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Class D Switching Power Amplifiers and Power D/A conversion

ucd 25 watts to 1200 watts using 2 mosfets
ucd 25 watts to 1200 watts using 2 mosfets
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Old 23rd November 2012, 10:45 AM   #2931
ionutzxpo is offline ionutzxpo  Romania
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Location: Romania,Calarasi
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not for njm for NE5532
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Old 23rd November 2012, 12:34 PM   #2932
Hadighorbani is offline Hadighorbani  Iran
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ok
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Old 23rd November 2012, 02:01 PM   #2933
Hadighorbani is offline Hadighorbani  Iran
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Join Date: Jun 2010
Hi sir manoj
DC offset is -0.001 now
i use 1k 1% resistor
i dont have DSO or CRO
relay steal have problem
some time was conect and some time was disconect
i steal use + - 35 VDC for input amp
i have noise steal like hissssssss
the relay was disconect the band
i paraleld a LED with relay self for know when it is work
what can i do now ?

Last edited by Hadighorbani; 23rd November 2012 at 02:13 PM.
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Old 23rd November 2012, 02:17 PM   #2934
Hadighorbani is offline Hadighorbani  Iran
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when i conect the power after 2 secound the relay work and conect amp to band but after 1 second the relay is turn off and disconect the exit from band and core start to creat noise like hissssssssss.
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Old 23rd November 2012, 02:38 PM   #2935
Hadighorbani is offline Hadighorbani  Iran
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i change all IC
is this right 74HC04 ?
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Old 23rd November 2012, 02:40 PM   #2936
Hadighorbani is offline Hadighorbani  Iran
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i connect input signal
shild conect to GND
+ signal connect to + input
nothing conrct to - input and it is not connect to GND
right ?
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Old 23rd November 2012, 03:14 PM   #2937
Hadighorbani is offline Hadighorbani  Iran
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Join Date: Jun 2010
Default thanks to sir manoj

Quote:
Originally Posted by manojtm View Post
Hi Hadi,

check with this

regards
MANOJ
Hi sir manoj
this layout is deferent with ver 1.1
why ?
is this ver 1.0 ?
thanks
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Old 23rd November 2012, 04:01 PM   #2938
Hadighorbani is offline Hadighorbani  Iran
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one of the 47 ohm resistor creat smoke
resistor near the ETD29 core
the relay was conect and disconect meny time when i tuch the 100k volume legs
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Old 23rd November 2012, 04:05 PM   #2939
Hadighorbani is offline Hadighorbani  Iran
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are you finished you amp stewin ?
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Old 23rd November 2012, 05:54 PM   #2940
stewin is offline stewin  Kenya
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not yet. i,m busy but i will try to finish it. next week
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