Re: End of Line Resistor - Are they a standard design?

["Robert L Bass" <robertlbass@xxxxxxxxxxx>]

> I don't think so. If you're looking for a 2K
> resistor and you find a 2.5K - 20%, it could
> be anywhere from 2K to 3K.  If it's more
> than 2.3K, you'd be out of spec for many
> systems...

Robertm is right.  However, resistor sizes are standardized and the various
values are easily had.  If you can't get exactly what you need you can also
run two or three resistors in parallel, series or a combination to obtain
virtually any value you need.

> You'd have to actually measure the resistor to see what it's value is...

Agreed again, but that's easy enough.  It looks like he's being "blagged".

(R1xR2) / (R1 + R2).

Hmm.  That works for two resistors in parallel.  For multiple resistors I've
always used:

Rn = 1/((1/R1) + (1/R2) + (1/R3) + ...))

Thus two 8-Ohm and one 4-Ohm resistors would give you 1/(.125 + .25) =
1/.375) = 2.67 Ohms.  [common speaker system problem].

Or 1000-Ohm and 1000-Ohm and 2200-Ohm = 407.4-Ohms.

--

Regards,
Robert L Bass

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