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Old 12th January 2013, 01:08 PM   #261
IRSound is offline IRSound  Germany
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Hi Manoj , i attached new schematic.
but IR2110S is correct in Apex D200 PCB because he replaced it with IR2110.
also why we should use 2W for R175 ? because mile tested this amp with 0.25w R175 ?
did you check your amps with DSO ? did you see my testing waves ? where is the problem..
sorry for lots of questions.

Regards
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Old 13th January 2013, 12:19 AM   #262
IRSound is offline IRSound  Germany
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Quote:
Originally Posted by apexaudio View Post
10 is 10k resistor, not 68k, there is not 68k resistor on this amp only 6k8.
Use IRF640N and 47 ohm instead 100 ohm, ICs are TL081, 74HC00 and IR2110.
Regards
Hi Mile ,

could you please tell me the complate part number of your ICs and their manufacture ?

Regards
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Old 13th January 2013, 12:11 PM   #263
manojtm is offline manojtm  India
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Quote:
why we should use 2W for R175 ? because mile tested this amp with 0.25w R175 ?
If you use c136(56pF/100V) R175(4k7) will heat and 0.25W will burn within sec.

Regards
MANOJ
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Old 16th January 2013, 02:01 AM   #264
Hari W is offline Hari W  Indonesia
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Quote:
Originally Posted by don2007ksa View Post
hi Hari good day,any schematic of this apex D500 planning to build one for my FULL range application,thank's.
hi Don, sory to late answer,

do you have any schematic for fullrange d500, if you have yes please, the schematic can attach to this forum?

Thanks.
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Old 22nd January 2013, 02:19 PM   #265
IRSound is offline IRSound  Germany
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Continue from Manoj page...

i'm using 47 ohm resistor for IRFB4227 @ 250Khz.but mosfets gets warm (50c) at 50w into 8 ohm load specially low side mosfet. (sine wave test). i just want to know what is the best value for IRFB4227 @ 250KHz ...i'm also don't using parallel diodes or HF reduction (R+C) for each mosfet.

specs of my D200 amp :

FSW set to 250KHz (with 47 Gate resistor and IRFB4227)
Supply volage +/- 58v (can deliver up to 1000w) + 34mF cap per rail.
Inductor : 70uH on T157-34 (it's get hot , but ok for this tests)
Output cap : 2*470nF 250v AC
also using external 12.8v for bias instead of BD241.
sound qulality and power is'nt bad , but clipping occurred at 60~70 nominal output specially at high frequency. mosfets get warm even in lower power like 20~50w.

Regards,
IRSound
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File Type: jpg IRSound-D200-2.jpg (84.0 KB, 1151 views)
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Old 22nd January 2013, 02:29 PM   #266
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Quote:
Originally Posted by IRSound View Post
Continue from Manoj page...

i'm using 47 ohm resistor for IRFB4227 @ 250Khz.but mosfets gets warm (50c) at 50w into 8 ohm load specially low side mosfet. (sine wave test). i just want to know what is the best value for IRFB4227 @ 250KHz ...i'm also don't using parallel diodes or HF reduction (R+C) for each mosfet.

specs of my D200 amp :

FSW set to 250KHz (with 47 Gate resistor and IRFB4227)
Supply volage +/- 58v (can deliver up to 1000w) + 34mF cap per rail.
Inductor : 70uH on T157-34 (it's get hot , but ok for this tests)
Output cap : 2*470nF 250v AC
also using external 12.8v for bias instead of BD241.
sound qulality and power is'nt bad , but clipping occurred at 60~70 nominal output specially at high frequency. mosfets get warm even in lower power like 20~50w.

Regards,
IRSound
Hi irsound
can i use T157-33 for class D output filter?
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Old 22nd January 2013, 02:39 PM   #267
IRSound is offline IRSound  Germany
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Hi Hadighorbani,

It's not anymore in production but i checked micrometals software and they're same with -34. so as i mentioned , it's not a good material because of high core loss. use -2 or other low loss iron powder toroidal cores.
also you can use ferrite cores with air gap but it's not as easy as toroidal ones. detex audio (IRS series amps designer) also using both toroidal and gaped ferrite cores , but i don't know specs of them.

Regards
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Old 22nd January 2013, 05:45 PM   #268
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Quote:
Originally Posted by IRSound View Post
Hi Mile ,

could you please tell me the complate part number of your ICs and their manufacture ?

Regards
TL081 and SN74HC00N manufacture by Texas Instruments and IR2110 manufacture by International Rectifiers, but there is many fake IR2110. Instead UF4007 I use BAV21 and outputs are IRF640N only warm at +/-75V and cold at +/-35V without heatsinks, I use gaped toroidal core PG0208 (made in China). BD241 and 2k2/2W are very hot at +/-75V, 2k2/2W can be replaced with 4k7/2W and BD241 must have heatsink.
Regards

Last edited by apexaudio; 22nd January 2013 at 06:06 PM.
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Old 23rd January 2013, 03:53 PM   #269
IRSound is offline IRSound  Germany
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Class-D IRSound D200-V.0 Based On Apex D200 - a little music+ temperature test :

Class-D IRSound D200-V.0 Based On Apex D200 - a little music+ temperature test - YouTube

so , as i mentioned before , my amp have temperature problem
in this video , i used 48uH (5x0.5mm wire) on two stacked CSC CK270060 , the core was warm about 30~40 C in all tests.
the loudspeaker is a 16 Ohm full-range paralleled with a 8 ohm Electric resistance wire. mosfets get hot during this test as you can see up to 50 C.

please help me...why mosfets gets hot

Regards,
IRSound

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File Type: jpg IRSound-D200-3.jpg (104.5 KB, 1011 views)
File Type: jpg IRSound-D200-4.jpg (117.7 KB, 454 views)
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Old 23rd January 2013, 10:06 PM   #270
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Quote:
Originally Posted by IRSound View Post
Class-D IRSound D200-V.0 Based On Apex D200 - a little music+ temperature test :

Class-D IRSound D200-V.0 Based On Apex D200 - a little music+ temperature test - YouTube

so , as i mentioned before , my amp have temperature problem
in this video , i used 48uH (5x0.5mm wire) on two stacked CSC CK270060 , the core was warm about 30~40 C in all tests.
the loudspeaker is a 16 Ohm full-range paralleled with a 8 ohm Electric resistance wire. mosfets get hot during this test as you can see up to 50 C.

please help me...why mosfets gets hot

Regards,
IRSound

Nice work, use heatsink for mosfets...
Regards
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