A curve tracer using AC.

I posted a poor mans curve tracer which was polarlized using pulsating DC to create the trace. This one uses AC and is non-polarized.

R1 is 2.2k Ohm with a 12 VAC transformer. Here are some sample traces.

 A 2N383 Emitter to Collector. It is a negistor see the reverse break over?

  This one is a capacitor. Ideally it would be an oval but my digital scope doesn't seem to understand oval

  This one is an Emitter to Base curve.

 A 2N2222 Emitter to Collector.

 A GS109 Emitter to Collector.

 Another Emitter to Collector.

  Power diode no breakover at top.

Signal diode see the break over at the top of the curve.

A resistor.