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#1 |
diyAudio Member
Join Date: Oct 2004
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Yes, I had audio hum resulting from the coax cable's ground, and resolved it with an Iso-Max VRD-1FF -- inline to the cable box.
Hum is 95% gone.....that's acceptable for me. HOW DO I MAKE something similar ? Is it just inline caps ? Why can't I find any DIY ideas for this ?.....(besides the common back-to-back 75/300 ohm antenna transformers.) =FB= |
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#2 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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Hi,
the hum buster may be an audio transformer to provide isolation between the equipment.
__________________
regards Andrew T. |
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#3 |
diyAudio Member
Join Date: Jan 2007
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the so called antenna isolation transformers sold here rely on capacitor coupling.
No transformer inside the tranformers... ![]() |
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#4 |
diyAudio Member
Join Date: Oct 2004
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I still don't understand why there isn't an easy diy solution ?
If they're caps, what values ? Those Jensen isolators have a stated frequency that they filter/isolate, which I guess is crucial, so as not to degrade the video signal. I believe they use caps too. Many of us use ground isolation in our audio projects including me. (10ohm resistor, and 100nf cap between earth and circuit) =FB= |
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#5 |
diyAudio Member
Join Date: Jan 2007
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of course you can DIY. The absence of a dedicated internet site doesn't mean one can't do it.
![]() Choose a 100pF or larger ceramic for the inner conductor and something in the nF range for the shield. regards |
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#6 | |
diyAudio Member
Join Date: Mar 2006
Location: Michigan
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