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Chip Amps Amplifiers based on integrated circuits

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Old 29th July 2011, 11:48 AM   #1861
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That power supply sure looks big enough to power the amps!!!
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Old 29th July 2011, 03:46 PM   #1862
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Nice enclosures apoopoo999. How are they made? I assume the front is custom laser cut, but what about the sides? Are they some sort of box section aluminium?
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Old 29th July 2011, 06:36 PM   #1863
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Quote:
Originally Posted by portreathbeach View Post
Nice enclosures apoopoo999. How are they made? I assume the front is custom laser cut, but what about the sides? Are they some sort of box section aluminium?

The sides are made from 3" x 3/4" thick aluminum made by 8020

8020 T Slot Aluminum Extrusion 15 S 3034 L x 48 N - eBay (item 370155124158 end time Aug-24-11 08:18:41 PDT)
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Old 29th July 2011, 08:31 PM   #1864
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Quote:
Originally Posted by AndrewT View Post
Who tells us the PSU is not bigger than the amplifier?
Here's an excellent example showing that the PSU must not be skimped.
Totally agree!

Great design as well. I like it, well done!
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Old 3rd August 2011, 06:25 PM   #1865
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Default LM1875 btl

this is my first amp project, it was ugly, full of frustration and pain, of course gain at last, anyway share with you guys.
Attached Images
File Type: jpg P1000745.jpg (496.1 KB, 1699 views)
File Type: jpg P1000747.jpg (466.1 KB, 1624 views)
File Type: jpg P1000749.jpg (386.0 KB, 1497 views)
File Type: jpg P1000750.jpg (447.3 KB, 1389 views)
File Type: jpg P1000751.jpg (469.9 KB, 1345 views)
File Type: jpg P1000753.jpg (457.5 KB, 590 views)
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Old 8th August 2011, 06:12 AM   #1866
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Default Hacked It!!!

For the second time in about 30 years, working with the LM383 / TDA2003 line of "car radio" amplifier chip amps, I came up with one that was stable, no oscillation!!! The first time I had a stable amp and did not know why and also didn't document that circuit, in the early 90's. Raymond Haigh's explanations and circuit board art gave me all the insight I needed to identify and correct all of my grounding issues. I ended up using 3 grounding systems in my amp, one for the DC power and speaker RC network grounds, one for the feedback components grounding, and one for the input ground on each chip, when I translated to perf-board!

Raymond Haigh on chip amps: http://www.transkommunikation.ch/dat...rst%E4rker.pdf

2 X TDA2003 amp, about 10 Watts RMS, onset of clipping
into 4 ohms, 13.8 VDC powered.
Attached Images
File Type: jpg Deccallaro 10 W amp.jpg (318.5 KB, 504 views)
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Last edited by imfree707; 8th August 2011 at 06:33 AM. Reason: Edited to add link to Raymond Haigh's info.
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Old 8th August 2011, 09:17 PM   #1867
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Congratulations Edgar!

I used to destroy speakers using TDAs lots of fun around 18years ago... when I was 16... then I discovered LM1875 and fell inlove with it...

Great PDF as well... thank you for sharing.
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Old 9th August 2011, 08:51 PM   #1868
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Default Now They Tell Me!!!

Quote:
Originally Posted by Pato666 View Post
Congratulations Edgar!

I used to destroy speakers using TDAs lots of fun around 18years ago... when I was 16... then I discovered LM1875 and fell inlove with it...

Great PDF as well... thank you for sharing.
Ha! I went to the datasheet for the LM1875 and it also gives all that great information on grounding and stability concerns. Too bad NS didn't include the info in the LM383 datasheet! It would have been great to know that stuff 30 years ago!!!
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Old 10th August 2011, 05:21 PM   #1869
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My first LM1875 for my PC system
More pics at - https://picasaweb.google.com/1033466...743811/LM1875#

And my LM4780 based 5.1 setup in progress...
More pics -> https://picasaweb.google.com/103346623669691743811/Sub#

Will update the complete build shortly.
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File Type: jpg lm4780.JPG (81.4 KB, 528 views)
File Type: jpg LM1875.JPG (80.1 KB, 588 views)
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Last edited by kuldeepsingh; 10th August 2011 at 05:33 PM.
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Old 11th August 2011, 01:14 AM   #1870
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Quote:
Originally Posted by kuldeepsingh View Post
My first LM1875 for my PC system
Click the image to open in full size.

A PC heat sink without a fan is less efficient than just a 8"x4" square of heavy gauge aluminum plate.
The fins are too dense to allow for efficient convection.
The sink should also be turned 90 degrees so that the fins are vertical to have any hope of convection...
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