How to Pass a little time ...cont

Discussion in 'DIY' started by dBel84, Oct 22, 2018.

  1. Pancakes

    Pancakes Friend

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    Got in on the ACA mini clone board buy and Nelson was a legend as always and provided the Harris output devices. If an amp can be cute, it's this one. Perfect desktop size at roughly 5 inches square. My desktop setup is not for critical listening so this is not a review. I'll just say it sounds wonderful. Perfect project for someone wanting to get into DIY whenever it makes it to the DIY store. Parts cost was ~$200 so I assume that's how much the kit will end up being.

    Using a WHAMMY as preamp.

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    Last edited: Mar 5, 2022
  2. Pancakes

    Pancakes Friend

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    I wanted to take the speaker wire and RCA cable strain off the ACA mini circuit board and also wanted some minimal protection from accidental bumps. And needed to keep the whole thing well ventilated since the heatsinks are internally mounted. And I didn't want to put too much effort into it. Also added a P089ZB SMPS filter. Got some makerbeams and precut aluminum squares from Amazon and ended up with this :D

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  3. Laluciol6990

    Laluciol6990 Rando

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    Hi
    One question, based on the early M2x prototype, post #1 picture https://www.flickr.com/photos/[email protected]/44156803184/
    Would the author say the thermal were OK with those heatsinks ? (for like 2h listenning session in a 21 degrees C environment)
    Thanks a lot if the author has an answer
    Have a nice day
     
  4. dBel84

    dBel84 Friend

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    It gets hot and as I keep it inside a shelf, I use a base with a fan in it. I have used it without a fan too but it gets to 50deg C
     
  5. Pancakes

    Pancakes Friend

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    Nelson Pass' temp scale (hand on heatsink):

    "Blimey hot is 10 seconds hands on = 45 deg C.
    Crikey hot is 5 seconds = 50 deg C.
    Bloody hot is 2 seconds = 55 deg C.
    X*[email protected]! is 60 deg C.

    All of these are within an acceptable range, although X*[email protected]! is reserved for the more mature constructor."
     
  6. dBel84

    dBel84 Friend

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    then this is at least 60 deg :D
     
  7. Laluciol6990

    Laluciol6990 Rando

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    Thanks! Nice to know you used a fan under it when inside a shelf. I am debatting a chassis for an M2x. Size wise, i would like a Mini Dissipante 3U (from Moduloshop / Hifi2000). I thought your initial built might be a good comparison.
    Given what you mention, Mini Dissipante 3U might be too little dissipation for passive cooling.
    Have a nice day
     
  8. Pancakes

    Pancakes Friend

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    For a desktop solution it doesn't make sense to use a preamp so I've added a passive pot. I suppose I might as well throw the guts of a Modi in there and make it a full fledged integrated lol.

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  9. Pancakes

    Pancakes Friend

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    I wonder if I should add a couple of small (10uf?) caps at the pot. Any thoughts?
     
    Last edited: Apr 7, 2022
  10. dBel84

    dBel84 Friend

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    It looks like the amp has an input cap on the schematic, that should block DC from getting through
     
  11. Pancakes

    Pancakes Friend

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    Doh! You're so right.
     

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