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Ban wrote in message ... John Jardine wrote: Diego Stutzer wrote in message m... Hi, -clip- ___ o-|___|--+--------+--------+---o 10k | | | | | | --- --- --- --- --- --- |100n |10n | 3n3 .-. .-. | | | | | | | |15k | |10k | '-' '-' | | | | o--------+--------+--------+---o created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de use fixed font to view This does exactly what you want, in the beginning the slope is less than 3dB/oct. and at 10kHz it goes to 6dB/oct. This is how to produce a pink noise that rolls off faster at the end of range, or to make some weighted filters (dBA) etc. ciao Ban [Slightly OT].These 'spread CR' things are *weird*. How else can 1Hz to 1MHz be set with just one pot!. ,-------------------+--------------. | | | .-. .-. | 2k7| | | | | | | | | | '-' '-'220 | | | | | ¦ V+ | | | |\| | ,---+---+--++---+---+--------- | ------|-\ | | | | | | | Min.-. | ---'-o .-. .-. .-. .-. .-. .-. | |-----|+/ Square wave out | | | | | | | | | | | | | | |/| | | | | | | | | | | | | Max'-'Pot V- '-' '-' '-' '-' '-' '-' | 10k | | | | | | | --- --- --- --- --- --- Comparitor --- --- --- --- --- --- | A| B| C| D| E| F| .-. '---+---+---+---+---' | |680 | | | 0V '-' A=10K:10u | B=4k7:1u 0V C=2k2:100n D=1k2:100n E=680:1n F=330:100p created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de regards john |