[Crixan]

Hello,
I have limited experience when dealing with transistors and have been having difficulty with one example in particular.

I have a NTE2308 transistor that I am trying to pass 300V from the collector to the emitter but when less than 7V is used to switch the transistor at the base, nothing happens.

I have been able to switch the transistor using the same voltage at the base but using 9V across the collector to turn on a small LED, so I know that the transistor works but I can not figure out why it will not work with a higher voltage.

Both configurations are essentially the same in that I have both voltage sources coming from the positive terminal, going through the transistor, then leaving to ground.

Please let me know if you need any additional information.

Thank you.

[KISS]

Data sheet is here: http://www.nteinc.com/specs/2300to2399/pdf/nte2308.pdf

Voltages are relatively meaningless since transistors are current devices.

What is Ib? (e.g. Base resistor and voltage source)
Hfe is about 16
What's the load and supply voltage?

[Crixan]

The smallest base resistor I have been using has been 22 ohm and the voltage going to the base I have measured is at most 0.22V.

I would like to give some additional information to explain the low voltage.

I am using two 555 timers in series to generate a timed pulse that is sent to the base of the NTE2308 transistor. I am using a 9V battery as a voltage source for both timers. The 22 ohm resistor is placed between the final 555 timer output and the base of the transistor.

I believe I measured the voltage correctly, but that seems like a very small voltage.

[Crixan]

I wanted to give a quick update so this topic can be closed. I was able to figure out that I bought the wrong transistor and was able to solve my problem with another approach.

Thank you KISS for your help.

[KISS]

Thought so.