Hi all,
Thanks for helping me with this!
Except for RA4, which is an open collector/drain output.
What exactly is meant by this? This is the output I was using too! :|
Where PICs are concerned, you're best off having a look through Nigel's tutorials, there he explains all about things like IR and interfacing with transistors. Also, if you don't understand something there, you can ask him about it.
I will be checking out Nigels' site soon as I hear great things about it, everywhere.
There are two types of transistor buffer, there's the darling ton pair and compound pair. The darlington has the advantage of being able to use the same type of transistor but suffers from a high voltage loss. The compound pair has a lower voltage loss but requires both PNP and NPN transistors.
Using a MOSFET is the best solution since it has virtually no voltage loss and requires no drive current from the microcontroller. The only disadvantage is MOSFETs are more sensitive to static electricity than BJTs.
Ok, I have been researching MOSFETS and FETS. I Understand NPN completely - PNP - I dont know why but I can understand the difference between PNP and NPN
Is this the right idea?: NPN's need voltage of .6v on the BASE compared to the voltage on the EMITTER - when this requirement is met ELECTRON flow can go FROM the collector(+) TO the emitter (-)
Whereas PNP's turn on when there is a voltage of 0v on the base then... wait if PxP is Postive on both sides... see this is where I get confused
. Out of all my questions, I know I have alot
, an explanation of the differences between NPN and PNP would be great!
MOSFETS - Metal oxide supplementary feild effect transistors? I understand somewhat..
Depletion: Works as a semiconductor resitor when no voltage is applied to the GATE
Enhancment: is pretty much just an NPN resistor that doesnt suck current with the GATE... which is ideal for microcontroller outputs?
Hero, If you could explain the darlington pair and compound pair buffers...
Where is the voltage lost in the darlington pair?
I dont see, maybe because I dont fully understand PNPs, how, if the output of the controller is 1 (5v), the motor would turn on.. Since the base of the pNp needs a voltage of 0V to turn on? right?
Thanks again to all of you who are demystifing electronics for others and I!!
Sorry for trying to cover such a large amount of information in one thread also!
Peter Wadley