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Old 25th April 2012, 09:05 PM   #2141
SoIL4x4 is offline SoIL4x4  United States
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Quote:
Originally Posted by benb View Post
Engineers don't understand art. Or so I've been told.
Around here the line between artist and engineer blurs...you have to be a little of both.

Really cool amp by the way.
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Old 25th April 2012, 10:38 PM   #2142
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art is like poor grounding: I know it when I see it.

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Old 25th April 2012, 11:30 PM   #2143
koogar is offline koogar  United Kingdom
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Originally Posted by linuxworks View Post
I said this in another forum that your project appeared in: if it was mine, I would have gone to great lengths to ensure that its reverse voltage protected, over voltage protected and input/output protected as well. I think outputs are fairly protected on modern op-amps but they don't do well with reverse polarity or over-voltage. an onboard regulator or some circuit that shuts down on 'bad things' would have been a good idea.

it looks like a LOT of work to fabricate; and powering it on by mistake the wrong way would really ruin my year (lol).
I agree to a point but this is not a mass market item it was simply a D.I.Y one off concept.

The OPAMP has quite a wide voltage range up to 36V MAX in the amps current config as its split internally (+/-18v) , not that I would want to run it at anywhere those levels.So for my own use I didn't see any point with over voltage protection

Voltage reversal has a higher chance of killing it so i suppose I should have added some protection there.

There was no point in running it from anything other than one of the many manufactured switch mode power supplies I had in the 12-24v range all of which have positive center pins I don't think I have a single PSU that is negative center to use by mistake but it could happen.

I think I used a lab power supply once to show the +/- rail voltages in the article so I guess I could have blown it up there by swopping the polarity

I doubt it will even get much use as I have a lot better amps to use with my headphones.It was a fun project and saw it more of a conversation piece sat on the desk .

I am sure in this forum we all have more amps than we need or can use yet they all have a place in our minds.
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Old 26th April 2012, 12:26 AM   #2144
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an idea (too late, though): use a custom power connector and that can reduce the chances that you'll plug the wrong thing in.

anyway, I like the workmanship you put into it. I've done some air-wiring and its crushing when a part blows and you have to unbuild quite a bit to replace.
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Old 29th April 2012, 07:15 PM   #2145
SoIL4x4 is offline SoIL4x4  United States
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Default LM4780 dual mono

Audiosector LM 4780 pcbs standard BOM parallel/dual mono configuration
Antek an-3222 toroidal transformers with antek covers
Nichicon gold tune 6800uf power supply caps, 13,600uf per rail
Clarity caps MSA 4.7uf input caps
amb e27 colume control pcb
alps rk27 potentiometer
Cardass ACBP binding posts
Cardass CTFA rca's
Schurter MSM 19LA power switch
8audio volume knob, refinished to match brushed aluminum
Heatsink USA 6" x 6" heatsinks
walnut side panels cut from May 8, 2009 inland hurricane storm wood, tung oil finish
2024 aluminum parts cut and finished using hand tools and a drill press
total weight @43 lbs
Attached Images
File Type: jpg 1 LM4780 dual mono SoIL4x4.jpg (557.3 KB, 1571 views)
File Type: jpg 2 LM4780 dual mono SoIL4x4.jpg (743.9 KB, 1482 views)
File Type: jpg 3 LM4780 dual mono SoIL4x4.jpg (523.2 KB, 1379 views)
File Type: jpg 4 LM4780 dual mono SoIL4x4.jpg (559.7 KB, 1287 views)
File Type: jpg 5 LM4780 dual mono SoIL4x4.jpg (780.5 KB, 1170 views)
File Type: jpg 6 LM4780 dual mono SoIL4x4.jpg (605.1 KB, 726 views)
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Old 29th April 2012, 07:20 PM   #2146
SoIL4x4 is offline SoIL4x4  United States
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Default LM4780 dual mono

A few more.
Attached Images
File Type: jpg 7 LM4780 dual mono SoIL4x4.jpg (543.6 KB, 787 views)
File Type: jpg 8 LM4780 dual mono SoIL4x4.jpg (606.6 KB, 622 views)
File Type: jpg 9 LM4780 dual mono SoIL4x4.jpg (555.3 KB, 532 views)
File Type: jpg 10 LM4780 dual mono SoIL4x4.jpg (470.4 KB, 430 views)
File Type: jpg 11 LM4780 dual mono SoIL4x4.jpg (389.1 KB, 401 views)
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Old 29th April 2012, 07:30 PM   #2147
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mmm hmm that sure is purdy! very clean job. Do you have anything inside to light it up so everyone can see your craftsmanship?

Gotta love functional art!
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Old 29th April 2012, 08:40 PM   #2148
SoIL4x4 is offline SoIL4x4  United States
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Originally Posted by fabricated View Post
mmm hmm that sure is purdy! very clean job. Do you have anything inside to light it up so everyone can see your craftsmanship?

Gotta love functional art!
I could take some close ups of the interior if that is what you mean. Or if you are referring to the leds on the pcbs they are really dim. I wish they were brighter but I don't know if it is worth the trouble to swap out the resistors. They are in a tight spot.
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Old 29th April 2012, 10:19 PM   #2149
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well kinda..... i was wondering if you planned on adding "accent led lighting" on the inside since the top is acrylic..... figured it would be a neat way to show off your work.
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Old 29th April 2012, 10:31 PM   #2150
SoIL4x4 is offline SoIL4x4  United States
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Originally Posted by fabricated View Post
well kinda..... i was wondering if you planned on adding "accent led lighting" on the inside since the top is acrylic..... figured it would be a neat way to show off your work.
Hmm. I don't know. That would be kind of cool, I would definatly have to change that resistor though, and maybe a different color led (they are green now). I do remember seeing on here somewhere that someone used fiber optic cable and some craft wire to make light pipes that was pretty cool, I don't know if it would look right inside my amp but it would look cool in the dark. Like looking down at a stage. Hmmmm....
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