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Old 15th March 2012, 03:40 PM   #1821
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Quote:
Originally Posted by manojtm View Post
companies CROWN & Crest Audio they are not supporting self osc UCD for PA application

RGDS
Manoj
Well no, I'm sure they are not. Are they prepared to pay Philips/NXP for a UCD licence, or to comply with Philips/NXPs requirements for licence-free use of the technique?
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Old 15th March 2012, 08:05 PM   #1822
Dimonis is offline Dimonis  Russian Federation
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Originally Posted by CPX View Post
you can still test your amplifier by using substraction.
Yea , something like that , first need to make a good pre-amp , because my amps have gain=10 , the output of the soundcard is'nt enough.
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Old 15th March 2012, 08:16 PM   #1823
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by manojtm View Post

Self osc. UCD is not good for Higher WATT (above 200W).It will create lot of problems
ie. Heat,Noise & high Start up Current
WOW above 200W
And that do you recommend ? What type of feedback?
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Old 15th March 2012, 08:41 PM   #1824
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by manojtm View Post
normally we are using osc=300 KHz for good THD Better for 500 KHz
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Originally Posted by manojtm View Post
from LM4651 & 4652 Notes .


Why you can't understand THD not only depends on frequency , more on deadtime.
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Old 15th March 2012, 08:42 PM   #1825
CPX is offline CPX  Romania
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Dimonis... self osc ucd can give 10kw if you want.
Make some tests without preamp..use my gain 10 2/3 power divider schematic that i posted a while ago.
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Old 15th March 2012, 10:11 PM   #1826
Dimonis is offline Dimonis  Russian Federation
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Originally Posted by CPX View Post
self osc ucd can give 10kw if you want.
I don't doubt , tell this manojtm
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Old 16th March 2012, 01:00 AM   #1827
norazmi is offline norazmi  Malaysia
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Quote:
Originally Posted by CPX View Post
Dimonis... self osc ucd can give 10kw if you want.
Make some tests without preamp..use my gain 10 2/3 power divider schematic that i posted a while ago.
absolutely right, CPX can u post again optimum pre-amp for ucd? i want to improve gain with my discrete ucd , wanna see if there is lot improvement with preamp and without it, i`ll report the result here after..

thanks.
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Old 16th March 2012, 01:00 AM   #1828
norazmi is offline norazmi  Malaysia
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I don't doubt , tell this manojtm
u already told him many time before,
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Old 16th March 2012, 01:04 AM   #1829
norazmi is offline norazmi  Malaysia
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pssttt... Dimonis, wanna see video exercusion test with parallel mosfet again? hihi
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Old 16th March 2012, 08:18 AM   #1830
manojtm is offline manojtm  India
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Hi all
sorry for troubling all of you
thanks CPX & Dimonis
word from Apex :
We always must made so many compromise, and never made best amplifier we can. Never can be made best amplifier, nothing is perfect.

RGDS
Manoj
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