Contest: Linear Power Amp in a mint tin (class Aa, class AB, or class B) - Page 19 - diyAudio
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Old 3rd January 2013, 05:25 PM   #181
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Most likely TDA2030/LM1875
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Old 3rd January 2013, 10:11 PM   #182
JMFahey is offline JMFahey  Argentina
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Quote:
Mint tin, Office Depot, Walgreens, have the old fashioned size mint tins like mine that will even fit an STK chip, as shown in post #6.
Thanks, but I'm in Buenos Aires, some 8000 miles away
Problem is, up to a short time ago dollar/toy shops were full of nice tin cases in all sizes and shapes (printed with Barbie/Hello Kitty/etc. graphics for young girls), now I can't find them anywhere, shop owners inform me "they are out of fashion" and try to sell me the current (plastic) ones.
So far I have secured 3 tin cans which approximately fit the specs:
1) a round tin ashtray, 3 3/4" diameter by 1 1/2" high. Of course it has a round cover
2) a rectangular tin (Winnie the Pooh graphics) pencil case, 8" x 2 1/4" x 3/4" (if no better found, I'll use this one)
3) a sardine can, emptied by yours truly, 2 1/2" x 4 1/4" x 1" which also looks promising.
It does not have a cover, of course, which was cut away with a tin can opener , but I can fashion one out of some aluminum sheet.
Which is good because it's a better heatsink than paper thin tin.
Well, if by the end of the week I don't get a better one, I'll use one of these.
Stay tuned
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Old 3rd January 2013, 10:41 PM   #183
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These are car air fresheners:
Click the image to open in full size.Click the image to open in full size.
Maybe they're at the auto parts store or that sort of department in a larger store?
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Old 3rd January 2013, 11:02 PM   #184
JMFahey is offline JMFahey  Argentina
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I'll check.
So far my favorite is the pencil box, just checked my standard 2200uFx50V radials fit very well , I think 4700x25 are about same size, so I might either make a monoblock LM3886 40/50W amp or stereo 2 x TDA2050 .
I might even fit a flat CPU fan inside , for forced cooling.
This is slowly taking form in my mind.
Just don't want to rush until I have the physical space defined.
The actual electronics part is a piece of cake.

PS:you hit the nail right in the head, with the "Hello Kitty" can
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Old 3rd January 2013, 11:21 PM   #185
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So how much does it cost to send the poor guy and Altoids can?
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Old 3rd January 2013, 11:27 PM   #186
JMFahey is offline JMFahey  Argentina
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Probably much more than the project is worth
Don't worry, I haven't been yet to Downtown.
Where I'll probably buy an actual Altoids (o Cadbury/Riggs or any other) can, and empty its contents .... although my Doctor will frown on that.
Don't worry, we're almost there.
This is for Fun, anyway
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Old 3rd January 2013, 11:38 PM   #187
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You hit it on the head, go to one of the high end candy stores and they will usually have tins of sours or fruit flavored hard candy. It seemed that for awhile you couldn't go anywhere and not see an Altoids tin of some sort of strong mint.
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Old 4th January 2013, 09:38 AM   #188
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Originally Posted by Kindhornman View Post
So how much does it cost to send the poor guy and Altoids can?
Probably $3 airmail from the US if its empty
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Old 4th January 2013, 10:44 AM   #189
JMFahey is offline JMFahey  Argentina
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Hey !! , why *empty*???
You sound like my Doc/wife/daughter
Anyway, don't worry, I've settled on the Winnie the Pooh pencil box, being rectangular but most important, flat bottomed, allows me to pop rivet an aluminum rectangle as heat sink, thermally coupled with some grease.
Now, where did I put those TDA2050?
I'll build it this weekend.
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Old 4th January 2013, 12:24 PM   #190
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Quote:
Originally Posted by JMFahey View Post
I'll check. So far my favorite is the pencil box, just checked my standard 2200uFx50V radials fit very well , I think 4700x25 are about same size, so I might either make a monoblock LM3886 40/50W amp or stereo 2 x TDA2050. I might even fit a flat CPU fan inside, for forced cooling.
This is slowly taking form in my mind. Just don't want to rush until I have the physical space defined. The actual electronics part is a piece of cake.
I've got some ideas for you.
With a discrete amp possibly in the lead at the moment, you might want to get a bit competitive with a "made for compact stereo" chip amp. That compact stereo class of chip amplifiers feature generally cooler running and audibly level harmonic response that makes component selection and fidelity much easier to do.

The monobloc option is either a parallel amp or has parallel output devices (same number of output devices and same minimum total system power as the stereo build).

Instead of a fan demonstrating that inefficiency has required forced air cooling, you might consider a cool running amplifier, feet on the bottom of the enclosure, passive intake vents through the bottom of the enclosure (vents underneath caps and also vents at heatsink/spreader materials), and passive output vents at near the top of the enclosure. It is also possible to use metal feet with a bit of rubber on the bottom.

Good power and other filtering and compensations all to restrict the amplifier to "only audio work" can make it run quite cool by increasing the efficiency of its primary task, which is only audio. Datasheets list some "optional" rf filtering and you can check to see what will make your amp run cooler. This is a linear amplifier efficiency contest.
Quote:
Originally Posted by JMFahey View Post
You hit the nail right in the head, with the "Hello Kitty" can
Would be so very surprising for Hello Kitty mint tin amp to output exuberant hi-fi. Really fun to show it to friends and neighbors just to see their expressions.
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Last edited by danielwritesbac; 4th January 2013 at 12:33 PM.
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