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SavannahLion:
I'm not entirely sure where I need to ask this. I figure I'll check here and see if anyone knows. If not, I'll check elsewhere. Mostly it's because I'm too tired to pull up my login information for the other fourms. :P

I see symbols like this from time to time in IC schematics but never PCB schematics. I know this specific diagram is for a NAND gate but other that that, I'm mystified as to what the symbols represent. Based on the function of the NAND are these intended to be an IC version of PNP and NPN transistors?

Ed_McCarron:
FET?  Like a transistor, but the trigger is voltage rather than current?

 P type
 N type

Monmotha will be along shortly to write a 3 page dissertation on the topic. :)

lilshawn:
a MOSFET or just FET is very similar to a transistor in that it acts like a switch, but that is where the similarities end.

a FET switches on very fast and turns off very fast. therefore can be switched fast. there is almost no period of partial conductance so it is very efficient. it's often used in switching power supplies to rapidly turn the voltage off and on.

a transistor (depending on model) has a range of voltage where the transistor can be just partially on.. where it's not fully on, but it isn't quite off. a FET is either 100% (or as nearly possible) on or off.

WhereEaglesDare:

--- Quote from: lilshawn on January 04, 2011, 01:50:28 pm ---a MOSFET or just FET is very similar to a transistor in that it acts like a switch, but that is where the similarities end.

a FET switches on very fast and turns off very fast. therefore can be switched fast. there is almost no period of partial conductance so it is very efficient. it's often used in switching power supplies to rapidly turn the voltage off and on.

a transistor (depending on model) has a range of voltage where the transistor can be just partially on.. where it's not fully on, but it isn't quite off. a FET is either 100% (or as nearly possible) on or off.

--- End quote ---

...this is why they are called SemiConductors.  This is an old book from the 50s called the ABCs or Transistors...  It is a really dumbed down barney version of what transistors are and how to use them.  Anything from the 50s early 60s is really good for beginners cuz everyone was beginners then.

lilshawn:
when i took electronics class in high school, the books for the curriculum where from the 50's and 60's, all the way from brush cut military haircuts to cheezy porno looking mustache dudes and all...... it was told to us that NOTHING had changed in the last 30 years (90's at the time) and it really hasn't 60 years later.

I had to laugh about the cautionary tale at the beginning of one of the beginner books... "DON'T BE A CLOWN - sometimes there will be a class clown who will charge up a capacitor and toss it to you only for you to receive an electric shock. DON'T BE THAT CLOWN!" **spot color added JUST like in the original book**

guess what the first thing we did was :lol had the book not even mentioned it in the first place, there would have been a chance that no one would have even thought to do it.

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