[sdiy] First the Queen, now Harry...

[Ken Stone]

The LM324 is a mirror image of itself anyway. At most, all you would have
needed to do is turn it 180 degrees, and you could have still mounted it on
the correct side of the PCB :)

Ken

>
>On Tue, 22 Oct 2002, Peter Snow wrote:
>> ...One that facinated me was a circuit containing a couple of chips
>> with no markings on them at all.  Turns out that Mark had etched the
>> PCB as a mirror image of what it should have been. Instead of trashing
>> it, he simply bent the legs of the ICs upwards and soldered in the
>> chips up-side-down.
>
>  That happened to me recently. I redesigned Ken Stone's drum
>simulator circuit to use LM324s, and tried out a new toner transfer
>process that doesn't need a mirror image when I etched the board.
>Of course I had mirrored the image out of habit, and spent about
>30 sec. examining the board in total disgust before realizing
>that the LM324 is perfectly symmetrical from end to end. I then
>populated the board as usual (with pin headers on the solder side
>to retain the original pinout) and of course it worked perfectly.
>
>  Now I'm faced with a puzzling psychological quandary: if the
>board is functionally identical in mirror image, why did I choose
>to lay it out one way and not the other?
>
>-- 
>--Robert Kent
>  hanuman at ccsi.com
>
>
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au  
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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