19 Jun
2013
19 Jun
'13
5:16 p.m.
On Wed, 19 Jun 2013, Mouse wrote:
Old mil spec resistors can be even more fun and are great for confusing
people who've never seen resistors with the 5th band (% failure rate per
1000 operating hours). The first 4 bands with these are the normal first
digit, second digit, multiplier, and tolerance. I sorted out about 5 or so
1-gallon size ziplock bags of these a few months ago (full range of values
up to about 22M ohms).
Anyone else
rememenbr $\mu\mu$F (uuF) for picofarad?
It's been a while, but yes, I've seen it.
Component labeling, what fun. I internalized resistor colour codes so
long ago it's impossible for me to (eg) see yellow-violet-orange and
not read it as 47K. (Fortunately manufacturers are sane enough that
20% resistors always have space for the not-there fourth band, so it's
not ambiguous with 370K. Of course, 47K is a much more standard value
than 370K is, especially at 20%...but there probably exists a band set
that's a common value either way. Well, besides palindromic labels
like brown-black-brown.) Now if I just had some clue about capacitor colour
codes....
The ARRL handbook has a bunch of those documented. Several of us discussed
adding tables for them on Wikipedia but I don't think anyone has ever
gotten around to doing that yet.