Apple /// Power Supply

[Jules Richardson]

Chuck Guzis wrote:
> On 1 Jun 2007 at 14:51, Jules Richardson wrote:
> 
>> Surely it's as much effort whether circuits repeat or not? Don't you still 
>> have to check all possible interconnects to make sure that you've got 
>> everything traced right, even if a quick visual inspection might make it 
>> appear that there's a lot of repetition?
> 
> So, you're saying that it's easier deciphering a PCB with a couple of 
> 544-conductor house-numbered BGAs on it than working through a PCB 
> with 1000 discretes?  

No - I'm saying that surely a 1000 transistor board with circuits that repeat 
is no more or less difficult than a 1000 transistor board where nothing 
repeats; the level of effort required is largely the same as it's tracing the 
interconnects which takes the bulk of the time, and that's got to be done 
fully for both boards to guarantee an accurate schematic. (All of which 
probably means that the number of PCB layers is irrelevant too - the critical 
thing is the number of solder points)

I'm not disputing that doing a 1000 transistor board is easier than something 
with BGAs on it... :-)