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Flyingsparks

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About Flyingsparks

  • Rank
    Newbie
  • Birthday 07/19/1983

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Converted

  • Location
    Munich, Germany
  • Headphones
    Stax SR-007mk1, SR-Lambda, SR-X mk3, Heir Audio 4.A, Koss PortaPro
  • Headphone Amps
    KGSSHV Carbon, KG Dynalo Mini x2, Stax SRM-007t

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  1. Flyingsparks

    The Multi Amp aka Dynalo Mk2

    No problems, thanks for clarifying. I think you had suggested in previous posts to collect the info together, so that is what I'm trying to do. Now I have to wait for the heatsinks to arrive.
  2. Flyingsparks

    The Multi Amp aka Dynalo Mk2

    Thanks for the confirmation Pars. Seeing you have the spice sim set up, does the drop of R14,R29 from 255 to 240ohm also result in a drop in Bias? Looking at the circuit and thinking about the behaviour, it makes sense to me. I just got rather confused by past posts. This started as a wish to collate the results posted of different configurations. For completeness I will probably initially populate the 2nd amp with the Bivar LED's, as I ended up ordering both. Cheers
  3. Flyingsparks

    The Multi Amp aka Dynalo Mk2

    Hi All, I have my first of two Dynalo minis populated. I fell into the same trap as Congo with the orientation of the 680 ohm resistors, but once fixed it came up without issue. I had already checked and tweaked the on board regs. My question is about the biasing. I started with the default recommended 422ohm and 255ohm. Then I tried adjusting the combinations as others have before, and I am summarizing what I found into a table. However, I seem to have the opposite effect to Pars, which is confusing me. I have the Liteon LED's, and +/-20V supplies. With R1,R3 = 422ohm, R14,R29 = 255ohm: 13mA With R1,R3 = 402ohm, R14,R29 = 255ohm: 16mA With R1,R3 = 422ohm, R14,R29 = 240ohm: 11mA With R1,R3 = 402ohm, R14,R29 = 240ohm: 13mA Can someone help explain this? Attached document is my collection of bring-up notes and some copy-pastes from the forums. https://docs.google.com/document/d/1iJ_jL2ojQpJ2f_3crzrbiI6Gti7ZWHiXPHGWbkdjHDA/edit?usp=sharing
  4. Flyingsparks

    (closed) Dynalo Mini enclosure group buy

    Picked up the package from customs today. Looks great. Thanks
  5. Flyingsparks

    (closed) Dynalo Mini enclosure group buy

    Cspirou, I would like the holes for any externally visible screws countersunk. How are you collecting that info, and do these small customizations impact the price? As you asked I'm providing my request, but I would assume this compicates the group buy a bit.
  6. Flyingsparks

    (closed) Dynalo Mini enclosure group buy

    Paid, but unfortunately left my username off the payment. Cheers, Stefan Sent from my LG-H930 using Tapatalk
  7. Flyingsparks

    (closed) Dynalo Mini enclosure group buy

    I broke for a second If an alternative colour does end up happening, I'd be keen for Silver anodize on both. Otherwise black is fine too. Sent from my LG-H930 using Tapatalk
  8. Flyingsparks

    (closed) Dynalo Mini enclosure group buy

    I'm interested. Sent from my LG-H930 using Tapatalk
  9. Flyingsparks

    KGSSHV Carbon Build Thread

    Out of interest, does anyone know of a voltage selector for 100-115-230V. I have two 115V primaries with 100V taps. I just use jumpers for now.
  10. Flyingsparks

    KGSSHV Carbon Build Thread

    Thanks. I ran out of bench space to fit more meters The thermal camera is a Infratec VarioCAM hr Research with the IRBIS3 software. The amp is in a 2U modushop case. I got motivated to try out the things I learnt in the Keysight scope month videos.
  11. Flyingsparks

    KGSSHV Carbon Build Thread

    So I finished my my KGSSHV Carbon a few weeks ago. Been too busy listening to it, but I thought I would share my effort and measurements. I am lucky enough to have access to some test gear that allowed me to take thermal pictures of the amp and some further analysis such as frequency response. I also put together a bring up guide that I used. It is basically a summary of what others have already come up with here in posts. it can be viewed at: KGSSHV Carbon Bringup Guide Attached is the test report. And yes, the wiring still needs to be tidied up in that picture, especially the grounding. I was a little impatient, plus I still need to design a small latch and inrush limiter circuit for the momentary switch. For now the switch on the IEC connector makes do. KGSSHV Carbon - SR17001.pdf
  12. Paid Sent from my SM-G930F using Tapatalk
  13. I received mine Sent from my SM-G930F using Tapatalk
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