RCA 1861, NTSC and a DEC VR-201

From: Mark Tapley <mtapley_at_swri.edu>
Date: Thu Sep 30 10:25:00 1999

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
Received on Thu Sep 30 1999 - 10:25:00 BST