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In Reply to: Hummm - Any isolation solution for LRV connections? posted by juanstein on December 8, 2004 at 15:57:46:
The spark thing is scarey and...it may not be the only issue. The potential at ground is quite different in different places. So clearly you need to ground all components in the system to a common potential by using a bonding wire or some such device. Or... Just run all power to all components from the same plug and insulate all components from grounds which may not be of your chosing. (Ever thought about how you design the grounding in an airplane?). This will eliminate ground loops. I used to design cable systems - and learned that you can get a huge current flow just by connecting two different places in the ground.The other likely source is inductance - hum coming via the air - electromagnetic Interference. Make sure signal wires and power wires are far apart or cross at right angles. Make sure any transformers including those which might be embedded in various components are far from signal wires. I used to design digital satellite systems in which the the signal decay was like 10 -18 between satellite and receiver. Automobile distributor caps were the worst source of emi. (likely not your problem but its a fun fact.)
Electrical motors and neon lights also are great hum creators. One definitive reference for hum sources in audio is the Bellcore PDF standard, which is basically the work of dozens of Phd's over 10 years and resulted in catX and telephone wiring standards now used everywhere in the world.
Make sure that noise is not imparted from power or ground by using good balanced power of power conditioners throughout. Of course common mode rejection using balanced connections works well if you can not control the source of the emi or rfi. Radio design labs makes several little boxes that can balance unbalanced audio lines, or vice versa.
If your system is digital , its likely the problem is not in the digital domain. If there is a place where digital becomes analog make the digital lines longer and the analog lines shorter.
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- Re: Hummm - Any isolation solution for LRV connections? - tmcconnell 22:09:57 12/10/04 (0)
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