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About cspirou

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  1. Dynalo Mini enclosure group buy

    Short answer because I'm in the middle of a trip but no sooner then the 20th. I might tie the date with the PCB group buy so everyone has an opportunity to buy an enclosure
  2. Dynalo Mini enclosure group buy

    And that puts us over 25. Price is now $8 cheaper
  3. The Multi Amp aka Dynalo Mk2

    Be sure to use kapton tape to protect the Meanwell before doing rework. The plastic case on mine melted a little when I was removing LEDs.
  4. The Multi Amp aka Dynalo Mk2

    I think Vf is close to the same. I measure 1.68V with mine
  5. The Multi Amp aka Dynalo Mk2

    Since you are using different input transistors I would think that has an effect. Are you using 422 ohms for the CCS? Should that be reduced back to 402 like it was originally?
  6. The Multi Amp aka Dynalo Mk2

    I did the same thing for adjustment and it works well. I was able to get it within 3-5mV and the servos drop that <1mV. I see discrete transistors instead of a that340. Nice
  7. Dynalo Mini enclosure group buy

    The screws for the bottom panel also do double duty for attaching rubber supports. Holes were not included in my drawings because I dont know where they are located yet. Using the IEC screws sounds like the best way though as you mentioned. So no additional modifications to the rear panels for now.
  8. Dynalo Mini enclosure group buy

    @Kerry - Do you know what kind of screw the RCA uses? Also do I need to add an additional hole for chassis ground?
  9. Linkwitz Labs LX Mini

    An LXMini system has been on my list for awhile. Recently Nelson Pass made an ASP for it which should be available on diyaudio eventually. If you do get around to auditioning this ask Linkwitz if you can hear the ASP version to compare.
  10. Dynalo Mini enclosure group buy

    I asked Kerry once on the Dynalo thread what thickness was required for the panels and he said 0.1" (2.54mm). I believe the XLRs go up to 2.7mm panel thickness. I'd prefer 0.1" but I have no problem with 0.09".
  11. Dynalo Mini enclosure group buy

    Panel thickness is 0.09" or close to 2.25mm. Corner screws are counter-sunk by default but not indicated in my drawing. I thought about doing a blind hole for the potentiometer, but it seems unnecessary with 2mm panels.
  12. 2018 PCB Group Buy with TKD pots

    $50 isnt that bad. I think they were $40 when I got them directly from TKD. Is there a minimum order?
  13. What Are You Building Today

    Those DIYA switchers look like they use TSP7A regulators, just like the Dynalo Mini
  14. The Multi Amp aka Dynalo Mk2

    When installing the heatsinks for the onboard regulators do you need any insulation? I just applied thermal paste to the heatsinks and then just placed them directly on the PCB. The thermal pad is tied to ground and the heatsinks are anodized so I wasn't worried about heatsinks having any sort of voltage potential. But if it's better to have a mica insulator then I can add one in.
  15. The Multi Amp aka Dynalo Mk2

    I'm using the stock 255 ohm resistors for bias. Although they are Panasonic instead of Vishay since they were in stock. I believe John said his reached 75C without heatsinks and that's matched what I measured after leaving it on for 2-3 hours. Its also winter time and the house is cold so I don't know how much of a factor that is. However I did find that the that340 chip now measures 70C as Astro mentioned. I don't think that the heat is transferring efficiently to the heatsink and the gap between the transistors has made a sort of heat tunnel for the hot air to escape. The that340 chip is in between and is getting a blast of hot air from both sides. I should redraw the vents for the GB enclosure Also Im measuring with an IR gun and it varies a lot around the heatsink fins. It would be more accurate if I attached a thermocouple to the heatsink.