Originally Posted by jugglindan
Sounds cool. I have decided to build one of these. It's a very simple signal injector and audio probe on a single board. Not as handy as a scope, but still useful. I just need to check some datasheets to see which transistor I can sub. I don't have any BC547s on hand. I do have some other NPN small signal transistors (S8050 and others) that should work. Maybe breadboarding and some suck it and see engineering will be faster than reading datasheets
You could substitute a BC548, BC549, or even a 2N3904 or 2N2222 (might have a different pinout though), for the BC547, and they should all work fine, since they are all NPN types.
A BC107, BC108, or BC109, should also work fine as a substitute for a BC547.
I just checked-out the link you posted and I think that's a great little bit of test gear, looks easy enough to build.
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