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SI chips
 

offline voxRfks from Afghanistan on 2012-05-08 04:42 [#02433929]
Points: 23 Status: Lurker



so I'm going into chemistry, and was wondering, how are the
atoms arranged in a circuit board? something like a graphite
analogue?

I found this article and was wondering what kind of
practical applications it will have.
http://www.rsc.org/chemistryworld/News/2010/January/2901100
1.asp



 

offline hedphukkerr from mathbotton (United States) on 2012-05-08 07:34 [#02433936]
Points: 8833 Status: Regular



they're arranged however they want to be!

fucking fascist.

 

offline cwnt on 2012-05-08 08:08 [#02433937]
Points: 951 Status: Regular



my head just exploded

 

offline voxRfks from Afghanistan on 2012-05-08 17:39 [#02433959]
Points: 23 Status: Lurker



ok... thanks for the enthusiasm =o

 

offline dave_g from United Kingdom on 2012-05-08 21:30 [#02433978]
Points: 3372 Status: Lurker



The silicon (Si) in a chip is not pure silicon.
A lattice of silicon is made and impurities added to either
give an extra electron or remove an electron (add a
"hole").

This gives P-type (positive) and N-type (negative) silicon.
A P-N junction is a diode.
A NPN or PNP junction is a transistor.

A chip is generally just a collection of transistors.
See here for all you need to know:
http://en.wikipedia.org/wiki/P%E2%80%93n_junction

The chip has legs which are soldered to the printed circuit
board(PCB).
The legs go through the chip's plastic case. Inside the case
the silicon chip is linked to the legs using tiny gold bond
wires.
http://en.wikipedia.org/wiki/Wire_bond

The PCB itself is often made from fibreglass with copper
traces etched onto it. Typically the entire side is plated
with copper and then it is removed using chemicals (ferric
chloride) to leave the traces which are used to connect the
chips.
http://en.wikipedia.org/wiki/Printed_circuit_board

The chip legs are soldered to the PCB using solder. This
used to be a tin and lead mixture but now is often tin and
copper or similar as lead is deemed to be hazardous to
health.
http://en.wikipedia.org/wiki/ROHS

So really the only silicon on a circuit board is a tiny
amount inside the chips.
Hope that answers the question. Now let's talk about
electronic music.
This track is cool:
http://www.youtube.com/watch?v=8WYU1NRs6sw&feature=related

 

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