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Chip Amps Amplifiers based on integrated circuits

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Old 3rd November 2013, 09:57 AM   #2551
Mihkus is offline Mihkus  Estonia
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I found use for those LA4140 chips... They drive my LM3915 VU meter Tower, i somehow managed to destroy the 386 chip but now it works again but with a sanyo chip

http://youtu.be/X-urfcKvtGg

[VIDEO]http://youtu.be/X-urfcKvtGg[/VIDEO]

Lots of fun and a bit light for my department... Freakin dark in here but not anymore

Last edited by Mihkus; 3rd November 2013 at 10:11 AM.
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Old 3rd November 2013, 06:14 PM   #2552
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I just finished a first playing state of a Peter Danielís premium LM3875 Amplifier Kit. This one has a dedicated rectifier board per channel and unusual single 400Vac with centre tapped secondary windings, which I salvaged from an old Rotel power amp. Peter advised me not to use a single transformer, for the risk of getting a hum problem with two rectifier boards, but since I already had all the parts I gave it a try anyway. Fortunately I didnít notice any hum yet. To use centre Tapped, means only using 4 diodes per side instead of eight. I also put in a slowstart board, which Iím not sure is needed but at least turning the amp on/off creates no audible noise which is what I was after.
This is my first experience with a Gainclone (and only the second amp I ever build from scratch) and I can already tell this is a seriously good amp, maybe a bit relentless even, I had to plug in my old speakers which are less analytical to keep things more musical. Obviously the new components still need to burn in but Iíve had a few goose bump moments allready..

Thanks to everybody on this forum for inspiring me to build this amp.

For people still on the fence about one of these. This amp is ridiculously easy to build, even I could do it & Peter Danielís Kitís make it even easier (www.audiosector.com)

Here are some pictures. I went for this form factor to match my Audio-GD NFB-28 DAC/Pre-amp.
Attached Images
File Type: jpg untitled-2986_30_50.jpg (196.3 KB, 1264 views)
File Type: jpg untitled-2991_30_70.jpg (244.1 KB, 1235 views)
File Type: jpg untitled-2983_50_30.jpg (182.9 KB, 1213 views)
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Old 4th November 2013, 04:02 AM   #2553
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Some better pictures
Click the image to open in full size.Click the image to open in full size.

Quote:
Originally Posted by ajst2duk View Post
I just pulled my LM3875 out if retirement for the day and am blown away at how good this sounds. I recall thinking it was a little light on the bottom end - but listening now it totally belies belief. It's fed by a Teddy Powerreg at 28.5V regulated rails and some tests I did today confirm just now effective the regulation is. It runs through an X-10D clone buffer with genalex gold lion 6922 valves and an alps blue velvet 10 ohm pot.
Lovely sound - detailed full and very easy to listen to.
Click the image to open in full size.
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Old 5th November 2013, 01:48 PM   #2554
gadut is offline gadut  Indonesia
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Decided to finish and close my ref rev.c project after several parts replacement, focus on other builds. i'm happy to hear it now
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File Type: jpg my ref_chassis.JPG (374.5 KB, 196 views)
File Type: jpg my ref_inside.jpg (453.4 KB, 280 views)
File Type: jpg my ref_board.JPG (257.6 KB, 328 views)
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Old 12th November 2013, 05:34 PM   #2555
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Default Finished a simple LM3886

Kit is from chipamp.com, base case is bamboo and the top plate is 3mm aluminium.

Michael
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File Type: jpg IMG_0248.jpg (427.9 KB, 285 views)
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Old 12th November 2013, 09:45 PM   #2556
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Quote:
Originally Posted by zimmer64 View Post
Kit is from chipamp.com, base case is bamboo and the top plate is 3mm aluminium.

Michael
Nice, looks smart and purposeful.
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Old 12th November 2013, 10:27 PM   #2557
davym is offline davym  Scotland
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Quote:
Originally Posted by gadut View Post
Decided to finish and close my ref rev.c project after several parts replacement, focus on other builds. i'm happy to hear it now
Nice build gadut, what's the other board in front of the My Ref board on the left?
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Old 20th November 2013, 12:58 PM   #2558
bcmbob is offline bcmbob  United States
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Here is a link to a "Disaster Recovery" post for an attempt to ship a chip based amp build.

This is the story of the first effort if your'e interested.
Attached Images
File Type: jpg Breakfix (6).jpg (331.5 KB, 335 views)
File Type: jpg Breakfix (10).jpg (144.7 KB, 302 views)
File Type: jpg Breakfix (11).jpg (124.4 KB, 208 views)
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Last edited by bcmbob; 20th November 2013 at 01:02 PM.
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Old 20th November 2013, 01:09 PM   #2559
troystg is offline troystg  United States
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Very neat layouts! I take it then you got the bad channel sorted out?
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Old 20th November 2013, 01:46 PM   #2560
bcmbob is offline bcmbob  United States
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Thanks Troy, but this is a different flavor of MyRef. These are Dario Inserra's Fremen Edition - RC version. Still haven't built the "Final" version, but the release candidate produces excellent sounds.

The bad channel is on one of the earlier V1.3 offerings from linuxguru. I still don't have that corrected - next week's priority. It's well worth the effort as the V1.3s produce an elegant "Class A" type sound when equipped with some of the modules Siva is developing. The opamps are socketed (as you can see similar in Gadut's photo above) and allow experimentation. The FEs are for the most part, SMD components and aren't as mod friendly.
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Last edited by bcmbob; 20th November 2013 at 02:03 PM.
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