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EEVblog #299 - Retro Phone Camera Teardown

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Published on Jun 26, 2012

Teardown Tuesday.
A look at the systems engineering inside one of the worlds first mobile phone flash camera attachment, the Siemens S55.

Comments • 82

ronettreker
4:45 LED flash units are pathethic compared to xenon ones.
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Pyrodron Productions
I know how it feels to get zapped by one of those caps. 300V and it was not pleasant.
TheCrakkle
Looks like that copper shield is to stop the flash frying the memory
GetmuscleGains
good thing about old electronics super sturdy and unbreakable lol
Jack White
No, it's definitely for RF/EMP shielding from the flash tube. The copper isn't thermally connected (to the flash tube) and flash discharges produce some nasty RF/EMP.
side2sideful
Oh my God, I remember getting this along with my Siemens S45 back in 2003-2004, and being disappointed it didn't work...
CampKohler
Dave invents the single-terminal inductor! :-)
mikeselectricstuff
The spike from the trigger coil would be capacitive, so copper is fine. It would also provide some protection from fast-changing magnetic fields from the main tube discharge though eddy current losses. My guess is the main problem is the HV trigger pulse.
mikeselectricstuff
Shield will be to protect against the trigger pulse from the adjacent flash tube - this is typically 1-2kv (generated by the inductor you broke) with very fast risetime, so can couple into nearby stuff like a bastard.
onjoFilms
It would be good to do a tear down of a Battery Backup for your computer. You would be amazed at the terrible solder job on those things. I surprised they are certified. 
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