Re: Electronic newbie question regarding components

harley.davidson@xxxxxxxxxxxx (George C.) writes:

Do I understand correctly that even 2 identical components (same brand
and part number) can perform not quite as well as the other?

True

In such a case, what's the way to get the 'ideal' component? Just keep
buying them and testing them to see which one gives the desired
values?

Perhaps this analogy will help, but my analogies are always dangerous.

Think about a recipe that needs eggs in it. You go to the store
and there are stacks of eggs. Every carton has a size label on it.
But the eggs in every carton are slighly different, no two are
EXACTLY the same weight, down to the million'th of an ounce, even
if the eggs are in the same carton or two cartons have the same
label on them.

Fortunately, your recipe probably won't explode if you have an egg
that isn't exactly the right size, there is flexibility for a little
variation built into the recipe. But some recipes need more accuracy
than others, and you or they plan for this.

The same is true for most components. It is a very rare item that
comes only and exactly in exactly perfectly completely precise sizes.
Actually at the moment I cannot think of one that I could go buy.

So most products that are built from items are supposed to have some
built in flexibility for the variation. In fact many circuits that
are built are specifically designed knowing that there will be this
variation and thus compensate for it.

As you say, it certainly is possible to keep buying and testing
parts until you find the desired values. This is actually done
in some cases, for example where a circuit needs a pair of parts
that are as close to identical as possible. So your idea is used.
But lots of other cases it is easier or cheaper to be flexible.

Does that help?
.

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