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Wouter van Ooijen Wouter van Ooijen The problem is after it rings a few times now it just stops working and I need to unplug it and plug it back into USB. Then it works a few times again : I might need to debug software- maybe something is wrong there. It is probably much more expensive than the 2N you are replacing if you were to buy it, but since you already have it go ahead and use it. It can support significantly more collector current than the 2N, but it still has a minimum gain of It should work fine in this role.
However, look at the pinout closely. Note the different order of C and B than the 2N You may have this transistor hooked up backwards. R1 also needs to be the right value. You say the coil draws mA. The transistor has a minimum guaranteed gain of , so that means you need to supply at least 2 mA base current, although a bit more would be good for some margin and to guarantee that the transistor is solidly in saturation when trying to turn on the coil.
If the left end of R1 is driven by a V digital signal, then there will be about 4. However, make sure the digital output can sustain 5 V when it is sourcing 4. Most digital outputs will be fine with that, but not if this is coming from a board with series resistors on the output for protection, for example.
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2SC2328A Bipolar Transistor
KSC2328A Bipolar Transistor