Quote: When folks do stuff like copy and post the circuit for the RA-1 that does nothing top help our end of the hobby one bit. Actually, the RA-1 design was practically common knowledge to DIY ever since the DIY boards at headwize were started about 5 years ago. Since there are few...

"Detail" is a subjective term that's hard to relate directly to the performance of a specific component- a lack of detail could be caused by distortion, poor high frequency response, or compressed dynamics, which could be solved by improving the amplifier. Anything that makes the output signal...

Quote: Is there something about the setup you’re suggesting that would keep it from being portable to this degree? Nope, not at all- But when i mean portable, i'm speaking from my own experience, usually using it on the bus or jogging- in that case, i want the whole system to be small...

Quote: This alone proves that it’s not an either/or choice. It IS NOT just a choice between convenience and sound quality, or it didn’t used to be. There used to be a spectrum of choices. There is choice- get a good modern player like D-ej2000 or an iriver IHP, and add a headphone...

The D-ej01 does have a terrible headphone out, but it also has a very warm, smooth line-out- one of the best of any player i've used (not very many)... Even Keven Gilmore used a D-ej01 with his portable STAX setup.... So if you're using an amp, its one of the best players- not very many...

Disclaimer- I've never actually seen a set of electrostatic headphones in my life, so my description might not be completely accurate... I don't think your descriptions of the cables is correct, AFAIK there's no way to send power on one set of wires and a signal on the other, and combine...

First off, G-protection does not use compression, though many of the older "classics" with 40 second buffers did use compresion I have a 5 year old Sony D-ej01, the first with G-protection. It uses a 16 mbit DRAM chip for the antiskip buffer, and gives about 11 seconds between physically...

http://www.nytimes.com/2004/01/17/sc...partner=GOOGLE

I just found out that the professor for my analog electronics course (just started this week), Dr. Lloyd Pepperd, is the owner/designer of the Mapletree line of amplifiers... As a professior of solid state electronics at one of canada's major research universities (Queen's), he is an expert...

Quote: Thomas, That is a part of doppler effect. This moving boundary changes the effective path of sound in the frame of reference of the audience. However, what you suggest is very difficult to do. And you can achieve the same effect by moving transducer in the air. (no need for...

Quote: You're right, it doesn't. I was just quoting the explanation I got on the web, will have to look into it later, when I get back. moral of the story, don't listen to chemists trying to explain physics My post above appears to be a valid proof that frequency does not change...

Ok, i've figured out a way for all this to work.... First, the frequency does not change when passing from argon to air- here's a "thought experiment" that proves it- send two pulses from a speaker, exactly five seconds apart, in a normal room.... They will arrive at your ears some time...

Quote: thomas - Wavelength and frequency are directly related... Wavelength = 1/f see peterR's post.... i think you mixed up the equation for perod and wavelength, period=1/f.... Quote: The reason helium works is it's lighter, so your vocal cords travel at a faster...

(sorry, i was late to this thread so i'm not sure exactly how your project works.... If it creates sound based on resonance like wodgy describes, then it may work, but if it uses the gas to change the frequency of the sound directly, i don't think it will work) Quote: Actually, this is...

Keep in mind that SMD stations are much more useful for circuit rework/repair than assembly, and are useless for through hole audio circuits (ie any of the projects you'll see here). The ocassional SMD part you'll run into will be much easier to solder with a good temp controlled iron with a...

Quote: Reviews? It's radiohead! Pfft. Don't need no stinkin' reviews I meant comparasons between the packaging of the two versions Since i already have the music, don't need to run out grab the CD on the first day like past releases..... I've had the original unmastered version...

Quote: is that a link for amazon.com, or amazon.ca? might be a good idea to get one for amazon.ca, given all the canadians around here. The cheapest price i've seen for the special edition ishere , $18.50 + $2 shipping (cdn) Might actually be cheaper for Americans as well, but maybe...

grinch- yeah, that was basically what i was describing, (i suck at explaining things) but some crossfeed between channels might make it work better, since when you're listening to speakers, there is some mixing between channels.. Again, i'm not sure about time delays, I haven't looked at this...

I don't think there's very much chance of DIY'selfing an entirely electrical circuit that can create the surround sound effect. (ie without using 4 channel headphones). Dolby headphone chips are made by several manufacturers BUT its basically impossible to get them if you're not a large...

I experimented with surround sound headphones a while back- I think an entirely electrical system is impossible for DIY, but a combination electrical and acoustic system might work: Take a look at this, from the headwize library: http://headwize2.powerpill.org/proje...onnors_prj.htm...

Quote: I stand corrected. Actually, i realized my reply was partially wrong, the chart AOS linked to was what i meant to say... The resistance of a diode shoud be infinate at low voltages and very close to zero at high voltages like you said, (rather than reaching a constant as a...

An LED doesn't have zero resistance, so you don't have to worry about it shorting out your batteries. You can't measure the resistance of a diode directly since its non linear at the low voltages used by a multimeter. However, you can see that an LED is releasing light energy, and that energy...

Quote: Probably the most challenging pieces I've performed in recital are Liszt's Vallée d'Obermann and the Chopin Nocturne in Fm, Op. 44, and those really pushed my abilities. Hey, Do you mean Op 48 no 2 in f# minor , or Op 55 no 1 in f minor? I just started learning 48 no 2...

Quote: Thomas, I respond to rash generalizations. I'm guessing you don't know and don't care about the configuration of the META42 you listened to, which makes your statement meaningless. What i posted is my opinion, not "rash generalizations". Just because you have a different one...

http://www.riaa.org/PR_story.cfm?id=600