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A model based on thermal fluctuations in conductors in randomresistor-capacitor (R-C) networks has been shown to generate a 1/f^s noise withs in between 0 and 1, while in many real systems the noise exponent is between0 and 2. The wider range of noise exponents is shown here to be generated usinga model of random R-C networks driven by white noise current source, and havingdifferent compositions of resistors and capacitors. C-rich networks approach abrown noise, 1/f^2 response, while R-rich networks approach a white noise,1/f^0 response. Random R-C networks containing equal numbers of resistors andcapacitors generate the classic, 1/f pink noise. Thus, the composition unbiasedR-C networks produce the ubiquitous 1/f noise. Below a limiting frequency,which is a function of the size of the network, the values of individual R andC elements, and their relative numbers in the network, the power-law frequencyAC response of the network no longer holds, and the 1/f^s noise response, turnsinto either capacitor (1/f^2), or resistor (1/f^0) response, depending on thenature of the persistent conductivity structures: series R-C pathways, or pureC and R percolation pathways.

1/f^s noise from random R-C networks driven by white noise current, with low frequency characteristics changed by percolation