xerxes
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Post by xerxes on Jul 21, 2006 17:08:27 GMT
Thanks Rick,
I'll have a think about what I can use to rubber mount the transformers to the case.
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rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jul 21, 2006 19:59:06 GMT
I damp the crap out of everything and one method that is fairly painless in both the pocket and to DIY is the sandwich method using dissimiliar materials. why this is usually effective is the "dissimiliar" part where rather than work together to pass along and "retune" vibrations like many so called isolation devices using solid materials the trick is to use materials that absorb and/or not comlement the vibration frequency of whatever is in actual contact with it and why cork/rubber/wood in combinations can work so well for so cheap. So Solid top wood/Firm-Semi-solid cork/Squishy dissapating middle rubber/Firm-Semi-Solid cork/Solid metal chassis no two joined products are the same so they will not work together to transmit vibrations but dissapate them harmlessly instead......at least in theory.You gotta play with this crap to get it right depending on mass and thicknesses but hey,it IS DIY and we ALL have unlimited time to screw around right ? some links to get your creative juices gooshing first read this www.hse.gov.uk/noise/soundsolutions/ss2.htmthen go shopping (for ideas to do your own ? ) www.g3m-rubber.com/CorkSanswichPads.htmwww.hardydiesel.com/acc/allacc.htm (item 6318 ) www.alltiresupply.com/p-VP-7844.htmlwww.audiotweaks.com/reviews/vibisolpads/page01.htmhell you can even carve up a car floor mat,one of those winter bitches with the ice melt grooves for the ruber parts and just layer sheet cork in between (office supply,art store) until you get the thickness right then top it all off with a pice of pine for bolting the trafos,or just use the rubber (make sure it is heat resistant ! ) or...or....or....hell you get the idea dude
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rickcr42
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Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jul 21, 2006 20:06:58 GMT
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jul 21, 2006 20:12:24 GMT
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jul 21, 2006 20:22:42 GMT
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rickcr42
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Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jul 21, 2006 22:00:47 GMT
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xerxes
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Post by xerxes on Jul 22, 2006 10:55:02 GMT
Thanks Rick, I think I have a plan. I have an old mouse mat, which has a heavy foam rubber, neoprene type backing, which I will stick to some thin plywood to make sqaure bases for the transformers to sit on. I can make some pieces to go on top of the transformer mounting tabs as well and bolt through the whole lot to the case. It should work quite well. As I saved a packet on the transformers, I splashed out on some additional 3A chassis filters. The outputs from the ISOL-8 Filter PCB will go to the transformers and the output from the transformers to the 3A chassis filters and on to the mains outlets. I'm now just waiting for all the parts to turn up. I'll take some pictures when I've cobbled it all together, I'll take some internal shots showing NAKED components for Mike as well. And let you know how it sounds, or better, doesn't.
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rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jul 22, 2006 18:41:23 GMT
should. One time when I was bored looking to just build something,anything dammit,I had this whacko idea to make a combination isolation platform/high current power supply/dock for my portable CD player andf that is what I used it being exactly the right size. Block of wood for structural integrity/sheet cork/mouse pad/sheet cork all on squishy rubber feet but when I was done it had no "mass" so I topped it off with a steel plate for weight.This was a big mistake because the plate "rang" like a bitch so I added another piece of wood to the top,added some cheap aluminum spikes POINTS UP (3) and while it looked kind of cool it was still not right so I decided to add some mass to the lid of the player. Had this solid brass ingot from my days working in a foundry (never ever ever work in a foundry !!!!!!!!!!),put it on top and it was so havy it compressed the lid preventing the CD from spnning Plan-B had this goofy little velvet pouch that something or other came in,filled it with bird shot as full as I could get it then sewed up the end and sat back to look at this nightmare and decided it was likely doing nothing good but also doing no harm and it DID look cool so I developed it over time with various mods to work as my stadard base for any portables that are playing through the big rig. My final portable CDP base ended up a steel bottom plate from the hardware store painted wrinkle black,soft rubber feet on the bottom,a mouse pad glued to the top then trimmed to the plate,a mid layer of sheet cork,another mouse pad and finally another steel plate,also painted black wrinkle (flat surfaces reflect sound,textured break it up was my thinking and yes way overkill ) and with squishy feet on top but this time in a pattern of three to support the player and all topped off with a lead shot "pillow" of just enough mass not to compress the lid and bind the CD. Does it help ? Can't say it does but it is not ugly on the shelf even when the player is travelling so is a keeper.The dedicated regulated high current power supply IS an audible upgrade though and again is not ugly.Sometimes you do a thing just to do it and that was the case here. cool The hard part of every project.I am a "I want it yesterday" type with very little patience when I want to do a thing.If I wait too long for what i need to finish I lose interest and move on the next thing which is why I have rows and rows of half finished projects that more often than not end up cannibalised for The Next Big Thing whatever that means Don't forget the pyrite
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xerxes
Been here a while!
Posts: 1,115
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Post by xerxes on Jul 26, 2006 20:03:31 GMT
Hi Rick, The transformers showed up today; I would put together the filter today, but unfortunately the case I ordered from Maplin showed up badly damaged yesterday and had to be returned for a replacement. Fingers crossed, this will show up tomorrow. It's about the third time I've ordered something from Maplin and there's been a problem. Usually it's an incorrect item, but this case looked as though it had been kicking around, and kicked around, the back of the warehouse for some time. On the plus side, they have always sent replacements fairly promptly, and without any quibbling, but going by my own experience, I reckon they screw up 1 in 3 orders, which isn't particularly impressive. In any case, I wondered if you'd quickly check my calculations for me. On the label on the top of the transformers it says: Secondary : 230v - 0.87A Which by by calculations: 230 x 0.87 = 200 watts Using your mutiply, or in this case, divide by 2.5 "safety factor" gives me a maximum of 80 watts, more than enough for any source component or pre amp I'm ever likely to want to connect to it. Does that sound about right to you?
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rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jul 30, 2006 22:44:26 GMT
sounds good to me man.can't wait to hear all the sordid details once finished
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