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Old 7th October 2011, 10:26 AM   #1
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Default only drum and/or bass output

hello people,
I am totally new to this field so pardon me if you find the question silly.
what i have is a 3.5mm jack, connected to two wires carrying varying voltage of a music file.
what i want - a circuit as small/compact as possible which gives me "only bass" varying voltage of the same music file.
for this, correct me if I am wrong, i need a bass equalizer IC and amplifiers.
I need very accurate results and a compact structure that's why i am using an IC for this purpose. I want to know the size of device which i would end up with. Also, suggest if you have any better idea.
Thanks in advanced.
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Old 7th October 2011, 10:33 AM   #2
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Hi anshul, it sounds to me like you want an active filter, or active crossover. If you do a search on either of those you should get some results.

Tony.
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Old 7th October 2011, 10:41 AM   #3
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thank you for replying wintermute.
can you tell me the size of a crossover? I want it to be very compact.
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Old 7th October 2011, 11:05 AM   #4
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That's a bit like asking "how long is a piece of string"

Do you want to build something yourself? Or buy something pre-built? If building yourself it should be possible to make something quite compact. If you only need the bass (ie you aren't spliting the signal into low and high) a single sallen key filter should do the trick and it will have a low component count.

Other things to consider is how sharp you need the cutoff (12db / octave per stage in a sallen key) the steeper you need the cutoff the bigger the circuit will be due to needing extra filter stages.

Tony.
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Old 7th October 2011, 01:14 PM   #5
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12 db/ octave is pretty good.
Thanks for explaining. For what I have understood, i am attaching a file, please check whether I am on the right track or not.

Anshul
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File Type: jpg file#1.jpg (45.2 KB, 28 views)
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Old 7th October 2011, 11:37 PM   #6
Enzo is offline Enzo  United States
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An electronic crossover can be just the little circuit, or it can refer to a complete piece of equipment. AS a circuit, a crossover normally would be a high pass filter and a low pass filter, built around the same crossover frequency.

In your case you want half of one - you want the low pass filter.

That tone control circuit you show is not probably the best way to do it, though it is passive. An op amp based circuit can be very compact and not to complicated.
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