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Old 9th March 2012, 06:16 PM   #1761
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by norazmi View Post
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.
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Old 9th March 2012, 06:18 PM   #1762
CPX is offline CPX  Romania
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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?
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Old 9th March 2012, 06:46 PM   #1763
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Originally Posted by CPX View Post
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 .
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Old 9th March 2012, 06:59 PM   #1764
CPX is offline CPX  Romania
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I am using RightMark Audio Analyzer 6.2.3(free version) and Acoustic Analyzing System 5E(THD only), they give similar results.

Some measurements:
Click the image to open in full size.
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Old 9th March 2012, 08:30 PM   #1765
norazmi is offline norazmi  Malaysia
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Quote:
Originally Posted by CPX View Post
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?
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Old 9th March 2012, 09:28 PM   #1766
CPX is offline CPX  Romania
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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.

Click the image to open in full size.

Last edited by CPX; 9th March 2012 at 09:33 PM.
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Old 10th March 2012, 05:26 AM   #1767
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hello can ask some thing is it possible to use irf3710 ,IRF3808,IRF2807 for class d amps?
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Old 10th March 2012, 12:35 PM   #1768
manojtm is offline manojtm  India
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Hi All
CPX you are doing a wrong method
Desktop computer already have noise(More compare with Laptop) , so how you measure THD+N????
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Old 10th March 2012, 01:04 PM   #1769
manojtm is offline manojtm  India
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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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Old 10th March 2012, 01:38 PM   #1770
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by manojtm View Post
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.
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