Re: Aaaargh, my active crossover is buzzing like a mofo

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In Reply to: Aaaargh, my active crossover is buzzing like a mofo posted by Doug Flynn on August 18, 2006 at 20:47:14:

Your crossover has many repeated active sections. If there is a fundamental problem, you can find it by wiring up just one cathode follower and seeing if that is the problem. When that proves to be quiet you will go on to loops. You could have a nasty internal ground loop or a nasty positive feedback loop.
I was solving a problem on a guitar amp that has a reverb circuit and a cathode follower that would after their own DC blocking caps would join and feed a regular input. The fix was to insert another capacitor after the two different circuits were joined. Why this needed to be the case I am still not completely sure, but it appears that the two sections were looping with the amp input.
Go in to your crossover and keep disconnecting sections until things quiet down, then add an additional section and test. This way you will find exactly where the problem appears.

Long Live Dr.Gizmo

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Topic - Aaaargh, my active crossover is buzzing like a mofo - Doug Flynn 20:47:14 08/18/06 (5)

Re: Aaaargh, my active crossover is buzzing like a mofo - EC8010 16:54:33 08/20/06 (0)

Yikes - BlackPlasticSound 09:49:01 08/20/06 (1)

Re: Aaaargh, my active crossover is buzzing like a mofo - Chris O 06:18:02 08/19/06 (0)

Re: Aaaargh, my active crossover is buzzing like a mofo - fatbottle 00:52:09 08/19/06 (0)

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Re: Aaaargh, my active crossover is buzzing like a mofo - Chris O 06:18:02 08/19/06 (0)

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