E)
This circuit uses a reversible double contact relay to obtain the trigger lock with the unijunction pulse. The relay must be of the sensitive type with at least 150 ohms of coil.
This circuit was found in Radio Electronics magazine from June 1961. The distance between stations is...
We found this circuit in a European publication from the 1970s. The transistors are made of...
This circuit is from a factory manual from the 80s. The circuit can be implemented with more...