[quote author="frezen"]Hi again
and thanks for quick replies.
The BC560 is a PNP, why should I replace it with a NPN?
Regards
Frode[/quote]
Interesting question...
Do you also want to know why gear doesn't work when you insert batteries reversed ? :wink:
Kidding aside, for now think of it as the 'polarity' of transistors. And try to read about 'bipolar transistors', 'BJT', semiconductors in general etc.
Bye,
Peter