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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: active filters 3 poles op amps ... posted by Tre' on August 1, 2014 at 18:54:18:
I don't:) However, after reading everything I could find on the sallen key
circuit as well as John Broskie's blog on active filters it appears to me
the equal R and equal C, version can be used as an infinitely variable
crossover, with the R's being variable pots. For example, I am planing to build a low pass version that will use 10K pots as the R's and .2uF caps as the C's.
By theory, this should cover anything from around 80Hz to over 70KHz.
At the same time a Q of .5 is constant.
Of course this is only theory but it is a good place to start. I am
certainly not a SS guy, I like tubes but I guess we will see where this goes.By the way the caps can be different for a variable XO but the Q will suffer. Again I don't know why but that is what the calculators predict:)
Cal
Edits: 08/03/14
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Follow Ups
- Does anyone know why? - thermionic addictions 00:17:54 08/03/14 (3)
- RE: 2nd order low pass ... - deathtube 667 07:34:22 08/03/14 (2)
- RE: 2nd order low pass ... - Capehart 06:18:37 08/09/14 (1)
- RE: 2nd order phase graphs ... - deathtube 667 07:13:48 08/09/14 (0)
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