|
|
Post by andy on Dec 12, 2007 7:25:47 GMT -5
This is an attempt to reduce the hum produced by the power converters and 'wall warts' in my studio. After getting rid of my old CRT monitor the background noise from my Tele reduced greatly, but I am now aware of the hum from power units around the place. They are all in front of me when playing, so shielding the guitar will only have limited results, however, I'm starting to wonder if putting all the power units together in one place and leaning a sheet of metal over them, or metal box around them, then grounding it to the radiator will contain some of the interference? *Just in case of UK/USA confusion!* As my wife grew up in the USA with air vent heating systems , never radiators, I should clarify that by 'radiator' I mean a hot water central heating system, the whole of which should be grounded, not the front of a car!! Just in case, of course!  |
|
|
|
Post by ChrisK on Dec 12, 2007 12:10:44 GMT -5
Yeah, sure, that's what they all say.............. I tried to solve a grounding problem in Danmark back in 1980. I said to connect the RF ground to the ground in the mains outlet. There wasn't one. (I know, let's have a mains scheme that has twice the voltage and no safety ground.) So then I said, connect it to the water pipes. Oh wait, they weren't metal. So, what did we do? Yep, drove a meter-long steel rod into the ground at the power entry point (code?, I don't see no stinkin' code). While things are similar, "same" isn't universal.  Shielding is difficult, but possible. However, that's only part of the story. There is also the energy radiated by the cables coming from the power supplies and the energy conducted by these cables. A box will work, but so will screening (metal of course). Have you shielded your guitar internally? The funny thing about wall wart's is that from the perspectives of U.L. and the FCC, they are temporary connections that are to be removed shortly (description unknown) or completely (in the event of RF interference). In essence, they're code and regulatory law cop-outs (I'm not sure what a cop-out has to do with law enforcement) that we all use. And they're temporary!  Hmmm, isn't the "radiator" in a British car the forward-looking under-bonnet iron-horse water-based heat exchanger for dual-carriageways in a "round-a-bout" manner? I'm sure that there's probably a shorter (or longer) name for it. ;D |
|
|
|
Post by andy on Dec 12, 2007 15:48:57 GMT -5
Hmmm, isn't the "radiator" in a British car the forward-looking under-bonnet iron-horse water-based heat exchanger for dual-carriageways in a "round-a-bout" manner? I'm sure that there's probably a shorter (or longer) name for it. ;D Yeah, the bit that steam shoots out of when clowns cars breakdown!  On another note, can you believe that after more than ten years together, she and I still get mileage out of the 'pants' mismatch??? Just like farting, the novelty never wears off! |
|
