[sdiy] LM3900 Sub ( more info then you'd ever wanted! )

[Scott Gravenhorst]

Phil Harbison <alvitar at comcast.net> wrote:
>Scott Gravenhorst wrote:
>
>> In one of those email exchanges discussing the LM3900, someone else also
>> pointed out, and I just looked to confirm that the pinout is one of the
>> stupidest for a 4 amplifier package ever.
>
>That is indeed a strange layout. Perhaps the designer thought
>it would be useful to tie the (+) inputs of two amps together
>and therefore made those pins adjacent. I cannot think of any
>other rationale for this layout.

That _could_ be the case, but why also place outputs on adjacent pins? 
Placing the + inputs on adjacent pins could also have been done by turning
the amps around, outputs "out" and in doing so, they could have produced a
more symmetrical layout that would be visually (at least) more sensible. 
I'm more inclined to believe my sterno theory, after all, it does cause
blindness, so visual sensibility wouldn't matter.  (c;

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