Having been inspired by casainho's bluetooth-enabled scale (http://code.google.com/p/casainho-projects/wiki/SdCardBathroomScale
) I'd thought I would have a go at my own cheapo digital scale. However I've been having some problems identifying the components on the board. I'm guessing that the microprocessor is hidden underneath the black blob and that the 8 pin IC marked ISSI 546 406-26DL is an EEPROM. The real question is, what is the 14 pin IC marked AA|324 503BN (the logo is a swirly A)? Is it the op-amp? And in that case where can I find the datasheet for it? Can I assume that it is pin-compatible with an LM324?
Also I'm curious about the flat metal disc on the reverse side of the board, what is it exactly?
Thanks for your help!