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Old 27th August 2003, 02:07 AM   #1
biff584 is offline biff584  United States
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Default ground loop breaker

I built a P3A amp and was having problems with ground loops, so between the amp's signal and power grounds and the earth ground I place a loop breaker consisting of two diodes in parallel in opposite directions and a 10 ohm resistor. This greatly reduced the ground loop, but I can still hear it- are there any other adaptions I can make to further reduce the effects? I was thinking about upping the size of the resistor, removing the resistor, or maybe even trying to add a simple RC low-pass filter designed to reject frequencies at and above 60Hz between the signal and earth grounds.

Thanks alot.

Brian.
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Old 27th August 2003, 11:15 AM   #2
trwh is offline trwh  United Kingdom
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Hi

You could try increasing the value of the resistor - although I wouldn't leave it out altogether. In one design I saw a 100 ohm part used; as long as you keep the diodes any value is safe to try. Many designs also use a 100nF mains rated capacitor in parallel with the other components to bypass the resistor at high frequencies.

Hope this helps,
Tim.
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Old 27th August 2003, 12:03 PM   #3
biff584 is offline biff584  United States
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Thanks, I'll give that a shot and try a 100 ohm resistor instead and see if it help much.

Brian.
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Old 27th August 2003, 12:20 PM   #4
ukram is offline ukram  Finland
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Try reading Jensen application notes.

http://www.jensen-transformers.com/apps_wp.html

You should show us a picture with the ground connections of your whole system...
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