Hello Everyone,
Many thanks for all your help and advice.
I think I will go get some BC550B and BC550C and try them both.
I like ON Semicon (Fairchild) and I can get hold of some BC550C from them.
The BC550B I can get hold of are from Taiwan Semicon (TSMC), and their datasheet says that that Emitter cutoff current is 100nA which is a lot higher than the ON Semicon ones which says only 10nA. Not sure if that matters but I will get both anyhow.
Thanks again folks for all the learnings.
Many thanks for all your help and advice.
I think I will go get some BC550B and BC550C and try them both.
I like ON Semicon (Fairchild) and I can get hold of some BC550C from them.
The BC550B I can get hold of are from Taiwan Semicon (TSMC), and their datasheet says that that Emitter cutoff current is 100nA which is a lot higher than the ON Semicon ones which says only 10nA. Not sure if that matters but I will get both anyhow.
Thanks again folks for all the learnings.
That emitter cutoff current would only matter if you plan on running them right at (or slightly above) voltage rating. You’re not really supposed to do that but sometimes people do, especially to use a high gain low noise type which is only spec’ed to be good to 50 volts.
Taiwan Semiconductor makes all sorts of generic stuff. Never had a problem with any of it. When pennies matter manufactures will choose them. I would tend to stay with the Fairchilds if noise was of paramount importance. An input stage in a power amp isn’t that critical, a mic preamp would be.
Taiwan Semiconductor makes all sorts of generic stuff. Never had a problem with any of it. When pennies matter manufactures will choose them. I would tend to stay with the Fairchilds if noise was of paramount importance. An input stage in a power amp isn’t that critical, a mic preamp would be.
