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  1. DaKi][er

    Desktop computer PSU specs; possible to DIY?

    Quote:   No, there is no regulator from 12V to 3.3V, Computers never use linear regulators for anything either (some soundcards and low power devices may, but they are exceptions). As has been said, 3.3V is used for some peripherals, but it's not used for high powered devices like the CPU...
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  3. DaKi][er

    Desktop computer PSU specs; possible to DIY?

    Quote:     It is more efficient, in a nut shell. The drop doesn't matter at all for SMPS's, they have very good efficiencies where it is usually more efficient to run from higher voltage inputs. The wire connecting your PSU to the board don't need to be as heavy either, as there is less...
  4. DaKi][er

    Balanced headphone amp with DAC, Community project perhaps?

    PCM2706 -> PCM1794 -> i/v converter -> 4channels of your favourite headphone amp   Read the datasheets of the parts I linked, start playing with a PCB layout editor, spend a few months playing with designs, look and research other peoples designs, and by the end you'll have something that'll...
  5. DaKi][er

    Show me your desk!

      This pic is a bit old, that stack is a bit larger now with another small bench power supply, another matching DVM (2nd from the bottom), another DSO and a PC.   I don't have much suggestion on organisation, I use lots of boxes to put parts/projects in progress in so you can swap them out...
  6. DaKi][er

    soundcard clock modding to improve S/PDIF jitter?

    Quote: Originally Posted by ericj Your assumptions here are total nonsense. PLL clock synthesis has been the norm for 20+ years. They really can get 44.1khz spot on using a reference crystal that is not precisely divisible by 44.1khz. 'course, I think all clock upgraders (in...
  7. DaKi][er

    soundcard clock modding to improve S/PDIF jitter?

    Sorry, but that was the receiver side actually. The CS841x chips that are used as spdif receivers have differential inputs and this circuit converts the incoming spdif to a differential signal which is suppose to help. No, that transformer can't be used for analogue, it is designed to work...
  8. DaKi][er

    soundcard clock modding to improve S/PDIF jitter?

    Nearly all the time, none of the gear you buy actually does proper coax transmission and termination. You can't compare coax to toslink until you have the coax right, so for the best results you have to make the rx/tx circuits yourself For transmission you want the schematic posted by Jocko...
  9. DaKi][er

    soundcard clock modding to improve S/PDIF jitter?

    On crystals and jitter - • View topic - What do you guys think about these?
  10. DaKi][er

    soundcard clock modding to improve S/PDIF jitter?

    Toslink is worse off than coax, so there is no point in upgrading your clock if you are going to shove it down some crappy plastic 14.18318Mhz isn't an integer ratio of any of the audio sample rates, so there has to be some stuff going on to make it to the same rate and that is going to...
  11. DaKi][er

    figuring out an unknown transfomer

    Quote: Originally Posted by nightanole So i inherited a huge transformer from an amp. the problem is i have no idea on how to ohm it out to find primaries and secondaries. It just has 5 wires coming out of it. I assume that means 1 set of secondaries with a center tap? That is...
  12. DaKi][er

    Melbourne DIYer Help

    If it wasn't that far out of my way and I had the spare time, I'm in the eastern suburbs and working long hours currently
  13. DaKi][er

    SMD Soldering

    Quote: Originally Posted by CodeToad Yeah, I've figured that out. I just can't see how having little solder dinkelberries blowing out around the board is a good thing. I spend more time cleaning that crap up than it's worth. It sure is a must have for desoldering chips though...
  14. DaKi][er

    SMD Soldering

    The only thing you need a hot air station for is general desoldering of smd's and soldering on BGA parts. If you are soldering by hand then just use an iron and regular solder and plenty of flux. The mini3 only has 2 SOIC's and they are absolutely massive in the SMD realm, you should have no...
  15. DaKi][er

    Voltage Dividers...

    This is the sort of problem that is good to solve from first principals, get yourself some paper and use ohms law, V = IR, to work it out yourself from scratch, make up some values. You can go further by adding a load to the output and seeing it's effects on the circuit then (hint, find the...
  16. DaKi][er

    Spare Part Storage, Cataloguing and Organisation

    Most projects get a bag with their parts, else there is no cataloguing, and parts all over the place, I leave it to just remembering roughly what I got
  17. DaKi][er

    who like p2p

    Love it. P2p is really a dying art and something everyone should learn, there is no skill or understanding at all at taking a list of parts and a pcb and stuffing them. I remember back in highschool our first ever circuit we built was by p2p wiring, using nails hammered into a piece of wood as...
  18. DaKi][er

    Attempting to design/build an S/PDIF DAC

    Quote: Originally Posted by r_d Right, I was just pointing out that the clock rate can't be a a non-multiple of the I/O frequencies as DaKi][er had suggested. At least not with this particular IC. The ASRC resamples the audio from one sample rate to another, the 'Asynchronous'...
  19. DaKi][er

    Split-Supply Sanity Check

    You got not ground return back to your AC, needs a centre tap like the jaycar schematic, else I don't see anything else wrong
  20. DaKi][er

    Holding A PCB

    I don't see why you need anything to hold it. Just stick it on the bench/table, grab the cap and heat the other side while pulling
  21. DaKi][er

    Adjustable high pass filter

    High-Pass Filters Ignore the maths if you don't follow, the only important equation you need is - corner frequency = 1 / ( 2 * pi * R * C)
  22. DaKi][er

    My misfortune with soldering the PCM2702

    What you need is Flux and solder wick. If you paste flux over all the pins and apply a small amount of solder to your iron tip, after tacking down 2 corner pins, just dragging the iron across all the pins at the same time will solder then pretty much perfectly as the flux will make sure that...
  23. DaKi][er

    need idea for 12v motor control (alps)

    What you want is a 'H bridge', google that. Pretty much what is shown in those 2 transistor circuits
  24. DaKi][er

    Designing a Headphone Amp (with DAC) from scratch

    I cant think of anything much worse than converting your analog input to digital and SPDIF at that, just to convert it back to analog again
  25. DaKi][er

    LCD display for DAC?

    You wont find a LCD that has a spdif in/out that you can just plug in Though with some knowledge of microcontrollers, it would be incredibly easy to make one. Most SPDIF receivers (the IC's that convert the SPDIF signal into another digital format that your DAC IC actually uses) these days...