This circuit with SCR is from a Radio Electronics magazine from September 1965. It is a commercial control from Heathkit for controlling universal motors.
This 5 V x 8 A power supply was found in Siliconix documentation. The unit operates with a 24 to...
This circuit with the operational amplifier CA3130 was found in a documentation from 1977. The...
This circuit is based on the well-known digital module ICL7107 feeding 4 displays with...