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Old 9th August 2010, 09:27 PM   #1501
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thank you koben69
sorry my bad english. I used to connector "Mike connector"
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Old 9th August 2010, 10:19 PM   #1502
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Harolda/Fatihkarali,

Some fine looking kit.

There truly are some talented people on this forum.

Chris.
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Old 11th August 2010, 03:56 AM   #1503
Pato666 is offline Pato666  Argentina
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Quote:
Originally Posted by zebra100 View Post
Harolda/Fatihkarali,

Some fine looking kit.

There truly are some talented people on this forum.

Chris.
I agree!!
Great work guys!
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Old 12th August 2010, 01:39 AM   #1504
MWP is offline MWP  Australia
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My now ~8yr old 6 channel DAC + bridged gainclone amp...
Still works perfectly

My design & home made double sided PCBs.


#1
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#2
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#3
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#4
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#5
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Old 12th August 2010, 02:22 AM   #1505
udailey is offline udailey  United States
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Okay, who's not jealous of this guys skill? Wow, really impressive build. About as impressive as any I have seen.
Uriah
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Old 12th August 2010, 07:08 PM   #1506
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Default My new transconductance chipamp

My CCS singled-ended class A MOSFET amp got me searching for an alternative that was equally simple but a little cheaper to build. The cost of large transformers, big caps, and huge heatsinks seems to add up pretty quick. My search led me to current-drive.info where a very simple current feedback method is described. The vetting of Esa's book can be found here. (I bought a copy.)

Rod Elliot describes essentially the same thing in Project 56 but actually explicitly states that the current drive system I'm using "should never be used in practice" for stability and interference concerns. From Esa's accounting and my prototyping experience I can say that the zobel on the output is mandatory. Without it I had some low frequency instability. The flyback diodes on the output protect the driver when the amp is powered on. As far as interference is concerned, from my experience it is much less susceptible to noise compared to my voltage-driven chipamps.

I used LM675T power opamps. The power caps are 8200uF Pany TS bypassed with 100nF MKPs. In the amplifier section I have 35v 150uf Pany FMs, 10uF tantalums, and 100pF NG0 ceramics. I made a "good faith" attempt at modelling the power supply impedance using the method described by Thorsten here. Whether the modeling and subsequent lower supply impedance at high frequencies results in improved sound quality is an open question, but I figure it is better than shooting in the dark. If the power supply and the amp sections were separated RC snubbers (.5R-1R, 330nF) after the power caps would improve performance but with them so close together I opted not to snubberize.

Layout was done in Eagle and I made the PCBs.
Roger
Attached Images
File Type: jpg IMG_0620 (Custom).JPG (109.4 KB, 452 views)
File Type: jpg IMG_0624 (Custom).JPG (111.9 KB, 479 views)
File Type: jpg IMG_0628 (Custom).JPG (136.1 KB, 631 views)
File Type: jpg IMG_0630 (Custom).JPG (106.9 KB, 615 views)
File Type: jpg IMG_0632 (Custom).JPG (75.3 KB, 440 views)
File Type: png ps_impedance.png (112.3 KB, 391 views)
File Type: png schematic.png (104.7 KB, 353 views)
File Type: png layout.png (58.7 KB, 454 views)

Last edited by roger_lew; 12th August 2010 at 07:15 PM. Reason: grammar
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Old 12th August 2010, 07:37 PM   #1507
lgreen is offline lgreen  United States
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Default Junk Parts Gainclone

Here is the junk parts gainclone, set of monoblocks. These are a 500 VA PS and Bridge Parallel LM4780s.

Link to DIY Audio Thread


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Sounds better than I thought it would, but the little bricks do get hot.
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Old 12th August 2010, 08:12 PM   #1508
troystg is offline troystg  United States
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VERY nice and I LOVE the hidden LEDs. I was contemplating something similar for my sons amp...
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Old 15th August 2010, 08:44 PM   #1509
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This my 8 channel Gainclone with LM3886 that i' ve use for almost two years now, and i must say i am very happy with the sound.

Power supply uses a transformer 800VA 26+26 V and 94.000μF.

The amp drives drive my 3 way open baffle speakers using active xovers, so only 6 channels are used for the moment.
Attached Images
File Type: jpg IMG_0785.JPG (60.0 KB, 409 views)
File Type: jpg PICT0011.JPG (50.5 KB, 615 views)
File Type: jpg IMG_0727.JPG (92.5 KB, 751 views)
File Type: jpg IMG_0710.JPG (70.8 KB, 729 views)
File Type: jpg IMG_0712.JPG (54.5 KB, 528 views)
File Type: jpg IMG_0788.JPG (72.4 KB, 602 views)
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Old 24th August 2010, 09:31 AM   #1510
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And here is a video of my amp in action.

YouTube - Gainclone amp LM3886
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