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Class D Switching Power Amplifiers and Power D/A conversion

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Old 2nd May 2012, 11:25 AM   #511
DQ828 is offline DQ828  Australia
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Nice work, why 6 inputs & 2 outputs?

Where did you get the speaker outputs?
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Old 2nd May 2012, 10:53 PM   #512
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*3 inputs stereo
*1 output stereo
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Old 3rd May 2012, 10:25 PM   #513
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Thanks
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Old 4th May 2012, 05:20 PM   #514
kevinkr is offline kevinkr  United States
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hdspeaker please post complete sentences or at least something related to the thread you are posting to.
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Old 4th May 2012, 05:43 PM   #515
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Quote:
Originally Posted by gaetan31 View Post
A few samples that I hope you like
Nice knobs!

KM
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Old 18th May 2012, 05:59 PM   #516
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Default Class D 2.0

Here are some (bad) images of my project: a Class D stereo amp using standrad parts. Sorry, Im not a good photographer!!!

Observe the white caps oriented all in the same direction, and the 4 dark tanks to the right, they are the inductors of a 4 pole output filter, too close between them, and too high mutually coupled, but this is only a protoboard. Ill place all in a new piece of board, and properly spaced.

Briefly I will post the schematic.
Attached Images
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File Type: jpg 5.jpg (434.4 KB, 1969 views)
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Last edited by Osvaldo de Banfield; 18th May 2012 at 06:02 PM.
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Old 21st May 2012, 04:52 PM   #517
ljv76 is offline ljv76  United Kingdom
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Hi all

This is my first post after reading quite a lot of very usefull information when putting together my first couple of amps.

This was my first attempt, a Yuanjing TA2020 modified with 2.2uf 250v Claritycap ESA input caps and cheap fleabay sourced toroids. I replaced the 0.22uf caps behind the inductors as a couple got damaged when I wasn't careful enough removing the original inductors, and I had these wima 0.22uf caps to hand. It is housed in an external light unit along with 4 Sound Reactive RGB LED light strips (60 LEDS in total). I'm very surprised at how good it sounds!

The board;

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The housing;

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It sounded so good I decided to see if buying what seeme to be a better board to start with would give better results so I ordered a Helder MK111. I found an old power supply in an aluminium chassis at a bootfair to house it in.

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Finally the board arrived, even before hooking it up I changed the input caps for some 2.2uf Obbligato Gold Premium+ that I had to hand.

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And with a lot of luck it fitted perfectly into the enclosure!

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The verdict? Its definitely better than the modded Yuanjing, but not by as much as I had hoped. The YJ definitely seems to be louder, although the Helder is more refined. I am using my now old Mission 734's and am still amazed amps so small can produce such a great sound from them.

I have since relented, this was meant to be a 'serious' amp. but I've built in blue sound reactive leds, looks amazing at night!

Now for something more powerful....

So, thanks to all that contribute to this forum, you may not always get direct replies but the advice to be found is invaluable to a beginner like myself.
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Old 23rd May 2012, 03:05 PM   #518
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I found knobs on ebay on 'diy_hifi_supply50' store and the PSE terminals from 'wonderco_buy' when they were available.
Knobs are still available from: Knob --CNC Solid Aluminum, Buff-cote | Diy HiFi Supply
For the speaker terminal maybe contact wonderco_buy through eBay if he still have some.
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Old 23rd May 2012, 03:24 PM   #519
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Default Class D 2.0

As I promised, here is my Class D 2.0 circuit:
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Old 27th June 2012, 12:26 PM   #520
AJT is offline AJT  Philippines
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finished the drw150 in a flaming red chassis:

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