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Old 20th September 2013, 04:38 PM   #1
mortron is offline mortron  Canada
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Default Repurposed enclosures and more...

So I am looking into chassis materials for a project and my interest in repurposed materials has me wondering what abundant products can be repurposed into enclosures etc. Some members have used RC car heatsinks in amps and others use cigar boxes to house amps... I used a poop shaped tin to house a line level crossover. What are you employing? Or what's on your wish list? Computer cases always interested me as being useful, and have to admit a desire to find a G5 Mac computer case to repurpose. Anyone tried these?
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Old 20th September 2013, 10:43 PM   #2
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I do organ generator preamp power supplies in a PCAT power supply case. Comes with an IEC socket, an on-off switch, and the toriod RF filter, MOS spike supressor.
I do amps in Stainless Steel motor drive boxes from food machines. They have a 6x10x1.5 ribbed heat sink on the back. They have an on-off switch, and three conduit holes in the back.
Up to now, I've sawed up PC computer cases to make mount strips for load resistors (5 ohms x 225 watts) for amp testing. I bend up tabs on the end and insert them in the logs. This keeps the resistor from burning the coffee table I use for amp repair.
I have also cut the fan grill out to put over salvage PCAT fans on an amp that needs cooling to not melt the solder. I have two fans like mouse ears around an existing amp (ST120) that had a heat sink that just barely met the FCC spec for the rated watts.
Even plastic cased motor VF motor drives have nice aluminum heat sinks. Also nice industrial quality 470 uf 400 WVDC electrolytic caps. All except the CDE flat pack caps in the SS motor drive cases discussed above. Those semi brand motor drives were known for the caps leaking out the fluid and blowing the fuse at three to four years life. Siemens AllenBradley motor drives and TB Woods motor drives have caps in them that are high temperature resistant and run 10-12 years if cleaning water doesn't kill them by leaking in and blowing the SCR's.
The MOS surge surpressors in VF motor drives I have been installing on the input of all the old amps I have bought. Tube (valve) organs are lightning resistant, but transistor amps are not. The ones out of motor drives are 500 v rated, but they have a huge energy capacity, and are probably much more likely to supress a lightning strike at below the wire resistance (600 v) than the "150 VAC" 7 mm surge supressors found in consumer equipment. The joule rating of industrial supressors are much higher.
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Old 26th September 2013, 05:16 AM   #3
dangus is offline dangus  Canada
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A friend saved me an extruded housing for a control module from a small excavator. It has places for self-tapping mounting screws to attach end covers, and grooves for mounting a PC board. There's a ridge on the top that needs to go, and flanges which would be useful for mounting in an autosound situation, but would otherwise get in the way.

I've considered reusing the 19" 1U rack cases from obsolete ethernet hubs or other IT hardware. You might be able to find those cheap at computer recyclers.

The extruded aluminum cases from old analog modems could be useful, but I haven't seen one of those in a long time.

Computer UPS cases might work for monoblock power amps. They're built to handle the weight of a transformer and battery.

Obsolete car audio tech like CD changer housings, or underdash 8-track players could be useful for mounting car computers.
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Old 26th September 2013, 05:37 AM   #4
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Quote:
Originally Posted by dangus View Post
underdash 8-track players could be useful for mounting car computers.
My early years of DIY! I've still in mind how a 2W amp + head amp on a 2 X 4"
PCB made my 3 way Infinity sing! I had adapted my Aiwa walkman mechanic
YES ! The autoreverse switch definitively switched the 2 of 4 coils in the head - while inverting motor rotation verse.
Long live analog
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Old 28th September 2013, 02:13 AM   #5
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UPVC window ledges are good for out door circuits as they do not fade in the sun. The housing for a cat dig up stopper for seedling beds was built this way and has lasted.
A soda bottle was used for a later version of this unit and both are working very well.
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Old 28th September 2013, 03:11 AM   #6
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Quote:
Originally Posted by mortron View Post
... a desire to find a G5 Mac computer case to repurpose. Anyone tried these?
I haven't actually used one yet, but i plan to. I have at least 3 of them.

dave
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Old 28th September 2013, 03:14 AM   #7
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The extruded aluminum cases from old analog modems could be useful
I just sent a half-dozen of those to the recycle.

dave
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Old 28th September 2013, 03:17 AM   #8
imix500 is offline imix500  United States
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My F5T is built into one if I ever finish it. The cases are stupid cheap and are quite well made for such things.
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Old 28th September 2013, 03:23 AM   #9
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The topic runs the gamut from Altoids tins to military surplus ammo boxes. I just save whatever I come across that has DIY repurposing potential.
Old cable/satellite TV settop boxes seem to be fairly easy to obtain and would make a good preamp or smaller power amp enclosure.
Cassette decks could be gutted and a new faceplate added for larger amps.
I'm not an Apple guy, but PC cases always seemed to need too much metalwork modification to make them practical to me.
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Old 2nd October 2013, 12:43 AM   #10
neela30 is offline neela30  United States
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I was thinking of doing a similar project with a car audio amplifier board I snagged off of ebay. I've considered using a computer case, ammo can, metal tool box etc but can't quite iron out all the problems associated with the transistor cooling and support.
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