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First DIY build :)

Discussion in 'Night Vision Optics and Illumination' started by Robster9, Jul 26, 2014.

  1. Robster9

    Robster9 Well-Known Member

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    Hi, been studying the threads on here and have started to formulate a plan, never attempted anything like this so i am properly excited!!

    Basically have decided on E700 camera and 5" TFT monitor from that auction site. Going to source a T20 Ir to make it work.

    Just thinking about the battery and for safety sake and ease of transaction I'm going to

    http://www.elwirecraft.co.uk/340/el...1800mah-2800mah-or-5000mah-for-el-driver-led/

    Just 2 questions, will need a charger so could you please tell me the difference between 1A and 2A? I'm guessing it's charge time.

    Also will the smallest battery give me about 4 hours run time in the rig I'm planning? Not sure I the middle size battery might be better?

    Thanks in advance, Rob.

    Ps will definitely take pictures when I get going...if you fancy a laugh it may be good viewing!!!
     
    Last edited: Jul 26, 2014
  2. SteveO

    SteveO Top Poster

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    Difference between the 1A and 2A is the speed of current at which it charges the batteries, if the battery is capable of 2A I would go for the maximum if you need to use it again quickly but it may wear the battery out sooner in the future, a slower charge will prolong battery life.

    My batteries only charge at 1A and can take up to 12 hours to get a full charge, in use they last for about 5 straight hours powering the screen and camera and are supposedly 6800mAh if the figures are to be believed but realistically I suspect the battery would be half that power.

    I suspect the smallest battery you are looking at will yield about 2 hours running time at best.
     
  3. jdk1

    jdk1 Engaging Member

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    I use one of the e l wirecraft 1800mah batteries with an E700 and 5" screen and have never had it run out on me although i do turn it off between shots , i charge it before use every time and it never seems to be more than 2-3 hours before they are charged.
     
  4. terry1001

    terry1001 Major Poster

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    I would suggest you go for the medium battery pack and the slow charger, it's a 2800mah battery so a 1 amp charge shouldn't take more than 3 hours but it might be longer if the charger reduces the current as it nears full charge. The Chinese batteries and chargers don't normally have anywhere near their claimed capacity but these should be much better.
    I made my latest pack myself using 18650 cells wired up for balance charging from a RC battery charger which charges each cell to the same voltage which doea work well but the chargers are expensive if you have no other use for them.
    You should be able to get your 4 hours run time out of it but it's best to turn off when not actually in use. If you're after an ir torch drop me a message and I'll try and help you out.
     
  5. Robster9

    Robster9 Well-Known Member

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    Thank you for all the advice above, have ordered the medium sized battery and 1A charger, can't wait for it to arrive!

    Picked up the floplast bits from screw fix mentioned on the earlier threads and can see how the camera will fit on. Only problem is that the straight coupling part will not quite fit over the rear of my Bushnell Legend, have ground the inside back a bit with a dremel and it now fits over just the rubber part of the eye piece. It stays on but I'm not sure that there will be enough of an overlap to fix it wen the camera and wiring are added. Does anyone have any advice on how I could rectify this, how far does this part need to slip over the eyepiece? I saw something on a thread where two threaded rings were used but couldn't work out how it was done? Don't want to resort I lots of electrical tape!

    Cheers, Rob.
     
  6. SteveO

    SteveO Top Poster

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    Get yourself one of these - http://www.ebay.co.uk/itm/290640430...eName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

    I find the 45mm x 100mm will fit most scopes, force a 40mm straight coupler into one end until it's flush (Pic 2), a bit of spit helps lubricate it. The empty end goes over the scope eye bell and secures with a 50mm jubilee clip, the beauty of the jubilee clip is you can adjust the camera mount in and out and to any angle to ensure a good alignment of the crosshairs and then tighten, the rubber tube will take a knock and always return to your set position, saving hassle having to re-align it in the dark.
     
    Last edited: Jul 26, 2014
  7. Robster9

    Robster9 Well-Known Member

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    Thanks Steve, would never have thought of that it's perfect. Must admit that when I read 'bit of spit helps lubricate it' I thought you were winding me up!
     
  8. subzeer0

    subzeer0 Engaging Member

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    i would even say ditch the elwire craft battery and get a 5x2 nimh battery pack...i have used it succesfully over my last 5 builds and the run time from charged to drain is well over 9 hours constant use, with aa ebay 4.3 monitor and an e700pub...had too many failures of the lipo batteries and not much difference in size

    but as always yours might fare better
     
  9. Robster9

    Robster9 Well-Known Member

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    Well here it is. My first attempt at night vision! Please excuse the clutter as I have a small flat and no rifle rest!

    Haven't started tidying the cables up yet but they all fit neatly into the pouch attached to my stock. Next thing is to get it out at night and give it a test! Can't wait. Thanks for all of the help above, Steve, the rubber coupling worked a treat thanks mate, it's my first go so sure I can put together something a bit more like your picture given a bit more time.

    [​IMG]
     
    Last edited: Aug 1, 2014
  10. reaper1064

    reaper1064 Engaging Member

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    Nice going mate.
     
  11. Robster9

    Robster9 Well-Known Member

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    Just realised that the screen size was wrong in the photo..... still learning!
     
  12. SteveO

    SteveO Top Poster

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  13. Robster9

    Robster9 Well-Known Member

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    Thanks Steve, I have the standard clamp that comes with the T20at the moment but your setup is much better and looks solid. Will order those bits next month when my bank balance recovers!

    Thanks for all your help, can't wait to get out ratting!
     
  14. Silverfox

    Silverfox Active Member

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    Nice one !! Thanks also to Steve for the info on the scope mounting sleeve.
     
  15. Robster9

    Robster9 Well-Known Member

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    Last night was the first night out with the home build and I am very impressed with the clarity of the camera. I was sat inside a barn for most of the night as it was lashing it down! The system went together surprisingly quickly even by torch light and stood up to being fiddled with and carried about well. Only thing that bothered me was that even with the brightness turned all the way down on the monitor it still gave off a lot of light which lit me up like a beacon! Going to get my hands on some red acetate to see if that helps any. The image brightness did seem to flicker a bit as well even when the rifle was resting but I guess that is just the camera trying to make sense of the image. All in all I'm really chuffed for well under £200!
     
    Last edited: Aug 9, 2014

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