Resistor colour codes [no longer Re: Micropolis]
ard at p850ug1.demon.co.uk
Tue Nov 20 15:42:42 CST 2007
> >> But, what is the resistor color code for negative ohms?
> > A pigment that reflects only infrared?
> Outside the 2..7 range, there is no spectral order. (Black, brown,
> grey, and white are not part of the spectrum in the usual sense.)
> Still, the idea makes some sense. But most floating-point formts are
> sign-magnitude, and I see no reason this would be different - perhaps
> the body should be a different colour?
That's what I would have suggested, except what do you do about
body-tip-spot coded -ve resistors :-) :-) :-)
Some old Tekky 'scopes have colour-coded wires for the main power supply
rails. The 2 stripes give the 2 post significant digits of the supply
voltage (it is assumed there's not a 15V and 150V supply in the same
instrument, for example), the base colour is, IIRC, white for a +ve rail
and black for a -ve one. Soe there is some precedent for changing the
background colpur for -ve resistors :-)
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