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Subject: Re: how to master electronics, use of transistor, op amp...?
References: <3DC282F0.firstname.lastname@example.org> <3DC2E327.email@example.com> <3DC3B8B8.firstname.lastname@example.org> <3DC3F6BD.D57B6172@xympatico.ca>
Date: Sat, 02 Nov 2002 23:40:56 GMT
NNTP-Posting-Date: Sat, 02 Nov 2002 18:40:56 EST
Organization: Road Runner
Joseph Legris wrote:
> Wafer wrote:
>> You see, I simply skip most of the calculations and just put
>>together something that would probably have at least fair performance,
>>then tweak the thing as needed.
> That's fine if you have the time.
> But what if you need to design a circuit before a deadline, for a
> certain cost, operating under a variety of environmental conditions, for
> assembly in a factory by people who don't know how it works (yet who
> still must test it), using parts whose characteristics vary randomly
> initially and later with age and temperature, satisfying the regulatory
> agencies for safety and EMC compliance, while integrating with existing
> devices and remaining serviceable in the field for a certain period
> without running down the batteries.
> Oh yeah, it has to fit in the housing too.
> That's some tweaking.
Oh boy, here we go again. I know you are not going to like this, but
I feel a response is appropriate, even necessary. I actually consider
all that stuff while designing things. In the example I gave of the
device with 400+ parts, it costs less than 10% of the nearest
competitor's product, does more, requires no calibration, accepts a wide
tolerance for the parts, never looses its settings even if left
unplugged, does not require battery backup, complies with all
regulations, is easier to set up and use, and does not require the
special external equipment that competing products do. Did I mention it
is less than half the size, and draws less power? It also uses all
standard off-the-shelf parts.
I don't mean to burst your little technobabble bubble, but that's
the truth. Sorry.