Another DL project...

avionic · Dec 4, 2009

Last night at work.Things were a little slow.I had just recieved two more Arcol 300 watt 8 ohm resistors and was looking for some scrap aluminum for a heatsink. Went out to the scrap metal dumpster.At first glance all I saw was iron and stainless,no aluminum...But buried down in the bottom of the bin was a decomissioned 150 HP 3-phase Allen-Bradley freq.drive..:scratch2: Now that is bound to have a heatsink in it.:scratch2: Dug that sucker out of the bin and drug it back to the machine shop. Field stripped it and...."Jackpot" :banana:

Drilled and bottom tapped it for 1/4-20 x 1/2" hex cap screws..

golana · Dec 4, 2009

nice find. May I ask what DL is?
Or, what the project might be?

Jailtime · Dec 4, 2009

golana said:
nice find. May I ask what DL is?
Or, what the project might be?

Dummy load. Mount those serious resistors to the big heatsink, and you now have a device that provides a load when testing an amplifier's output. I bet this one would heat a room nicely when it's dissipating around 600 watts.

golana · Dec 4, 2009

Ahh, I see.

avionic · Dec 4, 2009

I have just increased my load capacity to 1800 watts @ 2 ohm..

http://www.audiokarma.org/forums/showpost.php?p=3208444&postcount=80

Jailtime · Dec 4, 2009

avionic said:
I have just increased my load capacity to 1800 watts @ 2 ohm..
http://www.audiokarma.org/forums/showpost.php?p=3208444&postcount=80

Do you still have the big Yamaha amp to give her a run at 4 ohms?

avionic · Dec 4, 2009

Jailtime said:
Do you still have the big Yamaha amp to give her a run at 4 ohms?

Yes..It has a little problem in the buffer circuit. Mark B has a PC5002M he wants to load check with 2 ohm.---Fire extinguisher will be close at hand.

specialidiot · Dec 4, 2009

I've been looking for a chunk like that for a 2nd F5.......

avionic · Dec 4, 2009

specialidiot said:
I've been looking for a chunk like that for a 2nd F5.......

If the fins were running widthwise rather than lengthwise it would make a great amplifier heatsink.

specialidiot · Dec 4, 2009

avionic said:
If the fins were running widthwise rather than lengthwise it would make a great amplifier heatsink.

I could make it look like a Zen amp....

djnagle · Dec 4, 2009

avionic said:
If the fins were running widthwise rather than lengthwise it would make a great amplifier heatsink.

Wouldn't need to do that, just place it across the top of the amp and attach both bit to it.

avionic · Dec 4, 2009

Add a little thermal compound and torque down the fasteners.

avionic · Dec 4, 2009

djnagle said:
Wouldn't need to do that, just place it across the top of the amp and attach both bit to it.

IMO that would look pretty tacky..But to each his own.

jsarsfield · Dec 4, 2009

avionic said:
I have just increased my load capacity to 1800 watts @ 2 ohm..
http://www.audiokarma.org/forums/showpost.php?p=3208444&postcount=80

You deviant

JonL · Dec 4, 2009

That variable frequency drive probably also have six or so electrolytic capacitors the size of a Foster's beer can in them. Maybe make a huge power supply with them.

cdfac · Dec 4, 2009

avionic said:
Yes..It has a little problem in the buffer circuit.

so you've narrowed it down?

avionic said:
Mark B has a PC5002M he wants to load check with 2 ohm.---Fire extinguisher will be close at hand.

THAT will be interesting :smoke:

avionic · Dec 4, 2009

JonL said:
That variable frequency drive probably also have six or so electrolytic capacitors the size of a Foster's beer can in them. Maybe make a huge power supply with them.

Sure did and SCR's the size of a pack of cigarettes.Thats what was mounted on the heatsink.Threw all that back in the dumpster..I was only looking for the heatsink.

Mark B · Dec 5, 2009

Looking good! Now to get my amp down to you.

avionic · Dec 5, 2009

Mark B said:
Looking good! Now to get my amp down to you.

:scratch2: Road Trip!!

gonner · Dec 6, 2009

avionic, I would gladly pay for you to regularly throw whatevers left over from your dumpster in a box and ship it to me,,

Another DL project...

" Black Knights " F-15 back shop EW avionics

Attachments

analog

Standin' on a corner

analog

" Black Knights " F-15 back shop EW avionics

Standin' on a corner

" Black Knights " F-15 back shop EW avionics

Break Glass, Smoke Lucky

" Black Knights " F-15 back shop EW avionics

Break Glass, Smoke Lucky

AK Subscriber

" Black Knights " F-15 back shop EW avionics

Attachments

" Black Knights " F-15 back shop EW avionics

The Pioneer Pirate

Lunatic Member

AK Subscriber

" Black Knights " F-15 back shop EW avionics

Yamaha Fan

" Black Knights " F-15 back shop EW avionics

PACKRAT