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Chip Amps Amplifiers based on integrated circuits

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Old 12th April 2011, 03:21 AM   #1741
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^
Oh ... great.
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Old 12th April 2011, 04:17 PM   #1742
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Now complete.
Sound is satisfactory.
New image.
Video (regular camera).
YouTube - MOV01516.

YouTube - MOV01522.

YouTube - MOV01521.
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Old 13th April 2011, 02:47 PM   #1743
JonGain is offline JonGain  United States
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that is some very nice P2P work........
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Old 13th April 2011, 02:53 PM   #1744
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I am a big fan of P2P gainclones

It's the first time I've seen Denon capacitors, I thought they only assemble components.
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Old 13th April 2011, 03:06 PM   #1745
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And BTW, you don't really need those high wattage resistors. You could even get away with 125mw resistors.

Quote:
Originally Posted by mindutis View Post
I understand what you are saying Waiting for more pictures.
One question... why are you using LM3886, and not LM3875?
Starting by 4 ohm loads support is a good reason
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Old 13th April 2011, 08:29 PM   #1746
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Default Looks Pro-Built....

Quote:
Originally Posted by monkey29 View Post
Hello everybody,

This is my new system. LME49830 + MOSFET output stage. MOS PA.
...snipped IMG's...

Looks Pro-Built, and if it had been, man, would have it been expensive!!! Great job!
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Old 14th April 2011, 01:41 PM   #1747
bbm3 is offline bbm3  United States
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Another really cool design tiger.
I like the tube amp look, very creative.
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Old 15th April 2011, 08:40 AM   #1748
Piggy is offline Piggy  Hong Kong
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Default My first DIY amplifier

Finally completed my first amplifier. Learned a lot from this forum. Thanks a lot.
Circuit diagram is from LM4780 datasheet Fig5, I just modified it a little bit.
Grounding topology is also from LM4780 datasheet, see the ref broad composite layer. But I don't have the 2R7 between the signal ground star and the power ground star. Pin7 is connected to the power ground star.
At some point the audio ground must be connected to the mains ground. I use “The power amp design handbook 5th edition” fig18.1 as my reference. Together with the ESP disconnected network(with 100R resistor), the amplifier is hum free in a CAS system at full volume. However if the power ground star is connected to the mains ground via the disconnected network, when I turn the volume control beyond 3 o'clock position, at the speaker terminal I measured 0.1mVac (measured by a Fluke 77) and I can hear the hum about 1 feet away from the speaker. This is the most difficult part of the project.
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Old 15th April 2011, 01:53 PM   #1749
Piggy is offline Piggy  Hong Kong
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Sorry I mean "Audio power Amplifier design handbook" by D. Self not "The power amp design handbook"
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Old 15th April 2011, 11:30 PM   #1750
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my first post at DIYaudio
Amplifier on 2xtda7294 and power supply on IR2153.
Click the image to open in full size.
Click the image to open in full size.
I love traaaance

Last edited by MaXwellHouse; 15th April 2011 at 11:43 PM.
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