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Class D Switching Power Amplifiers and Power D/A conversion

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Old 18th December 2012, 10:54 AM   #191
IRSound is offline IRSound  Germany
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Mile ,

why you aren't use electrolyte capacitor behind the mosfets ? (to avoid PS pumping)
and do you know any commercial pro amps which use this type of circuit ?
sorry mile for repeating this , can you give us schematic ?

Hadighorbani,

i think your toroid cores aren't original , because their color is bright red and have some differences in packaging (take a look at attached images)..you should test your amp with 500~1000w power supply and use dummy loads. then , you can test your core with higher output power. with asymmetrical 25v supply you cant achieve high power.

Regards,
IRSound
Attached Images
File Type: jpg Original T106-2.jpg (86.0 KB, 836 views)
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Old 18th December 2012, 01:50 PM   #192
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Quote:
Originally Posted by IRSound View Post
Mile ,

why you aren't use electrolyte capacitor behind the mosfets ? (to avoid PS pumping)
and do you know any commercial pro amps which use this type of circuit ?
sorry mile for repeating this , can you give us schematic ?

Hadighorbani,

i think your toroid cores aren't original , because their color is bright red and have some differences in packaging (take a look at attached images)..you should test your amp with 500~1000w power supply and use dummy loads. then , you can test your core with higher output power. with asymmetrical 25v supply you cant achieve high power.

Regards,
IRSound
In post #92 you can see similar schematic from Mackie active speaker SRM450V2, and all diy frendly amps in this forum IRS900, 1500, 2000, 3000 and AUD600 use topology from IRADAMP 1 http://www.irf.com/technical-info/re.../iraudamp1.pdf
Regards
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Old 18th December 2012, 03:20 PM   #193
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Hi IRsound
i dont have power full smps
this core not heat when i use that
when i take picture it was night and i change the camera color seeting to have good quality picture.
i burn to sub woofer 305C pioneer with sir manoj amp and this core in one time.
can you please say to me orighinal core wight ?
thanks
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Old 18th December 2012, 05:37 PM   #194
mihailo is offline mihailo  Serbia
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Hi Mile,
I don't have red core. Only blue, green(light green), and black. And some yellow from PC PSU. Can I use any of them for this amp?
Also can some IRFP fets be used for this? Like IRFP 240,260,350,450,460?
Regards
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Old 18th December 2012, 06:32 PM   #195
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Quote:
Originally Posted by mihailo View Post
Hi Mile,
I don't have red core. Only blue, green(light green), and black. And some yellow from PC PSU. Can I use any of them for this amp?
Also can some IRFP fets be used for this? Like IRFP 240,260,350,450,460?
Regards
Core must be micrometals T106-2 with 62 turns 1mm wire and IRFB31N20D can be use instead IRFB4227, IRFPs can't be use, only IRF640 for test with +/-50V max.
Regards
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Old 18th December 2012, 07:59 PM   #196
mihailo is offline mihailo  Serbia
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Thanks Apex, IRFB31N20D can be found in local store.
I had look on web, all cores are micrometal, and T106:
1.Product Colour Code: Grey / Clear core: T106-3 Micrometals Iron Powder Toroid
2.Product Colour Code: Green/Yellow core: T106-40 Micrometals Iron Powder Toroid
3.Yellow core: toroidal inductor iron powder core T106-26
4.Product Colour Code: Green/Blue core:T106-52 Micrometals Iron Powder Toroid
Regards
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Old 18th December 2012, 09:03 PM   #197
IRSound is offline IRSound  Germany
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Quote:
i dont have power full smps
this core not heat when i use that
when i take picture it was night and i change the camera color seeting to have good quality picture.
i burn to sub woofer 305C pioneer with sir manoj amp and this core in one time.
can you please say to me orighinal core wight ?
Hi,

building a high power smps isn't as easy as making diy amplifiers. it's highly dangerous and lethal damages may be happen to you.

about color , yes , but as i mentioned between original and fake one is some differences in color (Glossy Red/Clear--Bright Red/Gray).
look at this :

Irvynejay Quote

burning a woofer sometimes happen due to pushing clipping power into speaker. it's not a normal burning because your amp's power were below 50w !
I suggest you to using at least a dc protect.

about core weight , i've just checked micromtals software and i found 0.047Lbs which is about 21.31 grams.

Regards,
IRSound

Last edited by IRSound; 18th December 2012 at 09:13 PM.
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Old 19th December 2012, 07:57 AM   #198
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SMPS in progres with 2 transformers from ATX PSU.
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File Type: jpg ATX 2X.JPG (908.1 KB, 828 views)
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Old 19th December 2012, 09:16 AM   #199
manojtm is offline manojtm  India
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Quote:
Core must be micrometals T106-2 with 62 turns 1mm wire and IRFB31N20D
Hi mile,

don't need 50uH for @450KHz cut off freq. will be low as <20KHz.
need 33uH/25uH for 450KHz. for 33uH @50Turns 0.8mm wire.

Regards
MANOJ
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Old 20th December 2012, 11:56 AM   #200
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Quote:
Originally Posted by IRSound View Post
Hi,

building a high power smps isn't as easy as making diy amplifiers. it's highly dangerous and lethal damages may be happen to you.

about color , yes , but as i mentioned between original and fake one is some differences in color (Glossy Red/Clear--Bright Red/Gray).
look at this :

Irvynejay Quote

burning a woofer sometimes happen due to pushing clipping power into speaker. it's not a normal burning because your amp's power were below 50w !
I suggest you to using at least a dc protect.

about core weight , i've just checked micromtals software and i found 0.047Lbs which is about 21.31 grams.

Regards,
IRSound
thanks friend
my core is the color full core not clear core
the clear core was be in here but when we use that it was heet up and can not touch that after only 3 minets
my sub woofer work and bourn
not for the cliping
it was power
i find a transformer with power ampers and sir manoj amp will bourd it beacuse it was power full than other amp i have
thanks for your helping friend
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