This circuit with unijunction transistors was found in a documentation from the 80's. The trigger times of the SCRs depend on the capacitors and are adjusted in the 5M (4M7) potentiometers.
We found this TTL power supply circuit in the December 1972 issue of Radio Electronics magazine. The...
This dimmer for the 120 V (117 V) network was found in the magazine Electronics Now of August...
This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V...