Hi,
I have now more than 10 types of TO-92 transistors. Few of them are manufactured by world's wellknown manufacturer like FAIRCHILD, National etc. And some of them are maybe from Chinese source. I am not sure these Chinese BJT have exact chip of exact part number. So I guess these BJTs may not perform as datasheet's spec.
Now a days I am trying to play with pretty low noise audio. I am just a poor hobbyist (in knowledge & wealth) so I don't have advanced tool to measure junction noise of BJT. So is there any way to amplify just the junction noise so I can hear them? If there is any circuit then I would place every unknown source of bjt one by one and would be able to compare.
I have now more than 10 types of TO-92 transistors. Few of them are manufactured by world's wellknown manufacturer like FAIRCHILD, National etc. And some of them are maybe from Chinese source. I am not sure these Chinese BJT have exact chip of exact part number. So I guess these BJTs may not perform as datasheet's spec.
Now a days I am trying to play with pretty low noise audio. I am just a poor hobbyist (in knowledge & wealth) so I don't have advanced tool to measure junction noise of BJT. So is there any way to amplify just the junction noise so I can hear them? If there is any circuit then I would place every unknown source of bjt one by one and would be able to compare.