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Old 8th January 2012, 02:21 PM   #11
GloBug is offline GloBug  Canada
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Do you have a picture of your grounding?

Page 30 of the instruction PDF shows how to ground it. http://www.audiosector.com/nigc_kit-users_guide.pdf

I have mine on a bread-board and it works flawless from that stand point. (It does pop if I turn on a florescent light. Does not bother me, easy fix if it does)

Notice I even have long leads without problems. (They will be shorter in when installed into chassis.)

I did not ground mine like the instructions, I just did it the original easy way (running individual ground to rectifier board) and it still works silently.

I will try it like the instructions in the final build.

I am also using a single transformer. It was a center-tapped version changed into dual secondaries by splitting the center tap. My transformer is only temporary, until the bigger unit arrives.

Your crackling sound seems like a bad connection somewhere. Remove those screw down terminals, re-flow your solder, check the chip for solder bridge or metal debris.

I see one channel implying a dual-mono setup, what does the other channel sound like?
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Last edited by GloBug; 8th January 2012 at 02:29 PM.
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Old 8th January 2012, 02:46 PM   #12
GloBug is offline GloBug  Canada
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You know I was just reading your other post's.

It seems you were concerned about this problem before you even ordered your power transformer.

It's almost like you predicted this was going to happen.

Maybe it's just me, somethings fishy here.
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Old 8th January 2012, 03:14 PM   #13
syklab is offline syklab  Hong Kong
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I didnot ground it to the case (no case at the moment). It is dead slient if connect one channel, hum experienced when I connected both channel to the same transformer. I like to know how to ground with two rectifier modules to only one transformer, there must be a way.
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Old 8th January 2012, 03:39 PM   #14
GloBug is offline GloBug  Canada
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Hmm, you could try changing one of the leads from the transformer around. Try moving the transformer farther away.

Also I see your running both rectifiers off of one transformer.
You might consider just using one rectifier board, after all you only have one transformer.
That might solve your problem. You might not have any benefit vs. troubles by using to rectifier boards with the one transformer.
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Old 9th January 2012, 06:14 PM   #15
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I would also suggest that the hum comes form dual rectifier boards connected to a single transformer. Use one board instead of two.
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