I had old PNP radios with Pos. GND.


----- Original Message ----- 
From: "RussellMc" <apptechnz@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Sunday, May 30, 2010 11:06 AM
Subject: Re: [EE] Why a lot of old equiment are positive ground?


>> why a lot of old equiment are positive ground?
>>
>> Hand held radios, etc.. etc.. I've definitely seen them with my young 
>> eyes, as
>> my memory recalls me now.
>>
>> I may be completely off, but my guess is that in the old times PNP 
>> transistors
>> were easier to source than NPN ones, perhaps due to Germanium used? Wild 
>> guess,
>> now do not attack me on my throat please. :o
>
> 1.  It's probably a 50/50 choice initially. Electrolytic protection
> arguably favors -ve ground.
>
> Space Shuttle commander and airline captains sit in the left seat. It
> took me a few decades to realise that that was because in the US cars
> are "left hand drive".
>
>
> 2. You definitely won't found out here:-)
>
> Worth watching (almost :-) ).
>
> http://www.youtube.com/watch?v=3GRm_35rHlo&feature=PlayList&p=034D577688532234&playnext=1&playnext_from=PL&index=11
>
> But you'll probably learn something about related subjects, and have
> some fun along the way. To spoil it, I'm told this is a Dave Barry
> text which has been "drolled up" as it were.
>
>
>
>
>
>
>                    Russell
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