[Ham-Mac] pinout guide for iMac.

[David Anderson GM4JJJ]

Many thanks Mathew, that's all understood and noted!

73

David

On 27 Jan 2004, at 9:59 pm, Matthew Schiller wrote:

> As I think someone else mentioned... That chip is an i2c serial eeprom 
> (if memory serves).  It's most definitely NOT the power amp.  The 
> speaker puts out way too much humph for a power amp to not have some 
> substantial connections to power/gnd, not to mention have a heat 
> sink!.  If you do some examination of the main board you'll find the 
> power amp in with other Audio circuitry.   I believe they did this, 
> because the speaker outputs have potentially dangerous current 
> capability, plus the connector used as the potential to short the 
> speaker output to ground.  Shoot if my memory was better I'd know for 
> sure, while I didn't design the circuit I entered into the schematic 
> capture program myself!  With the i2c rom the mac can detect if the 
> proper thing is plugged in and not feed too much power to headphone, 
> for example.  (granted someone would have to be pretty silly to rig up 
> the appropriate adapter!)
>
> -- Matthew Schiller
> KD6BWE
> Previous Apple Intern (15" iMac Main Logic Board hardware team)