Jan-Erik Soderholm wrote:
> And, if a design uses *both* 270 ohms (an E12 value) and
> 300 ohms (an E24 only value) in the same design, I'd expect that
> there is a specific reason to do so.

Not necessarily in this case.  This discussion is the first I heard of "E"
series designations for resistors.  I had always considered the standard 1/4
watt 5% resistor series to be universally available.  From the link you
sent, that would be the E24 series.  I used values from that series without
any consideration about whether they would be available in a sparser series.

5% 1/4 watt resistors are the base line in most catalogs.  All places that I
know of that sell these resistors sell all the E24 values.  Since any of
these values are available for $.99 per bag of 100 from Jameco, I didn't
think that would be a problem.

Doesn't Jameco (http://www.jameco.com) ship outside the US?  Resistors are
small and light weight, so the extra shipping shouldn't be much especially
if you buy a few other things (like the ZIF socket).  That's why I included
Jameco part numbers on the bill of materials for any non-generic parts.

If someone really wants to splurge, they can get 100 of all the 1/4 watt 5%
values from 2.2 ohms to 10Mohms for $120.  That should fix the problem for a
long time and facilitate general hobby projects.

I just checked, and the two 300 ohm resistors (R21, R22) are used in voltage
dividers that effect the target chip Vdd values.  I do not recommend
substituting a different value.


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