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cobra_kai

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Posts posted by cobra_kai

  4. Recording for Compression

    in Home Source Components

    Posted

    Or you could say screw apple and buy a player that actually has a microsd slot for expandable memory. You can get a 32 gig microsd card for 30-40 dollars on sale. I have 4 that I use with my clip+, which still isn't my entire collection but is everything I listen to regularly. Total cost of ~150 bucks.

  10. i'm on a roll... the kgsshv

    in Do It Yourself

    Posted

    I didn't use any conformal coating and didn't have any kind of shorting or arcing problems. I think like Horio said if the joints are neat and solder isn't all over the place you should be fine. Although if jcx were here I imagine he would not agree.

    That thread was a disaster - someone who doesn't know one end of a diode from the other, and worse yet the difference between a resistor and a diode on a layout should not be building a KGSSHV.

  13. The Headcase Stax thread

    in Headphones

    Posted

    What would you suggest then? Buy them all and return what you don't like? Hardly feasible for all but the rich. Some people can't attend meets so they are stuck.

    I don't mean to be confrontational, just genuinely curious.

    It's really not that unreasonable a suggestion. Lots of internet direct speaker companies offer 30 day trials for their stuff such as Emotiva, Salk, Ascend, Hsu, and others. Sometimes you just pay shipping and sometimes they will even foot that bill. And some of those guys, like Salk, don't move a ton of volume.

  15. The ultimate DIY? A Stax SRM-T2!

    in Do It Yourself

    Posted · Edited by cobra_kai

    Yes I was concerned about the voltage. I believe in the related thread someone said it can handle up to 3A of current though. Still kind of useless if it can't handle the voltage though, thanks for the input.

    Confirmed from the designer - it can do 2.5 amps but only 36 volts. So not even close to being useful for T2/KGSSHV transistors.

  20. Starting to really hate that other site...

    in Off Topic

    Posted

    Haha love the copyright on the darkstar schematic. You should post the information on the current limit over at the other place... some people might start crying when they find out their amp can't put 150 watts into their HE-6. Of course someone will probably ask you if you have heard a RAY SAMUELS da(o)rkstar and if not then you can't possibly know its output power. Although if they took the time to read the data sheet it is spelled out clear as day in there once you know the component values.

  24. Audeze LCD-3

    in Headphones

    Posted

    Here's my interpretation of a back emf generated by a magnetic planar speaker:

    If you consider a planar magnetic headphone, it consists of a series of permanent magnets in some fixed configuration with a membrane suspended in between the magnets. On that membrane/diaphragm are circuit traces through which the current flows. As this current changes it induces a magnetic field (see ampere's law) that interacts with the fixed magnets and causes the daiphragm to move. However, it is important to also remember the dual of ampere's law, faraday's law, which states that a change in magnetic field will induce an electric field. I believe theoretically the magnetic fields due to the fixed magnets in a planar magnetic driver is supposed to be uniform, however obviously in real life this is not going to be completely true. Therefore as the traces on the diaphragm pass through areas of varying magnetic field strength an electric field ie. a back emf.

    As to the magnitude of the back emf I don't have a clue.

  25. Linear power supply for Cambridge iD100 iPod dock?

    in Do It Yourself

    Posted · Edited by cobra_kai

    Well I was assuming 2A would be peak. But even if we use the equation on the sigma 11 site

    Tj=Ta+(P*(Rjc+Rcs+Rsa) allowing a fairly warm ambient of say 40 degrees C

    100<=40+(7*2*(3.3+.48+2))

    100<=40+(7*11.6)

    100<=121

    This is using the Bergquist isolation pad and the recommend aavid onboard sink, as well as the recommended 7V over desired regulation.

    So I guess you're right 2A continuous would be too much. But if it's more like 1A continuous and 2A peak then the junction temperature is only 80.6 which would be fine, and I seriously doubt something that specifies a 2A supply will be pulling 2A continuously. And you could always use offboard sinks for better cooling. The 7V above regulation is rather conservative as well.

    Edit: I just took a peek at the manual and under the technical specs section it states up to 12W power consumption when charging a device, so it should never be pulling more than 1A continuous.

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