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.
This circuit, with a 12 V input, was found in a Popular Electronics from the 1990s. Information is given...
This circuit is the equivalent of the CB121, but is triggered with the negative transition of the...
We found this circuit of a clamp-type ammeter in a Japanese documentation from the 1960s. The...