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cspirou

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About cspirou

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  1. cspirou

    The Multi Amp aka Dynalo Mk2

    @MASantos i need to order some parts for myself soon. I can add the MMBTA56 transistors to my order
  2. cspirou

    The Multi Amp aka Dynalo Mk2

    I haven't built a 2oz board yet. Just comparing the reported temp of @Whitigir vs what I have, which is closer to 70C max. I'm sure building the 2oz board is much easier. Although the 3oz board wasn't so bad after I got a soldering strategy down. Plus I have a DIY reflow oven which helps with a lot of components.
  3. cspirou

    The Multi Amp aka Dynalo Mk2

    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.
  4. cspirou

    The Multi Amp aka Dynalo Mk2

    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.
  5. cspirou

    The Multi Amp aka Dynalo Mk2

    @Whitigir - Did you drill another hole?
  6. cspirou

    The Multi Amp aka Dynalo Mk2

    That is one blinding LED. Nice work! Where did you get the heatsinks for the THAT chips? For knobs I was going to go with diyaudio or Parts Connexion
  7. cspirou

    KGSSHV Carbon Build Thread

    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.
  8. cspirou

    The Multi Amp aka Dynalo Mk2

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

    The Multi Amp aka Dynalo Mk2

    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.
  10. cspirou

    The Multi Amp aka Dynalo Mk2

    What is the preferred potentiometer value if I go with 2sk170/2sj74 jfets instead of the THAT chips? Still 10k?
  11. cspirou

    2018 PCB Group Buy with TKD pots

    I think there's a another version of the SMD diamond buffer used for the ubal -> bal boards with a servo.
  12. cspirou

    Balanced to unbalanced board

    Nice @jose! What are the Mundorf capacitors for? I thought this was DC-coupled?
  13. cspirou

    (closed) Dynalo Mini enclosure group buy

    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.
  14. cspirou

    Balanced to unbalanced board

    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?
  15. cspirou

    (closed) Dynalo Mini enclosure group buy

    Oh good. I was starting to worry about yours. Now just two more left. I think they are in some sort of shipping purgatory. Or the tracking just hasn't been updated
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