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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:
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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.

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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