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Old 17th December 2012, 01:11 PM   #3051
manojtm is offline manojtm  India
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Quote:
thanks dear friend
i buy the 1% resistor for change your amp FREQ but i dont know how and dont know value.
sorry
Hi Hadi,

change 1K 1% to 510 Ohm 1% change IRFP250 to IRFB4227 (TO247) OR any <100nc MOSFET change gate resistor 39 Ohm to 47 Ohm and filter;

Filter: T106-2 0.8mm wire @50Turns (@33uH). {you can use IRFP250 fsw=@400KHz IRFP250 and IR2110 will heat like >45 degree}

now AUD600 fsw will be @400KHz.

my test it shows 388KHz @ 8R spk load

Quote:
i waiting for your email sir manoj
thanks
it will take more time

Regards
MANOJ

Last edited by manojtm; 17th December 2012 at 01:15 PM.
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Old 17th December 2012, 01:34 PM   #3052
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Default THanks to sir manoj

Quote:
Originally Posted by manojtm View Post
Hi Hadi,

change 1K 1% to 510 Ohm 1% change IRFP250 to IRFB4227 (TO247) OR any <100nc MOSFET change gate resistor 39 Ohm to 47 Ohm and filter;

Filter: T106-2 0.8mm wire @50Turns (@33uH). {you can use IRFP250 fsw=@400KHz IRFP250 and IR2110 will heat like >45 degree}

now AUD600 fsw will be @400KHz.

my test it shows 388KHz @ 8R spk load



it will take more time

Regards
MANOJ
in my country the tecnologie was 10 years older than other place even in mosfet
i can not find here irfb or irfi mosfets
we have here just some irf and irfp type
i buy 680 and 820 ohm 1%
i dont have 510 ohm
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Old 18th December 2012, 03:56 AM   #3053
manojtm is offline manojtm  India
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Quote:
i buy 680 and 820 ohm 1%
i dont have 510 ohm
Hi Hadi,

I can understand your feeling ; use 820 Ohm 1% only you have to change filter
Filter : T106-2 0.8mm wire @59Turns(@47uH).

fsw=@300KHz.

Regards
MANOJ
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Old 18th December 2012, 04:56 AM   #3054
manojtm is offline manojtm  India
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Hi Hadi,

did you get IRF640 in your country.you can use IRF640 fsw=@400KHz.

Regards
MANOJ
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Old 18th December 2012, 05:39 AM   #3055
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Default THanks to sir manoj

Quote:
Originally Posted by manojtm View Post
Hi Hadi,

did you get IRF640 in your country.you can use IRF640 fsw=@400KHz.

Regards
MANOJ
hi sir manoj
i find IRF640
i have IRF820---IRF540n---IRFZ44n---IRF630 too.
how much power by IRF640 i have in AUD600 ?
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Old 18th December 2012, 05:46 AM   #3056
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i was find IRFB31N20D too
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Old 18th December 2012, 08:05 AM   #3057
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Quote:
Originally Posted by Hadighorbani View Post
hi sir manoj
i find IRF640
i have IRF820---IRF540n---IRFZ44n---IRF630 too.
how much power by IRF640 i have in AUD600 ?
IRFB31N20D is the best choice use it, forget IRFZ44N and IRF820, IRF540N can be use with +/-35V rail, IRF640 with +/-55V and you will get 50W or 100W on 8 ohms. With IRFB31N20D power will be over 200W on 8 ohms.
Power will be same with AUD600 or IRS900D (IRS1500D) or D200.
Regards

Last edited by apexaudio; 18th December 2012 at 08:08 AM.
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Old 18th December 2012, 09:53 AM   #3058
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thanks sir apex
what about gate resistor ?
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Old 18th December 2012, 09:53 AM   #3059
manojtm is offline manojtm  India
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Quote:
i was find IRFB31N20D too
Hi Hadi,

31n20d is 200V 31A,100nC MOSFET. it will support fsw=@450KHz

75V supply 710W RMS @ 8R Load FTC rating.

IRF640 is 200V 18A, 72nC MOSFET. for 75V supply only for 8R load.

Regards
MANOJ
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Old 18th December 2012, 10:51 AM   #3060
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thanks sir manoj
what is the value off gate resistor ?
i really need a power full smps.
IRS 900---1500---2000---3000 is in the way.
some body help me for smps.
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