ucd 25 watts to 1200 watts using 2 mosfets - Page 177

Dimonis · 9th March 2012, 06:16 PM

Quote:

Originally Posted by norazmi

only one hot is filter caps 1uf, huh.... so im worried it will explode if play long, so i reduce it back to 250 khz, why that caps hot?

Surely bad cap , to bad.

CPX · 9th March 2012, 06:18 PM

Dimonis :
They require kwatts and full audio band

...personally i am interested in getting my amplifier THD and IMD lower...but since no one makes those tests i have no help in this matter

.

norazmi:
What residual amplitude do you have?

Dimonis · 9th March 2012, 06:46 PM

Quote:

Originally Posted by CPX

Dimonis :
my amplifier THD and IMD lower...but since no one makes those tests

Maybe you'll paste some measurement THD+N of your amp?

Which programm is suitable for this ?
I have Spectra Plus 5.0 , but didn't try it .

CPX · 9th March 2012, 06:59 PM

I am using RightMark Audio Analyzer 6.2.3(free version) and Acoustic Analyzing System 5E(THD only), they give similar results.

Some measurements:

norazmi · 9th March 2012, 08:30 PM

Quote:

Originally Posted by CPX

Dimonis :
They require kwatts and full audio band

...personally i am interested in getting my amplifier THD and IMD lower...but since no one makes those tests i have no help in this matter

.

norazmi:
What residual amplitude do you have?

cpx , ive download the program u told me, and i need time to learn coz too many setting and option, ill try to learn it as fast as i can. Btw what exactly cause filter caps become hot? Too high freq?

CPX · 09:33 PM

norazmi:
To much esr...and too much disipation when testing with high voltage and high frequency output, with no input signal and normal oscilation you shoud have no heating.

To use that software you need to make an output divider and filter.I made some very aproximative calculations..

. but i hope it helps.

irvynejay · 10th March 2012, 05:26 AM

hello can ask some thing is it possible to use irf3710 ,IRF3808,IRF2807 for class d amps?

manojtm · 10th March 2012, 12:35 PM

Hi All
CPX you are doing a wrong method
Desktop computer already have noise(More compare with Laptop) , so how you measure THD+N????

manojtm · 10th March 2012, 01:04 PM

Hi All

Class D AMP using second order filter so ie. L=(.225*RL)/Fc
Fc is cutoff freq.;Cut off freq. is the final out put
so just tell me the THD+N you measure from where? with cut off freq. or without

Regards Manoj

Dimonis · 10th March 2012, 01:38 PM

Quote:

Originally Posted by manojtm

Hi All
CPX you are doing a wrong method
Desktop computer already have noise(More compare with Laptop) , so how you measure THD+N????

Please show your right method

Noise have all equipment

, best audiocards for desktop comps have about 0,001% THD+N , don't think that you diyamp is somethink equal

.

9th March 2012, 06:18 PM	#1762
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	Dimonis : They require kwatts and full audio band...personally i am interested in getting my amplifier THD and IMD lower...but since no one makes those tests i have no help in this matter. norazmi: What residual amplitude do you have?

9th March 2012, 09:28 PM	#1766
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	norazmi: To much esr...and too much disipation when testing with high voltage and high frequency output, with no input signal and normal oscilation you shoud have no heating. To use that software you need to make an output divider and filter.I made some very aproximative calculations... but i hope it helps. Last edited by CPX; 9th March 2012 at 09:33 PM.

10th March 2012, 05:26 AM	#1767
irvynejay diyAudio Member Join Date: Nov 2010 Location: Philippines;Mindanao,Butuan	hello can ask some thing is it possible to use irf3710 ,IRF3808,IRF2807 for class d amps? __________________ Knowing GOD is not being good,Knowing GOD is just knowing him as my friend

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9th March 2012, 06:59 PM	#1764
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	I am using RightMark Audio Analyzer 6.2.3(free version) and Acoustic Analyzing System 5E(THD only), they give similar results. Some measurements:

10th March 2012, 12:35 PM	#1768
manojtm diyAudio Member Join Date: Aug 2008	Hi All CPX you are doing a wrong method Desktop computer already have noise(More compare with Laptop) , so how you measure THD+N????

10th March 2012, 01:04 PM	#1769
manojtm diyAudio Member Join Date: Aug 2008	Hi All Class D AMP using second order filter so ie. L=(.225*RL)/Fc Fc is cutoff freq.;Cut off freq. is the final out put so just tell me the THD+N you measure from where? with cut off freq. or without Regards Manoj

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