30 Sep
1999
30 Sep
'99
12:01 p.m.
On Sep 30, 10:25, Mark Tapley wrote:
else +/- 20%
Subject: Re: RCA 1861, NTSC and a DEC VR-201
ethan said:
>Yellow-Purple-Gold-Gold resistor, then tied to ground via
>a Grey-Red-Black-Gold (might be Sky Blue-Red-Black-Gold) and then
through one
>of the rear pots. I would spec the values, but
I'm not used to such odd
>colors
>in the significant digits of resistors (just as tolerance bands). Would
a
>EE care to translate these? Might that second one
be 92 Ohms? Could
the
first one be
7.5 Ohms?
Puzzles me too.
Silver 1e-2
Gold 1e-1
1 Black 1e0 First 2 digits give mantissa,
2 Brown 1e1 3rd digit gives exponent,
3 Red 1e2 4th band gives quality of resistor (if present), 4 Orange 1e3 (silver = +/- 10%, gold= +/- 5%, red =
+/-
2%)
5 Yellow 1e4 5th band (if present) gives reliability
(mil-spec,
etc.)
6 Green 1e5
7 Blue 1e6 Example: red-yellow-orange-gold = 2,4,10^3, 5% =
24k Ohm, 5%
8 Violet 1e7
9 Gray (From Horowitz & Hill, The Art of Electronics, 1st
Edition
0 White pp. 645-646)
No I'm not an EE but with Horowitz and Hill *anyone* can play an EE on
TV,
so here's my guess:
Yellow-Purple-Gold-Gold : 5 8 1e-1 5% = 5.8 +/- 0.29 Ohms
Grey-Red-Black-Gold : Confederate Oil-filled resistor :-) ok, ok....
9 3 1e0 5% = 93 +/- 4.65 Ohms
Ok, if a *real* EE hasn't already appeared, please do so and set me
straight.
- Mark
Your colours are off by one :-) Black=0, white=9.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York