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Class D Switching Power Amplifiers and Power D/A conversion

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Old 9th June 2013, 08:33 PM   #341
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1/ Join all the audio ground together.
2/ Join all the power supply grounds together.

Take track from the audio ground to the edge connector where ground comes in.
This now the star ground point.
Take a track from the power supply ground to the same point.

Words explain it better than a picture.

I have used this technique on 4 audio systems now and never had a hum problem.
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Old 9th June 2013, 09:14 PM   #342
stewin is offline stewin  Kenya
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thanks nigelwright
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Old 9th June 2013, 09:43 PM   #343
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I did something like this on my latest UcD prototype and despite beeing a bit of a mess on a piece of prototyping board, it so far has the lowest noise floor yet.

http://i.imgur.com/pW980Gx.jpg
http://i.imgur.com/0B48NDu.jpg
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Old 10th June 2013, 04:14 AM   #344
paskal9 is offline paskal9  Malaysia
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Quote:
Originally Posted by nigelwright7557 View Post
1/ Join all the audio ground together.
2/ Join all the power supply grounds together.

Take track from the audio ground to the edge connector where ground comes in.
This now the star ground point.
Take a track from the power supply ground to the same point.

Words explain it better than a picture.

I have used this technique on 4 audio systems now and never had a hum problem.
also it might a good idea to isolate the audio ground (signal ground) to power ground with a small value resistor.

hum (usually) won't be a problem if you work with 2-3 channels but the possibility of humming shoots up with >4 channel in a single case. in my experience at least.
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Old 10th June 2013, 07:13 AM   #345
stewin is offline stewin  Kenya
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Quote:
Originally Posted by paskal9 View Post
also it might a good idea to isolate the audio ground (signal ground) to power ground with a small value resistor.

hum (usually) won't be a problem if you work with 2-3 channels but the possibility of humming shoots up with >4 channel in a single case. in my experience at least.
i very much agree with you on that point .many amps i have assembled, when i use more than two channels class d i have serious noise issues . untill i change my layout or i remove preamp circuit if i am using one.

Last edited by stewin; 10th June 2013 at 07:17 AM.
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Old 10th June 2013, 01:54 PM   #346
exflaco is offline exflaco  Armenia
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Two or more chennels Stewin 25khz ferq diference betwen channels ,or exact the same freq oscilattor (external sincro)
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Old 10th June 2013, 08:18 PM   #347
stewin is offline stewin  Kenya
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two channels three or four of identical class d. ucd or non ucd also same challenge with discreet class d
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Old 17th June 2013, 11:50 AM   #348
manojtm is offline manojtm  India
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Quote:
Hi Manoj,
Please give me more details.
You said it is 1000 watts - now is it stereo or mono ? Sorry I didn't read the whole thread.
You have said the voltage is 45V - is that AC or DC. Now you said you reduced it from 75 to 45. I am rewinding a Microwave transformer, so I can do either, just need a ampere rating.
Let me look through the thread for all other information. And I saw you said it sounds great. Compare the type of sound to something I might know - I have lots of vintage pioneer, marantz, yamaha etc etc. I also have listened to a bunch of newer receivers. Yamaha DSP3090 etc etc.
So You could say its like a pioneer sx 880 but has more power. That would be fine.

And how much shipped to USA.

Thanks.
Srinath.
Hi Srinath,

(a) completed working AUD600 Power AMP Board(IR MOSFET with COILCRAFT Filter),AUD600 Power Board,Signal&Clip indicator board,Volume control with limiter and Balanced input jack.(without transformer)(supply rail DC Min. +/-35V max. +/-47V) Price $180 shipping charge extra.

(b) completed working AUD600 Power AMP Board(FDA MOSFET with COILCRAFT Filter),AUD600 Power Board,Signal&Clip indicator board,Volume control with limiter and Balanced input jack.(without transformer)(supply rail DC min +/- 45V max. +/-70V) Price $185 shipping charge extra.

Spec
(a) Power FTC RMS 8R @275W
Power FTC RMS 4R @550W
Power FTC RMS 2R @1000W

(b) Power FTC RMS 8R @600W
Power FTC RMS 4R @1200W
Power FTC RMS 2R @2450W


Regards
MANOJ

Last edited by manojtm; 17th June 2013 at 11:54 AM.
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Old 21st June 2013, 02:30 AM   #349
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Today test all version of AUD600
crystal clear sound ,powerful.
all version of AUD600 working.
no issue with 74hc04,
version 3.0 & ver 1.1 working ...

thanx manoj sir
regard
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Old 21st June 2013, 07:29 AM   #350
manojtm is offline manojtm  India
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Hi,

Thank you ravpreet

Regards
MANOJ
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