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Old 17th June 2007, 07:03 PM   #1
skogs is offline skogs  Norway
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Default Active highpass filter - ground

Hi. im making an active highpassfilter for my subwoofer, and i just wondered wether i should connect the ground (or negative pole?) from the source (main amp) via the filter on its way to the sub-amp, or not?

here's the filter: http://www.sound.westhost.com/project99.htm
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Old 19th June 2007, 05:07 PM   #2
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The ground has to be connected through the filter.

By the way, you should not use TL072 opamps.
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Old 19th June 2007, 05:50 PM   #3
Did it Himself
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If the subsonic filter is housed in it's own box no special grounding precautions should be needed, other than general good grounding principles. Additional ground straps should not be needed.

Quote:
Originally posted by Keruskerfuerst
By the way, you should not use TL072 opamps.
Nonsense. Those op-amps are fine and I have used loads of them myself without an issue.
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Old 19th June 2007, 06:25 PM   #4
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In my experience you should use something like BB OPA134PA, BB OPA627, LM 4562, AD825 or AD 8065/8066.
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