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Thread: Self powered 2W RGB projector + built in 160W amplifier and 120V inverter for laptop

  1. #1
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    Default Self powered 2W RGB projector + built in 160W amplifier and 120V inverter for laptop

    I had that crazy idea in my mind for last few days and i decided to go forward with that.

    When i choose dthe projector case, i knew that i would add things and that i would need some room left inside.

    The case is from goldenstarlaser and is the H-RGB1800 with rounded sides


    The integrated added features are:

    -11Ah 13.2V Lithium Phosphate diy battery with BMS
    -150W inverter and 120V outlet for powering things like laptop or other low power show acessories
    -a stereo 160W amplifier powewred by the battery too ( the inverter too is )

    So i'll be able to make some great show projections indoor or outdoor and will only need to cary the projector and a laptop.. or even a smarthphone !

    I have made the battery with dissassembled Dewalt 18V Li-Ion battery ( 4 groups of 10x 1.1Ah cells in parallel each ( same 18650 format as the laptop)and then all connected in serie. These cells can deliver up to 60 times their rated capacity in current ( 11Ah = 660A for short term and 330A continuous).. Yes 330A!.. but the choice of these cells was not for their power, but for their large tolerance at low temperature and for long period storage and also their stable and safe chemistry. I'm using a 30A 4s BMS that equalize them and protect them.

    The 150W inverter is small enough to fit under the top cover, just like the battery are and is connected to the battery. The inverter output is divided in two, one for psu of the 3 lasers, dac and galvo and another for the 120V outlet on the back panel ( for connecting the laptop)
    There is a DPDT switch on the back panel that will select wich 120V power is supplying the laser show components ( the inverter output or the main oem 120V input of the projector)

    The amplifier is an ultra compact dual 80W class D high efficiency circuit that require about 35V DC to operate. I added a 150W Boost converter to raise the 12V voltage of battery to get 35V DC to supply the ampifier input. It's a single rail.

    I will also add a 1/8 stereo jack on the back panel for the audio signal from the laptop hearphone output and 4 banana plug for the speaker signal output.

    The OEM sensivity knob of the audio mic is useless for me so i will replace it by a stereo pot to adjust the amplifier level rater than have to play with the unprecise touchpad of my laptop.

    The goal of all that advanture is to be able to cary that great projector everywhere i want to be able to quickly make a laser show with music. and have fun with friends, familly or for the public during party occasions.

    I have 2 great compact 2way outdoor speakers from Northen Audio that have great dispersion.

    I measured the power consumption o fthe laser projector and it's about 40W average at the inverter 12V input with the galvo at 30K and 3 lasers and the amplifier should draw average 80W so i should be able to get about 1hour of non stop show with music or 3 hours without the built i audio used.

    I have couples of holes to drill and file on the back panel for the switch and wiring to finish and i should be able to get it 100% completed for the weekend.

    I will post pics as well !

    Update 3 Feb 2013
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    Doc
    Last edited by Doctorbass; 02-03-2013 at 15:31.
    Pangoline Quickshow FB3
    H-RGB1800 with DT40 and Laserwave OEM pro S modules (r637nm 190mWg532nm 710mWb447nm 850mW)
    Old set of G120 scanners and one Cambridge 6850
    1.4W 445 blue pointer

  2. #2
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    Fucking brilliant, a portable laser. Get in a car and play space invaders in your town or village.
    Last edited by laserLips; 02-01-2013 at 01:25. Reason: I am a dysfunctional typist

  3. #3
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    Very good idea and an excellent choice of components. These mass marketed batteries are a good value for the price. What does the projector consist of and how will you recharge the batteries?

  4. #4
    Bradfo69's Avatar
    Bradfo69 is offline Pending BST Forum Purchases: $47,127,283.53
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    Do I understand you correctly to say that you are using a total of 40 batteries in this thing?

    Dewalt 18V Li-Ion battery ( 4 groups of 10x 1.1Ah cells in parallel each ( same 18650 format as the laptop)and then all connected in serie. These cells can deliver up to 60 times their rated capacity in current ( 11Ah = 660A for short term and 330A continuous).. Yes 330A!.. but the choice of these cells was not for their power, but for their large tolerance at low temperature and for long period storage and also their stable and safe chemistry. I'm using a 30A 4s BMS that equalize them and protect them.

  5. #5
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    Quote Originally Posted by planters View Post
    Very good idea and an excellent choice of components. These mass marketed batteries are a good value for the price. What does the projector consist of and how will you recharge the batteries?

    The projector is consisting of:

    -DT-40 pro scanners
    Laserwave red 637 0.19W
    Laserwave blue 447 1.1W
    Laserwave green 532 0.7W
    3x 3 axis tilt mirror adjust
    GoldenStarlaser HRGB1200 case + flight case

    Recent Added features:
    -Internal 11Ah 13.2V LiFePO4 lithium battery ( diy)
    -Internal 150W inverter to provice AC to the laptop psu and also to power the laser itself ( 150W is just perfect power for both)
    -switch for Dual speed fan ( silence mode or full blast mode)

    Future upgrade coming ( once i receive the parts)
    -Integrated stereo class D amplifier of 180W rms powered by the lithium battery
    -Boost converter to boost the lithium voltage from 13.2V to 36V dc for the amplifier circuit
    -Jack 1/8 stereo connector on the back pannel of the laser case for receiving the laptop audio signal output
    -4 Banana plug for the audio amplifier output.


    Note these lithium cells are so powerfull that i could boost any car with a V8 engine even at freezing temperature !!


    To recharge the battery i only have to connect the normal 120V input and when the main power switch is turned OFF, the charge current begin. It's a 4s 1Amp RC balancing charger.


    Doc
    Last edited by Doctorbass; 12-03-2014 at 21:24. Reason: correction
    Pangoline Quickshow FB3
    H-RGB1800 with DT40 and Laserwave OEM pro S modules (r637nm 190mWg532nm 710mWb447nm 850mW)
    Old set of G120 scanners and one Cambridge 6850
    1.4W 445 blue pointer

  6. #6
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    Quebec city
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    Quote Originally Posted by Bradfo69 View Post
    Do I understand you correctly to say that you are using a total of 40 batteries in this thing?

    Dewalt 18V Li-Ion battery ( 4 groups of 10x 1.1Ah cells in parallel each ( same 18650 format as the laptop)and then all connected in serie. These cells can deliver up to 60 times their rated capacity in current ( 11Ah = 660A for short term and 330A continuous).. Yes 330A!.. but the choice of these cells was not for their power, but for their large tolerance at low temperature and for long period storage and also their stable and safe chemistry. I'm using a 30A 4s BMS that equalize them and protect them.
    Yes, 40 cells that i sorted individually and carefully calculated to have 4 parallel groups of equal capacity and RI.

    I measured all individual cells one by one by cahrging them full to 100% SOC and discharged them with my CBA II computerized battery analyzer at 10C to get their Ah. Then i cahrged them to 50% soc and measured their RI with my Hioki 3550 Ri meter. Then i matched them with my optimization program tool on mathlab to match all cells in perfect uniform groups.

    These cells come from dewalt 18V LiFePO4 cordless power tool that i dissassembled. These pack are deffective and i just used the remaining good cells, wich is usually about 80% of good cells. These have about 2000cycles of life so this leave alot of good cycles from these slightly used deffective battery =)

    I am really familliar with lithium battery building in our electric bike forum I actually have one that does 113km/h at 125Vdc and 280A all built with some of these cells and few lipo.

    Doc
    Pangoline Quickshow FB3
    H-RGB1800 with DT40 and Laserwave OEM pro S modules (r637nm 190mWg532nm 710mWb447nm 850mW)
    Old set of G120 scanners and one Cambridge 6850
    1.4W 445 blue pointer

  7. #7
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    Quebec city
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    A quick video of the mod that i made



    Doc
    Last edited by Doctorbass; 02-03-2013 at 17:29.
    Pangoline Quickshow FB3
    H-RGB1800 with DT40 and Laserwave OEM pro S modules (r637nm 190mWg532nm 710mWb447nm 850mW)
    Old set of G120 scanners and one Cambridge 6850
    1.4W 445 blue pointer

  8. #8
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    Nice work !


    Do you have an idea of the autonomy of your assembly? I have a 2.5W laser and it consumes +- 70W so I guess the one you have is relatively equal. And laptop... probably 20W? (with its battery removed)

  9. #9
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    Quote Originally Posted by MIIKKKLLLL View Post
    Nice work !


    Do you have an idea of the autonomy of your assembly? I have a 2.5W laser and it consumes +- 70W so I guess the one you have is relatively equal. And laptop... probably 20W? (with its battery removed)


    The battery is 13.2V and 11Ah so it’s 145Wh energy max.

    I expect to have about 2-3 hours of autonomy.

    The laptop is consuming nearly the same power with or without the battery ( when the battery is already full).

    The galvo consumption vary a lot! They can jump from 10 watt to 100W ! depending on the amplitude and kind of wave they are modulating. The galvo consume more than the laser and peltier at full power once the temp is stabilized.

    Doc
    Pangoline Quickshow FB3
    H-RGB1800 with DT40 and Laserwave OEM pro S modules (r637nm 190mWg532nm 710mWb447nm 850mW)
    Old set of G120 scanners and one Cambridge 6850
    1.4W 445 blue pointer

  10. #10
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    Dec 2008
    Location
    Vezon, Belgium
    Posts
    1,017

    Default

    wouldn't it be better to use some DC-DC converters instead of a battery+inverter+step down converters? I see less heat and more efficiency in this route, no?

    anyways this is a beautiful build!

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