Hi,
i woule like to build an active crossover or better called: protection!
I would like to protect my speakers form the ultra low frequency!
Therefore i need an active filter -24dB at 60Hz. I would like to install this filter on the input of my power amp.
The amp has got the following specs:
10 kOhm / 47 pF
Did anyone build this?
Greetings Barossi
i woule like to build an active crossover or better called: protection!
I would like to protect my speakers form the ultra low frequency!
Therefore i need an active filter -24dB at 60Hz. I would like to install this filter on the input of my power amp.
The amp has got the following specs:
10 kOhm / 47 pF
Did anyone build this?
Greetings Barossi
Have a look at this website:
http://www.beis.de/Elektronik/Filter/Filter.html
The usual way to do what you want is to use a Sallen and Key high pass filter
http://www.beis.de/Elektronik/Filter/Filter.html
The usual way to do what you want is to use a Sallen and Key high pass filter
Why you don't try a passive line level filter (2-nd order RC)? See there:
http://www.t-linespeakers.org/tech/filters/passiveHLxo.html
only for the high-pass branch. Your specs for the power input (10 kOhm / 47 pF) are perfect. Can use highest quality caps and res, nu power supply needed, no noise, highest dinamics, simple.
Can put all the parts in the power-amp box and activate on the need with a switch.
http://www.t-linespeakers.org/tech/filters/passiveHLxo.html
only for the high-pass branch. Your specs for the power input (10 kOhm / 47 pF) are perfect. Can use highest quality caps and res, nu power supply needed, no noise, highest dinamics, simple.
Can put all the parts in the power-amp box and activate on the need with a switch.
Usually the filter is at least second order to avoid early roll off of bass. If you mean 24 dB/octave at 60 Hz, that is fourth order. As noted on teh page linked to above, passive filters have an insertion loss that may cause problems. I prefer an active solution. It is easy to build an active filter.
I have a group buy of active filter boards and power supplies that closes on August 18th. The boards offer more features than you require, but you can just leave the parts you don't use empty. A single power supply will easily handle two boards needed for a stereo high pass filter.
Filter board WIKI
Active filter on my page includes a spreadsheet to calculate values Here
PSU page here
odering page
I have a group buy of active filter boards and power supplies that closes on August 18th. The boards offer more features than you require, but you can just leave the parts you don't use empty. A single power supply will easily handle two boards needed for a stereo high pass filter.
Filter board WIKI
Active filter on my page includes a spreadsheet to calculate values Here
PSU page here
odering page
See also:
http://www.audioc.com/accessories1/misc/hipass.htm
there are some of 2-nd order, I can't find the link to the producer of them, not the seller.
http://www.audioc.com/accessories1/misc/hipass.htm
there are some of 2-nd order, I can't find the link to the producer of them, not the seller.
Or some no so cheap RLC 2-nd or 4-th order passive filter with no insertion lost:
http://www.marchandelec.com/xm46.html
http://www.marchandelec.com/xm46.html
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