Curve tracer christmas calendar 4 – DIAC Todays trace is a DIAC or trigger diode. Notice the retracing of the curve, its a artifact of the curve tracer. Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Like Loading... Author: Thomas S. Knutsen Electronics engineer with interests in RF and analog electronics. View all posts by Thomas S. Knutsen