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Old 14th March 2012, 01:53 PM   #1801
manojtm is offline manojtm  India
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Hi Dimonis

increase gate resistor with correct value , decrease temp.
normally we are using osc=300 KHz for good THD Better for 500 KHz

I use osc=125 KHz it is not BAD and filter 4th order one

RGDS
Manoj
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Old 14th March 2012, 06:14 PM   #1802
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Hi manojtm about your UCD 625,your oscillator there is about 102 khz square wave,what if i'm going to use around 500 khz triangular wave? are there any part's to be changed? is it possible for me to use this amp for full range @ 4 ohm's load,thank's.
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Old 14th March 2012, 06:47 PM   #1803
stewin is offline stewin  Kenya
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nice work cool video .BTW the fets in your video are they irfp250 2pairs?
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Old 14th March 2012, 08:42 PM   #1804
norazmi is offline norazmi  Malaysia
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Yep Stewin, irfp250n, they run happily with it
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Old 15th March 2012, 05:00 AM   #1805
manojtm is offline manojtm  India
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hi don2007ksa

don't go for 500Kz , thd+n will increase better for 250 or 300khz
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Old 15th March 2012, 06:18 AM   #1806
manojtm is offline manojtm  India
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don2007ksa

use cd4060 with 8MHz crystal
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Old 15th March 2012, 07:26 AM   #1807
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by manojtm View Post

increase gate resistor with correct value , decrease temp.
-increases the switch times of the mosfets(rise & fall) - increases the deadtime - increases the THD .
For the subamp application it'll do , but for the full range......

Quote:
Originally Posted by manojtm View Post

I use osc=125 KHz it is not BAD and filter 4th order one
Yea , at that freq you can bravely use 2-3 pairs of mosfets (4227)

Quote:
Originally Posted by manojtm View Post

normally we are using osc=300 KHz for good THD Better for 500 KHz
What driver & mosfet?
And about THD - how much better ? maybe you'll post some ?
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Old 15th March 2012, 09:27 AM   #1808
Dimonis is offline Dimonis  Russian Federation
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Hi CPX
Quote:
Originally Posted by CPX View Post
I am using RightMark Audio Analyzer 6.2.3(free version) and Acoustic Analyzing System 5E(THD only), they give similar results.
My soundcard (built-in on motherboard Intel DP35) has such results (measured line-in-line-out) . I think they are not good enough for measurement?
And my netbook has awful noise ~56dB and IMD ~0.5%
Can't find Acoustic Analyzing System 5E , can you share it with me?
Attached Images
File Type: jpg RMAA my soundcard.JPG (60.3 KB, 756 views)
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Old 15th March 2012, 09:44 AM   #1809
Dimonis is offline Dimonis  Russian Federation
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Hi don2007ksa
Quote:
Originally Posted by don2007ksa View Post
Dimonis i have 60 hertz,+/- 90 VOLTS @ 800 watts power transformer,i'm going to used a 4 ohm's load around 700watt's full range speaker,thank's.
I think the best solution is the amp from this thread
http://www.diyaudio.com/forums/attac...ir2110_ucd.zip
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Old 15th March 2012, 01:44 PM   #1810
manojtm is offline manojtm  India
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Quote:
I think the best solution is the amp from this thread
http://www.diyaudio.com/forums/attac...ir2110_ucd.zip
Hi dimonis

Self osc. UCD is not good for Higher WATT (above 200W).It will create lot of problems
ie. Heat,Noise & high Start up Current
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