For me, site speed of construction is the ultimate goal for prototyping circuits. This often involves perforated prototyping boards with components and wires flowing everywhere giving an impression of a clump of hair. It got the job done, however, it was increasingly difficult to troubleshoot with each additional kludge and even harder to have somebody else understand the board. Even if they had the schematics. Some time ago I was pointed to an excellent article by K7Q0 describing Manhattan Building Techniques. The style involves taking a copper clad board and gluing smaller pieces of copper clad board to it to mount components on. Techniques are discussed to make this mounts for single point connectors to more complicated dual in-line connectors. The overall result is that the circuit looks much cleaner and is easier to diagnose. A secondary benefit is that the circuit typically includes a ground plane and the possibility of power planes for reduced noise. The chief downside is that the prototype board takes longer to produce, however, this may well be justified.
( manart.pdf )
I apologize to those who are sick of seeing iPhone related news clogging the internet. As per request, order below are the scans of the two PCBs with and without the chips. It is likely that there will be a few more IC Fridays displaying iPhone chips with the hope of finding some easter eggs and then the grand finale will be my attempt at reading the 4GB flash chip. The 48 TSSOP adapter has been ordered already and with a lot of luck, sovaldi sale I may be able to use a method that involves interfacing the flash with a SD card reader. With even more luck, the chip will not be destroyed. Finally, if the planets align, it may be possible to read the contents of the chip in a meaningful way. After that, I will look for other gadgets to dissect. Files are about 3MB each.
Well, for sale sort of. The great guys at Think Secret have sent me the logic boards from their disassembled iPhone. The hope is that I apply my skills in opening up integrated circuits to get further images of the device. I will try to uncap and image the ICs, disassemble the circuit board layer by layer (tough order, might not happen) and finally read out the flash chip (even tougher order). Hopefully, more images will start coming up at Think Secret and/or here, and then there is another IC Friday coming up.
While looking up a datasheet for IC Friday, patient I happened to come across this gem, ask a manual which described the troubleshooting procedures and the circuitry inside a late 1990s Sony DVD player. The manual gives a pretty decent overview of all of the optical drive subsystems which can then sometimes be generically applied to other optical drives on the market today. Furthermore, communications are described including various error codes. Unfortunately, I did not make a note of the source website for this manual to give credit, so if you know the source, please let me know.
( sony_dvd_training_manual_118.pdf )