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Old 9th November 2018, 01:53 AM   #411
Johnny Canuck is online now Johnny Canuck  Canada
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Originally Posted by Praudio View Post
asanden what brand your 3300uF Audio capacitor?
They look like Nichicon KA.
https://www.mouser.ca/datasheet/2/293/e-uka-884128.pdf
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Old 9th November 2018, 02:42 AM   #412
Praudio is offline Praudio
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Nice will try it !
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Old 9th November 2018, 03:39 AM   #413
fab is online now fab  Canada
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USSA-5 Build with Review
Hi asanden
Thanks again for your feedback

For that damping factor measurement I meant that the precision on your 7.5x?ohms exact value makes a big difference in the calculation. Also have in mind that if the resistor is heating then its value will increase and affect the result. Ensure to test at power low enough with a high power resistor to increase the precision.

As for my FFT results, you need to add +10dB to the numbers you have indicated since at 1K Hz I have -10dB level. The goal is to ensure to not saturate your input measurement circuit with a too high level otherwise you measure THD created by your sound card.

Keep us posted if you increase the bias.

Fab
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Last edited by fab; 9th November 2018 at 03:47 AM.
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Old 9th November 2018, 08:26 AM   #414
asanden is offline asanden  Netherlands
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Yes correct, UKA

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