Just finished building my Eggtimer

Discussion in 'Rocketry Electronics and Software' started by John Kemker, Oct 12, 2019.

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  1. Oct 12, 2019 #1

    John Kemker

    John Kemker

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    Took about two hours. Used my variable-temp soldering iron and a vacuum parts handler that I picked up on eBay for less than $20. As you can see in the photo, it looks a LOT like an aquarium pump, but has two vacuum lines and the parts pickers. Simple to operate, just place your finger over the hole on the side and make sure the part is flat against the tip of the picker. It came with two sizes of pickers, both of which look like syringe needles with flat tips, rather than sharp ones. The A/C line cord is too short and it has NO off switch, just a "low" and "high" vacuum switch. However, for under $20, it's not bad.

    Eggtimer powered up and talks on WiFi just fine. Working through the rest of the tests to see if I got it all correct.

    [​IMG]
     
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  2. Oct 14, 2019 #2

    cerving

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    Congratulations! Good tools and patience go a long way in building Eggtimer products... :)
     
  3. Oct 14, 2019 #3

    Lawndart

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    Welcome back.
     
  4. Oct 18, 2019 #4

    John Kemker

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    Thanks, Dale!
     
  5. Oct 26, 2019 #5

    John Kemker

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    Tests complete. My e-matches arrived and I was able to test arm, then test deployment.

    Lesson learned: Always connect/turn on the main battery before attaching the e-matches.
     
  6. Oct 27, 2019 #6

    mccordmw

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    Love my eggfinders and egg timer quantums. Fun to build and super reliable. They srrved me well for my L1 though L3.
     
  7. Jan 9, 2020 #7

    gcanroc

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    Do you have a link to your pump and is using a pump better then tweezers. I’m just about to start putting together a eggfinder quantum and I could use all the help I can get.
     
  8. Jan 9, 2020 #8

    Charles_McG

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    That’s not true for the Quark. What happened?

    I did have a Quark that fired one ematch on startup- but it was a bas CPU. I must have cooked it during construction.
     
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  9. Jan 9, 2020 #9

    John Kemker

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    https://www.ebay.com/itm/AC-220v-QS...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

    Better than tweezers? Not sure about that. My pump is a bit weak. Also, would wish for angled tips. For $20, it's not bad, but I could have chosen better.
     
  10. Jan 9, 2020 #10

    cerving

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  11. Jan 10, 2020 #11

    John Kemker

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    And the hot-air station I recently purchased came with a couple of tweezers, at least one of them angle-tipped.
     
  12. Jan 10, 2020 #12

    gcanroc

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    How did your hot air station hold up??? If it’s one that you would recommend could you please post the link and the solder paste that you use. I’m anxious to try hot air soldering on my quantum for the smaller components.

    Geoff
     
  13. Jan 11, 2020 #13

    OverTheTop

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    Personally I prefer tweezers, but vac tools (electric or mechanical) work similarly.

    Personally I also prefer the angled-tip tweezers (with reverse-action, self-closing design) and when learning these helped a lot. Pointy tweezers were problematic at the in my early days of SMT work. Tweezer skill is really king for this type of soldering. I now routinely swap hands (tweezer/iron) as needed. With practice this becomes possible, and also the type of tweezers used becomes irrelevant, based on my experiences. YMMV.

    FYI, if you get the type of tweezers I use you put your fingers at the crossover point. That way, by rolling your fingertips either way, you can open or close the tweezers and control the pressure on the tips ;).
     
  14. Jan 11, 2020 #14

    Greg Furtman

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    Geoff, I'm not sure which unit John bought but I bought one like this & it works well. I've done several projects and it's holding up good.
    https://www.amazon.com/dp/B075TBZ47M/ref=dp_cerb_2

    And this is the paste I bought. And it too did the job.
    https://www.amazon.com/gp/product/B017RSZFQQ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
     
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  15. Jan 11, 2020 #15

    beeblebrox

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    Glad you guys can do that...My eyeballs can't cooperate to see the tiny parts. I can't read the designations on them. So for me the best method is Connor McGrath! He does not charge a lot and he tests them out. As for actual testing I created a way to do real test of the unit without the need of expensive equipment. Attach tiny Christmas tree light bulbs (Incandescent type) to the outputs. Arm the unit, (Carefully) drop the unit with battery into the bottom of a GLASS 3, 5 or 7 gallon water bottle. (Don't try a plastic one, it WILL collapse) Hold the hose of a vacuum cleaner over the neck of the bottle. turn on the vac until the vac's rpm stops climbing. (Max vacuum, fan is stalling) Holding the hose firmly, slowly release it from the bottle letting air back in. The drogue channel should fire right away, then a little later the main channel will fire. I used a yellow bulb for drogue and red for mains. since the altimeter is reacting directly with change of air pressure it is a true test. the bonus: you get an altitude reading that corresponds to the efficiency of your vacuum cleaner. Better suction = higher altitude reading. Test a good vac vs a cheap one to see the difference. My slightly tired Electrolux pulled a vacuum equivalent to about 5200'
     
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  16. Jan 11, 2020 #16

    mbeels

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    I've had good luck with this one. It is certainly not a high end model, and the side bracket broke off pretty soon after I started using it, but it works well as a hot air station.

    https://www.circuitspecialists.com/hot-air-rework-soldering-station-csi900+.html
     
  17. Jan 11, 2020 #17

    John Kemker

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    Here's the one I bought. Looked through Amazon for price/ratings and read the ratings thoroughly before making the decision. I'm aware that some ratings are inflated, so kept a critical eye on them. All-in-all, I think I got a pretty good value for my money.

    https://www.amazon.com/dp/B07X5SFJNR?psc=1&ref=ppx_pop_dt_b_product_details

    I need to get some practice with it before I tackle the Eggfinder TRS or the LCD GPS module.
     
  18. Jan 12, 2020 #18

    cerving

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    Circuit Specialists is my go to place. Good products at competitive prices, and you have somewhere to go back to if you have questions (unlike the Chinese vendors).
     
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  19. Jan 12, 2020 #19

    John Kemker

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    I'll keep them in mind for future purchases!
     
  20. Jan 12, 2020 #20

    John Kemker

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