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  1. DaKi][er

    Is ripple the only spec we care for in an "audio source" PSU?

    Read all the pages here on voltage regulators, explains it all as simply as it really can be put with lots of measurements included -
  2. DaKi][er

    Post pics of your builds....

    Quote:   He also has to have trademarked the name to sue over that as well. Apart from the community frowning upon it and discouraging people against it, there is pretty much nothing you can do about it
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. DaKi][er

    soundcard clock modding to improve S/PDIF jitter?

    On crystals and jitter - • View topic - What do you guys think about these?
  11. 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...
  12. DaKi][er

    some really bad SMD soldering (example)

    With reflow soldering, the use of a bit too much solder there makes the surface tension, with the lack of a solder mask gap between interconnecting pads, pull the resistors together. They could probably fix it by using less solder, sure this doesn't look like much there but staring at mobile...
  13. DaKi][er


    I was looking to buy a custom made transformer from Germany, and I was having difficulties in getting a response from them. So I asked for some help on the forums here and GASTAN offered to help out. I sent him most of the money upfront via paypal and he did a fantastic job of contacting this...
  14. DaKi][er

    Ohm’s law help

    Alternatively, if we take the assumption that it is designed to run at 20mA, as pretty much all LED's are, then (15-12)V / 0.02 A = 150ohm
  15. DaKi][er

    DIY'ing in Australia?

    DIY in Australia isn't hard at all, just expect to pay a little more for shipping. I don't know many places at all that wont ship to Australia. And if there is a really obscure and hard to get thing, someone will be bound to help you out in ordering it, I've spent the last month trying to order...
  16. 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...
  17. DaKi][er

    SQ Difference in Transformers

    If the transformer makes a difference, then your power supply circuit isn't doing its job
  18. DaKi][er


    Stuffing a though hole and/or basic large SMD stuff it isn't needed but for fine pitch SMD and circuit rework/repairs is is pretty much vital
  19. DaKi][er

    Diy Balanced Dac

    Many DAC IC's output in a balanced fashion, but sum to a single ended output at the end. Find one you like and find a project that uses this IC and modify it to suit
  20. DaKi][er

    Post pics of your builds....

    Quote: Originally Posted by Llama16 WOW!!! I feel so humble when looking at all these homemade amps. I hope to one day be able to get the parts together to build myself one hell of a nice amp and have the right to post here . Well currently I'm building 2 cmoy's at once. As this is...
  21. 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
  22. DaKi][er

    Testing solder joints

    Leave the heat on the joint for an extra second or 2 after applying the solder, you shouldn't ever have a cold joint if you do that. And use flux and reflow it if anything looks a bit sus if you happen to overwork a joint and burnt all the flux out
  23. 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)
  24. DaKi][er

    My misfortune with soldering the PCM2702

    Quote: Originally Posted by Hayduke If you are using solder paste, you could use a toaster oven to reflow it as well. I don't recall where I saw it, but someone posted a guide to using one for that purpose. Try Google Wouldn't a heat gun do the same thing? I didn't realize you...
  25. 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...