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.
Found in old documentation, this circuit has only the most difficult component to obtain the PUT....
This unijunction transistor circuit was found in Radio Electronics magazine from July 1968. The...
Found in a Popular Electronics from the 90s, this circuit is suitable for testing and tuning...