Jump to content

cspirou

Returning Member
 View Profile  See their activity

  • Posts

    355

  • Joined

  • Last visited

 Content Type 

Posts posted by cspirou

  6. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted · Edited by cspirou

    Updating my BOM for the Dynalo Mini.

    MMBTA56/06 looks to be discontinued. As a substitute Mouser is recommending MMBTA56L/06L. Is there any reason I shouldn't use this substitute for the Dynalo Mini? The datasheets seems to match on most specs and the graphs differ a little bit

    EDIT: Oh god 32 week lead time! Fuck that!

  7. Linkwitz Labs LX Mini

    in Speakers

    Posted

    On 1/30/2018 at 10:11 AM, Craig Sawyers said:

    SL is apparently very happy to let people come over and listen - and since you are local, why not get in touch with him?

     

    BTW, even though Linkwitz has passed away you can still do this through his wife

  11. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    1 hour ago, gepardcv said:

    Wait, did anyone actually determine that the heatsinks don't help cool the transistors? That's... counterintuitive.

    The heatsinks attach to the plastic casing which I presume isn't a great heat conductor. Not too surprising. Doug is using a heatbar attached to the PCB for his T4 amp, which is a pretty clever solution.

    Also wondering if this is why my amp with the 3oz board has a lower temp. More copper to dissipate heat.

  12. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    13 minutes ago, Pars said:

    Yes, that is the same size I used.

    As I noted above, I'm not sure these run cooler with the heatsinks. I'm going to do some more testing tonight.

    I think i share this observation as well. Heatsink temp is lower then the naked transistor for sure, but i am not so sure that the transistor itself is actually that much cooler. The vented PCBs like Headamp has on their newer amps would be the way to go, or some sort of PCB mounted heatsink like this.

    7BC8D0BA-EE36-4D40-9B03-E990EB271575.jpeg.f097d3bb551d9675067bdc24b3bada4c.jpeg

  15. KGSSHV Carbon Build Thread

    in Do It Yourself

    Posted

    25 minutes ago, P3t4 said:

    Hey guys,

    I have been stuck for about 10 months on getting my custom case ordered. Most of the companies I have enquired have either dismissed me or given me astronomical offers, such as, $15,000 for a single case.

    Do you know of reputable shops who could manufacture my case? Also, if any of you have access to proper machinery and is willing to attempt this project, I would be more than happy to compensate accordingly. We could also possibly arrange a group buy if there are enough people interested in my case. I have to build mine first to make sure the thermals are okay, of course.

    Thanks in advance!

    That sounds way overpriced. You can get a KGSSHV from Mjolnir Audio for far less.

    Most people here use modushop or diyaudio store and get the panels CNC'd with modushop or use Front Panel Express. It's not super cheap, but won't be anything close to $15,000.

    There's also a bunch of vendors in China that do a pretty good job, but I don't know how to navigate that area.

    • Like 1

  16. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    3 minutes ago, Whitigir said:

    It turned out pretty sweet, and only the jumper legs were tricky as I had to sneak-in a piece of solid silver conductor as I think it would conduct better.  Needless to say, I was doing it and praying, and it turned out ok.

    The jumpers don't transmit any significant current, they just are used to set the voltage. So silver solder is definitely overkill.

    • Like 1

  17. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    My main concern with battery isn't so much noise but the varying voltage as power draws down. Usually this means some sort of power management circuit in between the batteries and the amp which can have their own noise. Also with a bipolar power supply there's an issue of one rail powering down before the other, leading to a large DC offset.

    I'm sure Sony has a very competent implementation though.

  21. (closed) Dynalo Mini enclosure group buy

    in Do It Yourself

    Posted

    From checking the shipping status it seems like everyone received their cases and there was zero losses.

    I just wanted to thank everyone for participating in this group buy and trusting me with your money. The PDFs in the OP can be used if you want to order more at Enclosures & Cases Inc or they should work without any modifications at Context Engineering. I'll try to release a generic file of dimensions eventually which you can adapt to any enclosure.

    I also have some odd n ends that I will have for sale soon. Just few extra front plates and sides that they included, but nothing that amounts to a complete enclosure. I'll also make the prototype case available cheap.

    Also thank you everybody for covering my cases. It was an unexpected and very welcome gift. I don't really do this expecting a reward or compensation, but it's still very appreciated.

    • Like 5
    • Thanks 1

  22. Balanced to unbalanced board

    in Do It Yourself

    Posted · Edited by cspirou

    I only know one person so far that did the SMD version.

    He says it gets pretty toasty and needs heatsinks. He also did a few mods. On my Dynalo Mini I mounted the LEDs backwards initially and it drove the temp really high.

    Read his posts because he also changed a few things that you should probably implement. I plan on building it too but have some other projects in my queue I need to finish.

    first thing i would ask is does it work without the buffers?

    • Like 1
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.

  I accept