Hello everyone. I'd like some help with a small problem. I just learnt how to use PNP transistors only a few days ago, and so far, the only building Ive done involving a PNP was turning on an LED (switching), just to familiarise myself with the basic concept. It occured to me that the only difference between the PNP and NPN as regards switching, is the NPN's base sinks current (conventional flow) while the PNP's base sources current. Basically, the PNP is turned on by powering it's base, while the PNP is turned on by grounging its base, right? I came across this current boosting cicuit, and was wondering if its possible to replace the transistor with an NPN. Could anyone please help me understand why a PNP was used in the first place?
Here's the link to the full website: http://www.eleccircuit.com/boosting-regulator-current-for-ic-78xx-by-mj2955/
Thanks a lot for your time. Have yourself a nice day.
Thanks a lot for your time. Have yourself a nice day.