AVR-Chat

>   "R" is the color red, so what is the 100 supposed to indicate? I've
> never before seen color used in a circuit description. There is no
> common electrical unit I am aware of that is designated by an "R" in
> that manner.  Is this more of your view of "being practical?"

The link that Peter posted
<http://www.lalena.com/audio/electronics/color/> explains the use of R
quite well. The suffix M means x 10 to the power 6. The suffix K means
x 10 to the power 3, and the suffix R means x 10 to the power zero.

So, 100K means 100,000 ohms. 100R means 100 ohms.

The R is often used in place of a decimal point, since the decimal
point is so hard to see, especially on small surface mount devices.

6R8 means 6.8 ohms.

With surface mount devices (at least the ones I've seen), they use the
R and not the K or M. So 10K would be written as 103.

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/