Did you verify that you verified that the layout is E-B-C? Or is it B-C-E? On Friday, February 8, 2019 at 9:35:14 PM UTC-3, Thomas Kummer wrote: > > My understanding is that a MPSA42 is an NPN transistor and the MPSA92 is a > PNP. My understanding of how an NPN transistor works is that when the base > “P” is turned on the circuit from collector to emitter is shorted. When the > base is off the circuit is open. I’m trying to use the decimal point on a > Nixie tube rather than an LED for the alarm. So, I have the collector > hooked to the tube the emitter hooked to the ground, and the base hooked to > 5V signal, I also have a 10K resistor between base and 5V. However, no > matter what the decimal point stays lit!! Even when the signal is off. The > only time it isn’t lit is if the base is open, if I even touch the base the > decimal point lights up!! The transistor has the the imprint A42 B331. It > appears to be a knock off and that could be where my problems are coming > from. I’ve tried looking for a datasheet, but to no avail. Any help would > be appreciated.
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