On Sep 30, 10:25, Mark Tapley wrote:
> 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),
else +/- 20%
> 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
Received on Thu Sep 30 1999 - 19:01:38 BST