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META42 completed! *Picture inside*
Is that a Brown Dog adapter I see there? Was it very difficult and/or time consuming to solder the SMT part onto it? -b- ringtheorist
- Post #13
- Forum: DIY (Do-It-Yourself) Discussions
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experimenting with caps to attenuate bass in my diy phones.
I think the Blackgates should do wonderfully. Of course, they will take an eternity to break-in and one problem is that they need to stay broken in. If I recall correctly, the impedance of those ribbon transducers was awfully low.. something on the order of 2-3 ohms correct? If that's the...- ringtheorist
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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Remind me never to order from Mouser or Newark again
My two cents on the matters.. I've never had a problem with Mouser. They always ship my stuff on the same day and without fail I get it two days later. The same with Digi-key. Yesterday I actually got a package overnight even though it was shipped standard UPS ground. _That's service._...- ringtheorist
- Post #13
- Forum: DIY (Do-It-Yourself) Discussions
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6DJ8 Headphone Amp Hum
The 'internal shield' on the 6DJ8 should be grounded to provide some isoluation between each triode in the tube. As far as the hum issue goes, this has been discussed on headwize as well. I'm not sure what the resolution was -- it might just be that the optimized circuit is more prone to hum...- ringtheorist
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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Source for Lundahl transformers?
You can buy them direct from http://www.lundahl.se. Either that, or contact one of the US distributors they have listed on their website. b- ringtheorist
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Best price/performance DIY tube amp?
Kits are often the way to go if you don't feel you have the expertise to do it yourself directly from a schematic. I really like my Earmax clone amp. It cost me about $100 in parts and $15 in alcohol to build. The project is well documented and can be found at HeadWize...- ringtheorist
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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The most insane DIY project ever
...parameter in the sensitivity equation, so you get, effectively, another 3dB of SPL's for the same amount of work. Some equations: Vas = 1.4 * 10^18 * Cms * Sd^2 Sensitivity = 112.2 * 10 log (9.78 * 10^(-10) * Vas * Fs^3 / Qes) Where Cms is the mechanical compliance of the suspension...- ringtheorist
- Post #19
- Forum: DIY (Do-It-Yourself) Discussions
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The most insane DIY project ever
Avatar contest? I probably wasn't registered then. I built an MTM out of some PVC tubing but it was exceptionally bright. I decided to replace it with a tall PVC transmission line with two full range drivers in each. Once I can find more of the 40-1041 5" full range Radioshack drivers, I'll...- ringtheorist
- Post #15
- Forum: DIY (Do-It-Yourself) Discussions
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The most insane DIY project ever
Have any of you considered a dual d'Appolito in a single enclosure? I was thinking of maybe MTMWMTM, although the configuration on the actual speaker may vary. I was looking at an ubercheap 84dB/1W/1m mid. If you wired them in parallel/series pairs, then you'd get about 90dB/1W/1m from those...- ringtheorist
- Post #11
- Forum: DIY (Do-It-Yourself) Discussions
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can u use Nuvistors like in musical fidelity amps
The fact that nuvistors are so rare means it will be very difficult to get much hope at building any amps with them. Steve Bench discussed on his website some low-voltage tubes that had been used in virtual antiquity for early hearing-aid amplifiers. It's been a while since I've looked at the...- ringtheorist
- Post #13
- Forum: DIY (Do-It-Yourself) Discussions
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The specs on this amp, what do they mean??
Quote: "Quite honestly, I'm convinced that it would be a shame not to turn the unit into an autonomous preamp because it has the potential to be a giant-killer. Low-mu power triodes, running at only a tiny fraction of their maximum ratings, fed by a soft start, pi-filtered, tube-rectified...- ringtheorist
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Szekeres's Class A MOSFET amp with high imp. cans...
I don't think oil should be condemned completely. Jensen makes a bunch of paper-in-oil/copper-in-oil and other capacitors that are considered top of the line (they should be considering the cost of some..) Granted, I'm sure it's up to one's preference. I don't want to make this a separate...- ringtheorist
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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Szekeres's Class A MOSFET amp with high imp. cans...
I wouldn't say in the 470uF range that your only option is electrolytic. Your only _sane_ option is electrolytic, but there are still alternatives. Solen makes very high values of their fast caps. Even http://www.partsexpress.com holds values up to 200uF/450V. By running a couple in parallel...- ringtheorist
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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Szekeres's Class A MOSFET amp with high imp. cans...
As far as the impedence of the phones, you shouldn't have much trouble between 120 and 300 ohms. I think the biggest difference would be between, say, some 600 ohm HD-545's and some 32 ohm Grados. As for the output capacitor, its primary purpose (I would imagine) is to lower the overall...- ringtheorist
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Basics of solderless terminating?
Air-tight versus not-air-tight? :B Wouldn't a non-air-tight connection just..slip out? b- ringtheorist
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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Portable DAC prototype 2: mission accomplished
I was sort of skeptical when the whole portable DAC project started, simply because of the seeming lack of portable transports. However, it was pointed out to me that almost all portables overseas have an optical output. If you want to get ahold of such a player in the states, check out...- ringtheorist
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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WBT-0108's + Belden 89529 = worth it?
My opinion: If you're newish to this DIY thing and don't have many (if any) boutique audiophile gear, I would definitely go with the Cardas. There is probably some sonic difference between the Cardas and WBT jacks. However, for one, you need to be very skilled or else cables employing either...- ringtheorist
- Post #11
- Forum: DIY (Do-It-Yourself) Discussions
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Kumisa III
It's certainly a bunch more difficult than a cmoy, and with as many components, an etched board would come in handy. I did, however, finally decide to start building it. I have the transistors and the toroid, and the caps, resistors, etc are in the mail. I'm contemplating creating a new...- ringtheorist
- Post #7
- Forum: DIY (Do-It-Yourself) Discussions
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Kumisa III
It is on my agenda. However, I have many other projects in progress and my tube amp is doing me plenty fine for the moment. Ask aos. I know he made a layout and prototype but I don't know if he finished it. You could also ask the author b- ringtheorist
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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Portable DAC (cont. from Headwize)
I think we're getting slightly off the topic of Portable DAC's. As far as I've seen, the only manufacturer making any (affordable?) portable player with an optical output is Sony, and I've only seen these on MiniDisco (www.minidisco.com). However, my previous observation still holds I think...- ringtheorist
- Post #32
- Forum: DIY (Do-It-Yourself) Discussions
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Portable DAC (cont. from Headwize)
It occurred to me yesterday that I've only ever seen one portable cd player with an optical digital output ever. I went searching for them yesterday and again came up with only one hit. MIniDisc players also don't have digital output anymore. So.. is this project just an experiment in excess...- ringtheorist
- Post #26
- Forum: DIY (Do-It-Yourself) Discussions
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Portable DAC (cont. from Headwize)
If you need to order in quantity, double what you need and I'll take the other half. b- ringtheorist
- Post #22
- Forum: DIY (Do-It-Yourself) Discussions
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Amp based on TI's THS6012
Soldering SOIC is actually easier (to me) than soldering DIP components. It's not necessarily faster, but here's why: http://www.seattlerobotics.org/encod...6/oven_art.htm You can actually get a variant of that stuff at RadioShack. You may try that before ordering the 'real' stuff. b- ringtheorist
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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DIY input-select
Cool. Thanks a bunch. I saw the beautifully designed case by the diymania guys, but never really ventured into the depths of their sites because of the language barrier b- ringtheorist
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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DIY input-select
I'm building a balanced preamplifier similar to the one on the website of Nelson Pass. However, the input select will be switching between balanced sources. I'm not about to buy two stereo input select switches because they're awfully expensive. One of the DIY'ers building the pre-amp...- ringtheorist
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- Forum: DIY (Do-It-Yourself) Discussions