Guys,
This is the first time I'm using transistor in avalanche mode. I'm doing some experiment with the transistor that I have first, 2N3904. I doesn't seem to be able to get the transistor in avalanche mode.
I'm doing a simple test first by connecting 100 ohm resistor between B and E. Feed the Collector and Emitter with current-limited power supply and gradually increase the supply voltage. I've maxed out the power suply at 120 volts without damaging 2N3904. The circuit was not drawing any current. 2N3904 only has Vceo about 40 volts. I was thinking that when the power supply voltage reach above 40 volts, 2N3904 should reach the avalanche region and trip the power supply or otherwise damage but nothing happen. But when I turn off the power supply then the 2N3904 is damaged.
I think I might have mis some of the concept behind this avalanche mode.
Anyone can help give some explanation about this or suggest some simple setup to study the avalanche mode in action.
TIA,
KJ