One thing i miss a bit in the teardowns is some depth beyond 'taking the screws out' ...
it should be a bit more than just some pretty pictures. and pointing at a rectifier and heatsink. Try to hghilight why a specific part is chosen in a specific application and then give some background info on parts selection.
you could talk for hours on selecting something as simple as a resisitor. capacitors could take days to explain ....
If tearing down equipment where manuals are avaliable : tear down the schematic also ! highlight interesting techniques for example.
The detailed teardown with explanations of a simple supply like a E3410 could teach a lot to beginning people. It is full of clever little things. ( and we'd get out of the stage where people a re limited to lm317 power supplies becasue anything more than that confuses the heck out of them, or scare them)
Teardowns i liked : the marconi signal generator , the power supply that fried a cople of days ago , the agilent multimeter U12xx .
Teardowns with mixed feelings : the RLC meter based on two integrated circuits.. nothing to be learned from those. its a black box with zero documentation. viewers are still none the wiser on how an RLC bridge really works.
Teardowns i didn't like : the photocopier .... its just a bunch of plastic and metal with some optosensors and a massive control board of which you can learn nothing. Granted, there is the laser deflector. that's kinda cool. but only for 1 minute. its a motor with a mirror.. there is some things missing... like how the motor stays in sync with the projected data , ho the drum also needs to advance in sync to do the next line , how the rasterizer software needs to compensate for the angular distortion when projecting the image. those are the interesting bits..
I'm working on two detailed teardowns ( pictures , i'm not a very camera-guy ) of equipment with technical background information. One of em is a real RLC bridge. Agilent style ...
I guess i want to see more things like what i did in my post on the inner workings of the E3632 power supply (the trickery with analog sample hold, the dac , the measuring principle, the linear optocouplers trick , etc ) and the 34401 multimeters multislope convertor . Most people know only the comparator based converters (lm3914 style : chain of comparaotrs with voltage dividers) , or a SAR (dac with comparator) , some a sigma delta (simple principle very difficult to make) .
But slope convertors ? unknown , even though it is one of the oldest converters ( and most used convertors ) almost everyone raises eyebrows.. and when you tell them ICL7106 they all nod. yeah we have used that chip... well ... that's a slope convertor. ever read the datasheet ? (sheepischly .. no.. we only wired the display to it and use as is ... )
Those are the interesting bits. Just pointing at a chip i not really a 'learning moment'. it's still fun to watch. But you don't really learn anything from it.
Granted some 'magic' these days is deeply hidden. like the PFANG. cool to take a look inside. the only 'learning moments' would have been to reverse engineer one of the power supply blocks , highlight the usage of multi parallel ceramic caps to lower ESR and to take a peek at the analog output stage ... which sits under a metal shield.
What is going on under the big heatsink and the attached memories will remain a mystery only revealed to those that designed the chip and machine. So that's less of interest.
just my two cents.
ps. i too like to look inside stuff so don't get me wrong and don;t stop doing that.