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Millett "Starving Student" hybrid amp

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  1. n_maher Contributor
    Quote:

    Originally Posted by tomb /img/forum/go_quote.gif
    On the other hand - if you look at Nate's pics, he used screws. Unfortunately, I think we're stuck with pulling the pins out if you go that route. I didn't see any "no pin" options for the size heat sinks we need at Mouser or DigiKey.



    Just a word of warning, I've never successfully pulled a pin from a heatsink. I've tried, not all that hard, but it seemed like it would be a recipe for bad things to happen.

    Someone should have a closer look at 707-411626B25 from Mouser, I don't see any pins and I think that this part would be sufficient. Actually, 707-411621B25 might be fine as well.
     
  2. bhjazz Contributor
    I'll look into that one later today, Nate. Nice catch...I was seconds from clicking CheckOut at Mouser!

    I tried to find those heatsinks at the Comair Rotron website, but Mouser seems to have fudged the part numbers. There are some similar ones there, but not the matching ones. Still, the idea of the mfr having tapped holes seems a lot better than me flailing around with a running drill in my hand.

    Off to Costco. Sure wish they had a DIY aisle...

    "Teach a man to DIY, and he'll sit and wow at his creations. Teach a man to shop at Costco, and he'll eat like a king."
     
    eimis likes this.
  3. tomb
    Quote:

    Originally Posted by n_maher /img/forum/go_quote.gif
    Just a word of warning, I've never successfully pulled a pin from a heatsink. I've tried, not all that hard, but it seemed like it would be a recipe for bad things to happen.

    Someone should have a closer look at 707-411626B25 from Mouser, I don't see any pins and I think that this part would be sufficient. Actually, 707-411621B25 might be fine as well.




    Thanks for those links - guess I wasn't looking at this "Comair Rotron" brand. (I never tried pulling a pin, either.[​IMG] )
     
  4. trains are bad
    I had to use 215kOhm resistors because I didn't have any 220s. I don't suppose this will be a problem, will it?
     
  5. Gross
    Yeah, as far as pulling pins on those heatsinks, it sucks. They do not come easily, at all. If you can find pre-tapped, or even just holes, go for it. Tapping holes is easy enough, and I've never liked the idea of tapping with a drill, I always do it by hand.
     
  6. rds
    In my experience standard hardware store washers (I think they're silver-nickel plated) accept solder pretty easily.
    Just get a coating solder on the washer first, then put it in place and it should be the same as soldering to a pcb.
     
  7. rds
  8. malldian
  9. bhjazz Contributor
    Quote:

    Originally Posted by trains are bad /img/forum/go_quote.gif
    I had to use 215kOhm resistors because I didn't have any 220s. I don't suppose this will be a problem, will it?



    I don't think it will. At the very least all four (R2, R4, R8, R10) should all be the same, which you've covered. My only question would be the voltage change now going to the tube on pin 1 (and across C2).
     
  10. Gross
    Quote:

    Originally Posted by malldian /img/forum/go_quote.gif
    If you guys think this is big enough, I found my case:

    Newegg.com - Computer Parts, PC Components, Laptop Computers, Digital Cameras and more!




    I don't think that case will work very good in this application. It is just too small. The capacitors will hardly fit in there, let alone having to wire everying and then slide it in from the side. That would be a damn slick case for an AlienDAC or something those.
     
  11. bhjazz Contributor
    Quote:

    Originally Posted by n_maher /img/forum/go_quote.gif
    Someone should have a closer look at 707-411626B25 from Mouser, I don't see any pins and I think that this part would be sufficient. Actually, 707-411621B25 might be fine as well.



    In the end (and the end is at about 11:30 this evening) I chose the 707-411626B25. The thermal properties looked better than the one that is on the BOM, and if I need to switch out of my proposed wood box to accommodate these, then so be it.

    Onward! (Hey, I got some Alien DAC parts while at Mouser, too! W00t!)
     
  12. dominion
    AWESOME. someone sell me one o.o.
     
  13. trains are bad
    Quote:

    Originally Posted by bhjazz /img/forum/go_quote.gif
    I don't think it will. At the very least all four (R2, R4, R8, R10) should all be the same, which you've covered. My only question would be the voltage change now going to the tube on pin 1 (and across C2).



    Well 220 * .05 is 11, and 220 - 215 = 5, so given that 5% resistors were spec'd in the original starving student design, I reasoned I would be fine. That was my justification anyway.
     
  14. royewest Contributor
    OK, I just finished ordering the parts for this, except for the:

    150uF 63V low-ESR electrolytic capacitor

    Which are backordered at Mouser. I'll try my local shop, but any suggestions for alternate parts for C1,C3,C5,C6?

    Thanks,

    __Roy
     
  15. synaesthetic
    Try checking a different manufacturer for a similar part?
     
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