1. Who’s Down to Make This Monster LEGO Boombox (a/k/a “LEGOBLASTER”)?

    Given the fact that LEGO is as popular as it’s ever been, we’re pretty certain there were a whole lotta bricks under the tree this Xmas worldwide. But who out there is up to the challenge of attempting to assemble the LEGO ghetto blaster boombox – a/k/a LEGOBLASTER . The brainchild of one “cosmicxanadu” – who’s supplied computer renderings and accompanying commentary of his vision – this 6600-brick monster features radio, cassette, CD player, motorized/functional components, and internals so detailed (down to the cassettes, cassette drive mechanisms and even a battery compartment) you can practically feel the bass in your face as you study its blueprint. It may take you a while to complete, though. And if ya don’t know, now ya now, Ninjago.


    For even more geeky details and specs check out My LEGO Stuff


    “This 1980s style ghettoblaster uses 6631 bricks and includes an AM/FM radio with working tuning knob & waveband pointer, a motorised front tray-loading CD player, a motorised cassette recorder with working soft-eject, 4 speakers, 2 microphones, a graphic equaliser with LED bargraphs, front and rear connections, battery compartment, aerial, and a carry-handle.

    The front of the unit contains the controls, all of which can be operated. These include; vertical linear sliders, vertical two-position slide switches, rotary knobs (one of which moves the radio tuning pointer), and spring-loaded pushbuttons (one of which operates the cassette ejection system).”


    “The top of the unit has a carry-handle that can be folded down, and an aerial that can be extended and positioned in 2 axes. The side of the unit includes finger grips so the unit can be lifted easily when the aerial is in the extended position and the carry-handle in the folded down position (you can’t change the position of the carry-handle whilst the aerial is extended). The side also has vents, and there’s additional vents on the rear too.”

    Front detailing.

    “On the front of the unit next to the main speakers there are two internal microphones, connectors for external microphone & headphones, and a 3-digit tape counter with spring-loaded pushbutton reset (the digits don’t rotate or anything, to do so would have made it too bulky).”

    CD Player.

    “The CD player includes a motorised front tray-loading system, motorised head positioning, and motorised spinning of the CD. There’s also six spring-loaded front-panel pushbuttons representing the functions; play, stop, pause, next track, previous track, and eject.”

    Cassette Recorder.

    “The cassette recorder includes motorised gearing to the drive spindles for playback, fast-forward, rewind, and even raises the heads and pinch-roller up to the cassette on playback. There’s also six spring-loaded front-panel pushbuttons representing the functions; record, play, stop, rewind, fast-forward, and eject – which actually opens the front-loading cassette drawer using a soft-eject system controlled by a damped shock absorber.”

    Cassette Mechanism.

    “The cassette is inserted to the front drawer and guided down between some slopes to initially rest on two tiles at the bottom of the drawer. Pushing the drawer closed causes the cassette guides (two grey curved slopes sticking out from the back wall) to raise the cassette slightly allowing the capstan and drive spindles to stay properly aligned with the holes in the cassette as the drawer closes.”


    “The carry-handle folds down partially into the recess in the top of the case. It contains Technic Axle rods for strength, although I’d still recommend lifting carefully with two hands. The aerial is built from two of the longest Technic Axles covered with Technic Ribbed Hose and contains a series of Hinge Arms that allow it to unfold in the middle, elevate, and rotate. It folds because I couldn’t see a good way to do a telescopic aerial on this scale.”

    Rear panel.

    “The rear connection panel includes stereo phonos for Line-In and Line-Out, along with an external power socket. The batteries in the battery compartment are loosely inserted and held in place by a hinged cover with two blue thumbscrews that rotate behind the outer case to hold the cover in the closed position.”

    Internal components.

    “Rear cover removed showing the internals, including a long circuit board that continues behind the battery compartment and has the rear connector panel mounted onto it. The carry-handle supports extend all the way down into the base of the unit for maximum strength so that when you lift it by the handle you are actually lifting it from the base.”

    Cassette construction.

    “The cassette is only very slightly larger than the real thing. Every connection is completely legitimate but the strength is a little on the weak side with only a single stud holding some sections together. A stronger more detailed version is possible, but it becomes too large and would affect the size of the cassette deck. “

    Radio Tuner.

    “The AM/FM radio features a functional tuning knob that when turned drives a Technic Chain Link mechanism that moves the waveband pointer left and right until it hits the end-stops. If you’re under the age of 25 you may not have seen this before but that’s roughly how analogue radio tuners used to work, albeit the chain link was usually one or more rubber belts & pulleys that if you dismantled you had practically no chance of putting back together again!”


    “The big bad bass loudspeakers. They’re pretty big – just two of these and a single cd/cassette deck with minimal surround have taken the width of the overall unit to over 64cm, which is pretty big for a ghettoblaster.”


    “The equaliser sliders are implemented with a forward-facing tile sliding up and down a fixed rearward-facing tile. The sliding part then has a shock absorber brick with the spring pushing the slider into the front of the unit so that the movement is stiffened and the slider doesn’t fall out of position due to gravity. The rear cover is removed on the lower image so you can see the shock absorber assemblies.”

    Battery compartment.

    “The battery compartment houses 6 D-cells. They are not attached, they just sit in the holder and are held in place by closing the outer case cover just like on a real ghettoblaster. However, the stud on the tip of the battery does mean you need to slide a whole row of three in together at the same time.”

    CAD modeling.

    “CAD screenshot showing the full model.”

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