Recent content by UserNotFound
  1. UserNotFound

    SOHA + alien DAC

    Quote: Originally Posted by tomb ((15V x 0.9) x 1.414) - 1.4V = 17.69V (this assumes adequate cap smoothing, however) E=IT/C Use the current drawn from the supply (I) to estimate the voltage ripple (E, to subtract from his 17.69V figure) based on the current draw(i) and cap...
  2. UserNotFound

    JISBOS + help verifying color coding on resistors

    Quote: Originally Posted by headphonejunkie It was a military school back in the 80's. I suppose that would not go over very good nowadays.Of course, it wasn't written on a blackboard or anything like that. It was just passed by word of mouth.Let me just take back the school thing and...
  3. UserNotFound

    12 Awg Wire From Lowes Sounds Pretty Good

    Quote: Originally Posted by philodox EDIT: My amp seems to be immune to any of this for what it is worth. Sounds the same straight out of the wall as it does out of my power conditioner. I am so happy with how it sounds that I haven't bothered trying any other power cords, but I may do...
  4. UserNotFound

    12 Awg Wire From Lowes Sounds Pretty Good

    Quote: Originally Posted by philodox Sorry, but it is common knowledge that switching power supplies feed noise back on to power lines. Do you really need me to explain that to you? Why did you choose to use a switching power supply? Using a different power cable seems to be the...
  5. UserNotFound

    Official Perfboards and P2P Thread.

    Quote: Originally Posted by TzeYang Fancy F'ing Solder Pic We cannot be friends
  6. UserNotFound

    12 Awg Wire From Lowes Sounds Pretty Good

    Quote: Originally Posted by philodox Sure do, what would you like to know? Well, for starters you could throw some ideas out there on how noise on the power supply makes it's way from the mains line to your headphones. I mean after all, there's a ~110V 60Hz "sine" wave going in...
  7. UserNotFound

    audiophile diy DAP?

    I'd just like to throw in my two cents that if we're talking ARM architecture and BGA's, the Y in DIY means "YOURSELF". You're not gonna find a lot of existing designs and discussion to help you. It's really gonna be a project from scratch. I just did a quick and dirty project with an...
  8. UserNotFound

    Adding an aux input to a cheapo cd player

    Not knowing anything about your particular unit, I'd suggest unplugging it, taking it apart and finding the source switch (FM/AM/TAPE/CD/OFF). See if there are twice as many leads going to the switch as options. This would indicate L/R signals for each, at which point you could use an ohmmeter...
  9. UserNotFound

    Official Perfboards and P2P Thread.

    Post a pic of the underside of that first board! That's where we see your real work. Any schmuck can put parts on a board, how the connections are routed is another story Everything in my signature is on perf boards at the moment, it takes up about .66 cubic feet of space with all the...
  10. UserNotFound

    Why do/don't "audiophile" cables improve sound?

    For those of you debating the use of tube equipement in recording, I direct you to the Journal of the Audio Engineering Society, May 1973 Volume 23 number 24 : "Tubes Versus Transistors--Is There an Audible Difference?". The abstract: "Engineers and musicians have long debated the question...
  11. UserNotFound

    What Piece of Gear did You Blow Up Lately?

    Quote: Originally Posted by joneeboi I remember hearing a story of a guy salvaging computers in a dumpster who got severely shocked by capacitors sitting in one of the computers that [was] over 10 years old. In class, they told us to discharge any caps with a resistor before working...
  12. UserNotFound

    What attenuator impedance do I shoot for?

    You could go into the depth to measure the output impedance of your source, and input impedance of your amp, and create a divider network to achieve the desired attenuation while maintaining efficiency for both parts, but that's 2nd to 3rd year engineering work. I would personally use a...
  13. UserNotFound

    12 Awg Wire From Lowes Sounds Pretty Good

    I'm interested if the people who improve their sound with fancy power cables understand how the power supply in their device ACTUALLY works?
  14. UserNotFound

    help:how to solder and desolder soic package ic?

    Quote: Originally Posted by holland A heat gun is another, but I've only heard about this and never used it. This is by far the easiest way to remove parts from a board. Sometimes you may need a board heater if it has a large groundplane connected to the part, though. And with...
  15. UserNotFound

    has anyone experimented using a power opamp like LM3886 as a power supply...

    The data sheet says 3V on the plus supply, sounds like you're doing well. I need an OPA548, where did you find yours?
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