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Chip Amps Amplifiers based on integrated circuits

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Old 1st January 2013, 07:39 PM   #2321
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Nice case, smart solution!
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Old 1st January 2013, 08:13 PM   #2322
JMFahey is offline JMFahey  Argentina
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Congratulations.
Cool build
I use TDA2005 for my "Street" Guitar/Mic amplifiers with excellent results.
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Old 1st January 2013, 09:04 PM   #2323
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Default 3886 Quad power amp

I built this last year and am very happy with it. I just wish I'd built two of them, so I could have the 7 channels I need for my stereo holographic soundbar project that I'm doing now. Sorry no front shot. The front has a power switch, a power on LED, and a window with the four peak level indicators (7 LEDs per channel) behind it. 65 watts into 8 ohms is generally enough for me, although I do use Hafler DH220's (125 watts/ch.) on the woofers which are active EQ'd to be acoustically flat at the couch to 20HZ).

Oops, this shot is not the one I thought it was... Here it is half built anyway.
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Old 1st January 2013, 09:26 PM   #2324
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Osscar:neat.
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Old 1st January 2013, 10:08 PM   #2325
WesleyK is offline WesleyK  Netherlands
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Osscar,
Where did you get that enclosure? Very neat
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Old 7th January 2013, 07:41 AM   #2326
weslito is offline weslito  United Kingdom
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Nice job! Where did the enclosure come from? I've been looking for some nice two part extruded enclosures, without much luck.
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Originally Posted by osscar View Post
small garage/workshop amp (for mobile phone, mp3 player etc) from salvaged and used parts only: TDA 2005M in BLT mode with high gain from datasheet circuit ; p2p; any AUX PSU 9-18V
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Old 7th January 2013, 07:42 AM   #2327
weslito is offline weslito  United Kingdom
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Oh... I didn't see the post above mine. Now you have two Wesley's asking the same question.
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Old 7th January 2013, 08:12 AM   #2328
osscar is offline osscar  Latvia
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tnx, tray this link (there are many different sizes of these "project Boxes":

diy project box in Business & Industrial | eBay
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Old 7th January 2013, 09:25 PM   #2329
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My box is just a Hammond chassis with heat sinks that a friend of mine had laying around. I think the Hammond part is 3 X 12 X 10 aluminum. Steel chassis may shield better but are much harder for me to fabricate.
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Old 10th January 2013, 04:38 AM   #2330
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Talking TPA1517 amp

Here are some photos of my first chip amp, which I completed yesterday. It's a cheap and cheerful TPA1517 amp, powered from a 12VAC wall wart. I am using it with some cheap bookshelf speakers I picked up from a thrift store for $7.50. Obviously neither the amp nor speakers are hi fi, but they actually sound quite good to my ears, especially when you consider the overall price of the system. Certainly a huge step up from laptop speakers!

Nothing too pretty or interesting to look at, except perhaps for my improvised heatsink. Pins 10-20 of the TPA1517 (i.e. one whole row of the chip) are heatsink pins. The idea is that if you are etching a PCB for this chip you connect these pins to a big copper plane to act as a heatsink. Since I was using protoboard and not my own PCB, this wasn't an option for me. So I took some heavy guage copper wire, like what they use for house wiring, and bent it into an elaborate little miniature radiator shape, and soldered part of it all along the relevant side of the chip, as you can see in the photos. There's also some more of that wire on the underside of the board. This system seems to be working well enough. The chip doesn't get that hot in the first place.

I highly recommend the TPA1517 as a very simple project for beginners. It runs from a single-sided supply, requires the bare minimum of external components, has the gain internally set to a sensible level (20db) and puts out more than enough power for sensitive speakers (6W per channel into 4 ohm), and sounds pretty good. Should be far more rewarding than two LM386 chips for about the same complexity.
Attached Images
File Type: jpg closed_front.JPG (142.2 KB, 1109 views)
File Type: jpg closed_side.JPG (122.4 KB, 942 views)
File Type: jpg open_front.JPG (140.6 KB, 903 views)
File Type: jpg open_top.JPG (175.5 KB, 886 views)
File Type: jpg closeup1.JPG (170.1 KB, 383 views)
File Type: jpg closeup2.JPG (219.0 KB, 321 views)
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