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|22nd March 2013, 09:04 PM||#21|
Join Date: Dec 2012
Location: SF Bay Area
Then there's another method... having a series of shunt resistors that each add 6 dB ... of attenuation. The only caveat is that they have to be turned ON in sequence "conceptually left to right"...
R0 (first series resistor) = 1000 ohms
R1 (first shunt resistor) = 1000 ohms
R2 (second shunt resis.) = 500 ohms
R3 (third shunt resistor) = 250 ohms
R4 (fourth shunt resist.) = 125 ohms
So, with no resistors shunted ... you get the 1K series resistor and the 10K load impedance resulting in an innocuous -0.8 dB drop... almost nothing. Then as each of the resistors is shunted in in turn, additional attenuation, in 6 dB steps.
Kind of what you're looking for?
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