I need to get my headphones repaired. They are the CD3000 and are a bit old. The cable has become loose causing the sound to go in and out. Also, the ear pads are disintegrating. I don't know if there are any more ear pads around. These cans have been discontinued. Will Sony be able to fix...

Something still doesn't seem right. I removed the class A components. The amp was still drawing a lot of power without any source. I unplugged the opamps and there was still a significant draw. Removing the buffers brought the current down to just under 5 ma which is for the LED. Should the...

Yes, briefly. And, it did not do it. I think I've found the problem or at least part of it. I hate to admit it but I put 2 of the caps in backwards -doh! The current draw is still the same but going down slowly along with the batteries. Does the current seem right for a class A pimeta? My...

I think I used wrong values when calculating quiescent current. opa627 should be 7ma, buf634 should be less than 8 when using 220 ohm - stacked 2 deep around 5ma each, plus 2 for the LED. This means I should be at 53ma. Do these numbers sound right? Switching to 8610s dropped the current 10ma...

I should mention that I'm using 3 627s with 2 9v batteries. It sounds good to me when there is no hum - which it has decided not to do for a while. I read other people suggesting 3 or 4 9v. I did use sockets and have 3 8610s as backup. Is this combo doomed? Or just use easier to drive...

actually the rio karma problem was the backlight. I checked the hard drive access and the backlight of the iAudio X5 - they are not causing it. It seems random. I have to put some tape or something on my tests leads so I can stop the player - I'll have to get some leads with clips....or grow...

You might be right about the hard disk noise - I used to have a rio karma and I could hear the hard drive with my shures. Assuming it's just noise from the DAP, what can I do to reduce this effect? Other than replacing the DAP.

If I measured correctly, the dc offset is .1 to .2mv. With the source on plus with.without headphones, I measure left to ground and right to ground at the headphone jack

no input caps. the buzz/hum is through the headphones. didn't check the dc offset yet. c6 is 10pF 100V

It does seem to jump (it fluctuates) about 2 or 3 ma, about 78 to 81ma. I am using 3 OPA627s and 6 buffers. Also, if I wait after stopping the music, it will stop after about 10 sec. My current draw seems to be within reason: opa627 - 11.7-16, 14 typical buf634 - 8? LED 2 should be at least...

Another conflict I noticed: "The simplest path is to just use the values given on the schematic" "As a rough rule of thumb, make R3 five to ten times lower than R5" schematic shows R3=1k and r5=3.32k

Also, using 1M for R2. Tangent states the R2 should be 10x volume. But schematic shows 50k volume with 1M R2. I'll poke around some more and let you guys know how I do - I'm sure somebody else will/has encountered this problem.

Another strange thing: This only happens with my Senn 650s(300 ohm) and not my Sony CD3000(32 ohm). I thought that if R6 was introducing noise that the CD3000 would be more susceptible.

More info: The buzz does not change with the volume. The sound continues when the music is stopped. The sound stops when the dap is disconnected from the amp. Also, I am using 1M for R6. Tangent mentions that using above 1M in the multiloop can introduce noise. Should I put something around...

I just finished my 1st PIMETA and it sounds good except under certain circumstances. After I connect my DAP(iAudio x5L) for a while, I hear a high pitched buzz. It takes about 5 sec and goes away turning it off then on again. However, this does not happen when I connect it to my cdp (Rotel). Any...

There are many electronic shops but they don't always state what they really sell. I get like best buy and lighting electronics, etc. I did find an Allied Electronics in Chadds Ford, PA. There is another place called Cooper Electric Supply that is much closer but I'm not sure exactly what they...

I am short a couple of cheap resistors in my current project [pimeta]. But, the only local store that I know that has parts is Radio Shack. They are ok but they have a limited selection and seem way overpriced. Does anyone know how I can find a local store that sells small parts? I live in...

That's the kind of stuff I was looking for, thanks.

Is there anywhere else I can buy printed circuit boards individually other than from Tangent. I'm want to find other projects are available that won't require a breadboard or making my own circuit board. I saw expressPCB which you can buy 3 for $51 but wanted more projects similar to the ones...

Mouser and Digikey are my top choices. Mouser has much faster shipping. But, they don't always carry everything I need in stock. Often I have to split my order up. I also occasionally order from hmc electronics. Although I sometimes get things from Radio Shack, I don't recommend them. They are...

I am going to order some stuff I need and want to get something to clean my work. I've never used anything before - I just leave it on there. But I've had to fix some commercial electronics (receiver, dvd) and the stickiness annoys me. So, which stuff do you guys recommend? I use Cardas quad...

I have the x5l and it wasn't much more money. I am very glad I got the L version; the battery lasts a long time.

I had a karma and it was awesome...until it died. Sound quality is great. It's been almost a year and I still have not found a replacement that rivals it. I might get an X5. If you don't have any fear of it dying and 20GB is enough, go for it. I considered getting another one but couldn't...

I am looking for a smaller armband for the U2. Has anyone found anything better than iAudio's armband. Their's seems a little big for the player...and stiff.

I've been wanting one of these. But, I needed something and got an iAudio U2. I like it but it has a weak headphone out - 13mw / channel @ 16 ohm. That's fine for its size. But...The X5 is has the same specs for the headphone output which I think is ridiculous. I had a karma which went to dap...