink.
This ultra-low noise amplifier and simple power supply was found in Analog Devices documentation from the...
This circuit was found in a 1970s documentation. The integrated circuit used is uncommon today....
This control was obtained in an old publication from 1985 and uses a triac, which today can be of...