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Old 27th April 2011, 07:23 PM   #11
Havoxx is offline Havoxx  United States
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Join Date: Apr 2011
Originally Posted by Mooly View Post
There's no resistor added to RL which is just the speaker itself.

The grounds have to be connected so as to avoid instability and oscillation. That really means using a "star" as shown... bit of a grotty drawing lol
Lol, that little drawing actually helped a lot , I appreciate it, and I appreciate all the responses I got, it's nice to have somewhere to go to for advice
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Old 27th April 2011, 07:34 PM   #12
Mooly is offline Mooly  United Kingdom
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Join Date: Sep 2007
Your welcome.

Yes, grounding is very important and where most DIY builds fail. You can not assume that a thick piece of wire is at the same potential along its length when various items and components connect to it. So critical returns are always run separately so as to avoid this. This problem is why so many DIY amps have noise and hum/buzzes.

If you need to know more when you actually build something then just ask
Its too complex a subject to just sum up in a few words but when you understand what happens and why, then its easy to get it right.
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