Hi I got the Nuforce Icon Mobile assuming it would be a decent step up from running off the jack out on my HP laptop. It wasn't the step I hoped it would be. I'm not using the amp much while on the move, but I travel a bit and need something that's easy to cary around in my laptop bag...

I've got the MS-1, they're doing a good job for rock, occasionally they may a bit fatiguing though. Anyway, I need a phone that will isolate a bit more than the MS-1. I've been looking at ATH-AD900, but it seems they don't isolate much more. The Shure SRH840 looked promising, but most...

Hi I often make resolution and transparency a top priority when buying audio equipment, and I usually end up missing some authority in the mids/bass. So now I'm looking for a bit of help for my next purchase. I really want the crystal clear "shiny" highs, but I need a bit of fun in the...

Quote: Black Shoe Axiom: There are more airplanes in the ocean than there are submarines in the sky. Since most of the people around me are Norwegian, I can't get anyone to explain "black shoe axiom" to me. I get the rest of the joke, more planes crash and sink than subs fly, but what...

Recently bought "rays and hail, 1978-81" by Magazine. The guy at the music store was about to give up on recomendations, since I already had everything he could think of. But just as I was about to leave, he ran off and dug up this album. I had never heard of them, and gave it a quick listen...

Ok, I'm still in on the MS-2 group buy, but I need to decide quickly. I know it's up to me in the end, but I'd appreciate any thoughts around this! Thing is, I've already got the MS-1's, and my funds are very low ATM. But this is a great chance to get the MS-2's. I love my MS-1's, but there...

The HD595 seems to be getting some praise around here at the moment. In Norway this headphone is like 70% the price of HD580, and priced at about $200. Try contacting a Norwegian webshop like www.hpx.no or www.datashop.no and ask if they could ship abroad without Norwegian taxes (25%), and...

I've done some easy mods to my DT231's, and I am pretty sure I currently enjoy them more than my DT250-80's. Thought I'd share it with you, as I am very sattisfied with these cans at the moment... Hopefully the feeling will last some weeks, or even months...

Just got the DT250-80's, they haven't got many hours of burn-in yet, but so far pretty sattisfied. The first thing I did was of course to open the cans and have a look inside. There were no dampening material in the enclosure, but the driver was surrounded by something that might serve as...

Topic pretty much says it all. Need a signalcable with a volume control on it, preferably a 10K ohm. "Male - male" or "male - female". The quality need not be far above average as long as the tracking issues aren't too bad. Any suggestions to where I might find this? Thanks Knut

What are the requirements for a transistor to be used for calss A biasing (cascode), like in a Pimeta? I have not measured or read the datasheet yet, but I was told the 2N5457 will handle 10mA, so that sould be ok at least. Knut

To really understand what we are building here, I would like to read more about the maths behind an amp. It will be easier to experiment with different component values if one know what will be affected. So I drew what I hope is a correct schematic over one channel of the amp section for a Cmoy...

I'm redrawing the Pimeta, and that got me wondering how the ground channel is implemented. My first guess was that the ground channel section recieves the Gnd wire from the input (pot), and the output "delivers" Gnd to the output wire. But that got me thinking, isn't Vgnd supposed to be...

I have been thinking about making a portable amp that runs from a single 1.5v AA battery. I thought about adding an amp configured to a gain of 5, giving 5*1.5v = 7.5v. What are a normal AA battery, a little below 1000mAh at best? Divide it by 5 for the gain and remove 40-50% for amp efficiency...

Have been searching around for impressions on the OPA2277 for a while without any luck. So Idecided to buy one, thought I'd share my impressions. I compared the following opamps in no particular order: OPA2132/2134: Not sure if there are any differences between these two. But if there is...

Is graduate thesis the proper term? I'm choosing my assignment within a few days. I'm studying to become a computer engineer, so all the predefined assignments are just a lot of programming with SQL. I want to do something along the lines of audio and electronics. Just create some kind of analog...

I am using the Alps (50mW Carbon Control Potentiometers, Log, 10k. RS-Components# 249-9159) for my amps. I'm listening to two different ones now. One seems to have higher level on the left channel when turned to almost maximum resistance, the other pot seems to have higher level on the right...

I'm bulilding a mint biased to class A with the JFET Cascode. I'm having trouble figuring out how the transistors are oriented, but I assume Q2 drain is connected to the OPA output, and the Q2 source is connected to the Q1 drain. Am I correct? I'm using 2N5486 transistors for both Q1 and Q2...

A while ago I built a Meier crossfeed filter which sounded thin and a bit muted. One of you spotted an error 47uF cap instead of 47nF, I changed the component but couldn't hear any differences. A week ago I decided to listen to the filter again, and it worked perfectly!?! No mute and good bass...

This is the first PCB I've ever designed, not really familiar with the program, Express PCB. Do you see any errors here? Any components too close, larger voltage leads, etc? Edit: Hope this is not 1:1 size, then it's probably too big. Thanks Knut

I've been reading a lot about crossfeed lately, so I tried to build the bass enhanced crossfeed: I seriously doubt I managed to get it to work. It sounds very thin an sharp, no bassenhancement here, not much low mids either. And I've tried plugging it in both ways I built the crossfeed...

Are the cap values important here, or are they just minimum values? Like the inputcaps in an amp. The reason I ask is to understand what the caps' role is in this circuit. Will the caps' value affect the bassbost for instance? What happens if I increase the values? I've attached my drawing...

I've just drawn the MINT to fit the horizontally leading protoboards. I do believe everything is at the right place, but I'd greatly appreciate if anyone would take a look at it and check for errors. I'll be trying different values for R8. Does the R8 have any other function than reducing...

I am planning on building some amps with buffered power supply and buffered outputs. The TLE2426CLP will not be used for the power rails due to it's temperatur sensitivity. The TLE2426ID will not be used since it's a SO14 package, and I have no plans to solder that. Could use the BUF634T, but...

I only listen to music from my mp3 player, I don't even own a decent cd player. This definately will change when I'm done with my studies, but for now I will stick to mp3 players. I am currently using a JOS MP300 (Jens of Sweden). It is quite ok, but I have not compared it to other mp3 players...