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IndestructibleGhettoblaster

This version was saved 18 years, 6 months ago View current version     Page history
Saved by PBworks
on September 29, 2005 at 7:20:46 pm
 

The indestructible ghetto blaster hack started off when I found a remote 1960-70 Closed Curcuit Television Monitoring station at the local dump. I gutted the insides except for the faceplate and stuck in the gurage. About 6 months later, and right after I had finished the Back Pack Sound Hack, I had the inspiration to transform it into a sturdy and loud ghetto blaster.

 

The case is made out of welded aluminum and has an aluminum covering that latches on with 4 strong overcenter hinges. The original face plate inside the case was designed to be taken off if nessescary by unscrewing four cool hing mechinisms (looks like a screw with a smatt pice of metal attacked to the face plate, as you unscrew it, the metal piece retracts from underneath a lip in the case. Also two metal handles were attached to the face plate to lift it out of the interior of the box.

 

 

I started by removeing key pieces of the face plate then I created two new faceplates out of 1/4" hardboard, one went undeneath the speakers and was screwed to them and the top one went above the speakers (two at 2", one at 4"' two at 5", and one at 8") both were held together using longer screws.

 

After adding the speakers to the new faceplate, I wired everything in mono coming from the out put on the donor amp. The reason for this was to facilitate the addition of the toggle switches to be added later and it wasn't completly nessescary to have a left and a right channel of sound in such close proximity (I did the same on the back pack). It also didn't matter because the secondary output from the amp would be in Stereo, so it would be possible to have an external stereo system.

After finishing the basic faceplate part, I drilled the holes for the potentiometers in the thick guage aluminium (I found that to effectivly have the 3/8" twist bit not walk all over the top of the case you must first center punch all of the holes) After drilling the holes for the knobs I located the correct position for the power button and two microphone inputs and drilled these. Next I layed out the location of the paths for the 5 sliders on the equalizer. I drilled the top and bottom of each of the little rectangles and then cut the waste in between them out with a cut off wheel in the flexi-shaft of my dremel tool. The result was very professional looking. I then drilled tho hole for the power indicating LED (the little red dot in between the equalizer and the small brass plate in the picture above). Finally I drilled the hole for the input to the ghetto blaster. (more to come on this later)

 

[http://www.flickr.com/photos/90875999@N00/47843542/]

 

I now attached the curcuit board directly to the bottom of the case and with a little more patience and work, the whole thing was functional. However, it did not look nearly as cool as I had hoped. So I fixed that problem.

 

 

I added a false bottom to the case by cutting out a template of the inside of the case from paper. I accounted for the nessescary hole for the input, which ath the moment was still inside the box! (notice the black plate with the stereo connections. This was the input, Output, and DC input from an AC?DC convertor.)

 

Because of the aluminum front cover there was no need to add screens to the front of the speaked because as it is being moved, its most vulnerable time, the cover is on it and nothing can hurt it. For two days straight I worked feverishly on it to get ready to pump out music for the first mile time trial for cross country. I managed to get to the practice on my bike in time but it ended up raining during the trial, so we didn't have music to run to. Also the indestructable ghetto blaster is good because of its box shape which reflect the sound outwards unlike the Back Pack Blaster which inherently does not as good acoustic properties.

 

 

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