Primary emitter cluster

The primary emitter cluster was a part of the Ninth and Tenth Doctors' sonic screwdriver and the Eleventh Doctor's sonic screwdriver. On both screwdrivers, the emitter was located at the end. (PROSE:, )

The Ninth and Tenth Doctors' screwdriver had a secondary emitter cluster located inside the conical black end, and the emitter in the Eleventh Doctor's screwdriver was surrounded by the retractable casing. (PROSE: )

The Eleventh Doctor, annotating and improving a guide about Time Lords, added a section about gadgets wherein he described several parts of his sonic screwdriver, stating that the "glowy bit" was the primary emitter cluster. (PROSE: )

History

 * See Eleventh Doctor's sonic screwdriver for general information about the screwdriver.

At some point during the Eleventh Doctor's travels with Clara Oswald, he began annotating and improving a guide about Time Lords. He added a section about the gadgets inside the TARDIS, wherein he detailed the primary emitter cluster. (PROSE: )

Behind the scenes
to be added