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Build process - sharp inspired 3d printed ghettoblaster (half size)

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  • 3rutu5
    replied
    After a nice weekend away I decided to finish off the day by assembling this one for my mate. Interesting to note that i played around with the DSP on the board with this one and installed a Bass Shelf filter of about 2Db's from the 150hz range and also dropped the entire master by -2db's as well to stop and saturation of the signal. So guess what would people want to know, how does it sound? well to my ears against my white one it seems to have more slightly more bass, just looks to hit a little harder and without distortion (like my other). I dont think it has an issue with the cone excursion as we are talking 5watts per channel on a 6.5v system, but to me seems to be the perfect matched amplifier for the DMA-45's. This is purely my opinion as i have a tendenacy to push the limits of the builds and after testing a dozen 12v and 5v amp chips i'm very impressed by the QCC range over the CSR BT chips, only issues being that a QCC3003 and 3005 chips seem to be on the way out and might be harder to find and modify.
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  • 3rutu5
    replied
    I've decided not to push a good thing and instead make one for a mate. It is pretty similar but I've changed the back end a little to have tapers to avoid the rough surface from the supports and it seemed to work a treat.

    The amp chip that came was different but I can still access it via my computer and give it a bass shelf filter though the DSP.

    He wanted an all black one, which most looks good but even though the filament is matte I feel like there is some artifacts when the light hits it in the right light.
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  • 3rutu5
    commented on 's reply
    I reckon the battery drained. I might have got longer if I didn't go 4 LEDs possibly. I put it back on charge and it started going again.

    I really liked the cosmetics look of the LEDs shining through the PLA so in the case sensibility was left out and the common ground was having a 10-11hour run time. A thought was to use a momentary/tactile switch to toggle on the lights on demand. Maybe if I ever rebuild this one I'll look at that with some battery indicator/voltage meter etc

  • djg
    commented on 's reply
    You mean the battery was drained or the electronics broke?

  • 3rutu5
    replied
    Sadly it lasted 11 hours of continuous play until it turned off. Still very happy with that

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  • Paul Carmody
    replied
    So cute!!!

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  • 3rutu5
    replied
    Loving it so far, expoxied on the panels and siliconed up some gaps around the usb c and switch. Ran it non stop today for 9h30mins and it is still going strong, hit pause on the stop watch and will continue all day again tomorrow. I'm thinking is the 18350 1100ma battery gave me around 7-8 hours of run time that a 3000Ma 18650, even with those 4 LED bulbs going will give me around 18-22 hours, maybe more.

    Was thinking about the advice on the bass shelf for the DMA45-8 and if i should try it with this or just let it be, just the risk of it distorting or not being as good...who knows to be honest.

    Fun little project would consider doing again in the larger scale, but as mentioned before, if you have a 3d printer and want a go, just shout out.

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  • 3rutu5
    replied
    Only other thing i was thinking was to drill a small hole in the back and put in an antenna, purely cosmetic, but had a small one lying around.

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  • 3rutu5
    replied
    All wired up and ready to go, I wont expoxy the body together yet until i'm a 100% happy with how it all works as it is easy to fiddle around the internals with the front off. But let me just say, tried the no weight option, then added 2g's (some washers i had int he garage), but it on with blue tack and i could notice the slight extra punch, not heaps but noticeble. Im tempted to go 4g's and see what that does, just didnt look that nice on the graph. So...whats different? i wired up 4 LED's in parallel, each with their own resistor just off the switch and put 3 behind the "power bar" (on the Actual gf 6565) and it looks pretty cool, the other one was hidden and i'm sort of bummed that i forgot to design the visible bulb and have it light up, but it does come through the PLA plastic quite well when on.

    The 3mm magnets also make mounting the grills really easy and im glad i did it, just wish i had a time machine to go back over a year to do the same on the phantom clone.

    Now the sounds, i was running tests with like for like setups, where the unit to the left was the other small DMA45-4 build i did, running a similar amp, battery and boost setup. The only real differences was the 2 drivers shared the same enclosure, maybe 15-20% smaller and i went with some random pairings of passive membranes and DMA58-PRs (difficult to model). So yes the new one completely smashes it out of the park.....If i was compairing WiniSD charts (albeit not being able to accurately modell an extra 4 passive membranes), the F3 on the new one is around 92Hz (F0 100hz, F6 87hz, F10 82hz), where the other was (F0 400hz, F3 180hz F6 123hz, F10 94hz). The other noticable difference was the left unit used a 18350 1200ma battery, where the right one has a 18650 3000ma and assuming the LED's dont actually draw that much each 20ma, that the new one should exceed the 8 hour run time the previous did.

    Great other little feature, this all gets charged off a usb c jack, so any new phone chargers and power banks can be used.

    Final thoughts? i really quite like it, could i have done one with a 12v system? possibly, could i have gone 2 sealed chambers and put a tang band 2.5 sub on the back? maybe.....but i might have an issue putting it all in a tiny space. Do i like it, YES i do really like it, just wish the print in places with the smaller detail was a little crisper, but having an approximately 40 hour print to do it all is enough for me, less than a roll as well. I'll post a youtube video so people can hear how it actually sounds.
    Attached Files

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  • tomzarbo
    replied
    Man, something inside me just thinks this is so cool. Keep going!

    TomZ

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  • 3rutu5
    replied
    Getting a little closer, had some fun with some small 3mm magnets to have the grill attach that what....don't know If it will cause any issue with the hardware, but don't think it will.

    Did a.little soldering as well and it looks to be working but didn't attach the speakers yet as I misplaced the crimped terminal connectors. The problem I'm having with the dma45's is the soldering iron gets hot and.the plastic housing works its way loose (on the driver)

    Also put the handle on might need some. loctite to stop the bolt coming off.

    Most likely.do a.test run tomorrow and hot glue some areas an epoxy the shells together.
    ​​​​​​
    Attached Files

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  • 3rutu5
    replied
    Originally posted by djg View Post
    Well, even if your posting is a bit disorganized, your work is very nice. Hope to see this completed and hopefully painted to mimic the original.

    I'm stuck in wood, table saw and router land.
    I think after the first attempt that I may pass on the painting, the photos don't do it justice and looks ok straight off the printer. Maybe a splash of colour across the face, who knows but I do know sanding would be a pain with all the small details.

    Nothing wrong with timber, been using my wooden boomboxes lately as well and love that sound.

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  • djg
    replied
    Well, even if your posting is a bit disorganized, your work is very nice. Hope to see this completed and hopefully painted to mimic the original.

    I'm stuck in wood, table saw and router land.

    Leave a comment:


  • 3rutu5
    replied
    Some random CAD view and some others
    almost got.a 26650 in there but just a few mm's too much....now I can position the tp4057 on the back of the battery mount and the USB c jack just below it, might be able to glue the step up module there as well for some good cable management
    Attached Files

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  • 3rutu5
    replied
    old posts - applogies for the scatter gun approach previously

    https://techtalk.parts-express.com/f...ted-mini-sharp

    https://techtalk.parts-express.com/f...ers-any-poin-t

    https://techtalk.parts-express.com/f...cs-help-needed

    https://techtalk.parts-express.com/f...red-sharp-mini

    https://techtalk.parts-express.com/f...-with-anything

    https://techtalk.parts-express.com/f...ig-peerless-pr

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