From: "Ken Finney"
Subject: Re: Choosing Feedback Resistors for Op Amp
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Date: Thu, 3 Oct 2002 19:46:09 GMT
"Jonathan Kirwan" wrote in message
> On Wed, 2 Oct 2002 19:14:42 +0100, John Woodgate
> >Don't EVER try to make TVs or audio products; you'll be priced out of
> >the market.
> The price points are all in the US$2000+ range, for the products. Still,
the cost algorithm seems without much merit to me. But there it is.
> >I'm not surprised that you can do digital stuff with 10 k
> >and 10 n. In fact, I don't see why you need any passives at all. My
> >'Boy's Book of Digital' just shows lots of gates; nothing else. (;-P
> The company does a lot more than "just digital." In fact, it's all analog
sensor stuff with digital support, such as DSP and micro. But you still may
see two 10k's where a 5k was wanted, or two 2k's for a 1k. Or some other
silliness. Of course, if it's a market driven feature it gets what it needs
to maintain its edge; $5 or no.
There are, of course, real reasons for such silliness. Placeing a puchase
order for a different part costs additional money, versus just increasing
the quanitity on an existing purchase order. The main reason though is
that pick and place machines have a limited number of feeders. If the
number of part types on a board exceed the number of feeders, that means two
passes through the pick and place machine, and that really adds costs. If
your pick and place machine has 35 feeders, using 36 different parts costs a
lot of money, but the difference between using 34 different parts or 35 is