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 is based on an old Siemens integrated that can now be found very easily. It allows the...
This circuit, which operates between 7 and 30 MHz, was found in Radio Electronics from the 1980s....
Found in a 1960s RCA documentation, this circuit applies to most common triacs. The trigger device is a...