My class D amp

ChingTan · 2013-02-20 8:04 am

hello manojtm what is max rail voltage of this amp?
and what is the max watts this amp can give?

akraj · 2013-02-20 10:43 am

Hi Manoj:

I have rectified the issue. Beside I tried to include 12V BIAS regulator in the amp board.

Can you please check whether it is okay or not?

Thanks
Raj

akraj · 2013-02-20 11:04 am

manojtm said:
Hi Raj,

T157-2 i purchased from amidon inc. USA 20pcs @INR-6,050.00

This is the best core suited for AUD600

Regards
MANOJ

Hi Manoj:

are they fake?

Find All China Products On Sale from Dong Guan Yang Tong electronics CO.,LTD on Aliexpress.com - MICROMETAL IRONG POWED CORE t157-2,T157-2MICROMETAL IRONG POWED CORE Free shipping,Promotion T157-2 Irong ferrite and more

Thanks
Ran

ChingTan · 2013-02-21 2:26 am

i'm not an expert but it looks like fake to me the color is bright red unlike the original color is dark red
my friend already try bright red t-130-2 it heat that cannot touch it when he buy original with color dark red the heating is gone

andrewlebon · 2013-02-21 2:33 am

using T157-2 @40uH coil.Perfect for LF MID & HF crystal clear sound fsw @213KHz, No other nois
HAVE you tried any other core the core that detex audio uses
warm regards
andrew lebon

manojtm · 2013-02-21 3:04 pm

HAVE you tried any other core the core that detex audio uses
warm regards
andrew lebon

Hi andrew,

tested with ETD29 @23turns 1mm gap all,
Result EMI little high, LOW and MID best HF good. full volume(1v1 pp signal) MOSFET little HOT(55degree @30min. test)and coil hot @40degree. +/-75V supply full drive down to +/-73V

tested with 157-2 core @52turns
EMI Very low, LF,MID & HF best @full drive no heat coil and MOSFET 30min test.+/-75V supply full drive down to +/-73.6V

Regards
MANOJ

andrewlebon · 2013-02-21 3:10 pm

Hi Manojtm
greetings do you have any simple audio limiter circuit in which output voltage can be set
warm regards
andrew lebon

manojtm · 2013-02-21 4:01 pm

greetings do you have any simple audio limiter circuit in which output voltage can be set
warm regards

Hi andrew,

use this
http://www.diyaudio.com/forums/clas...00-watts-using-2-mosfets-293.html#post3252679

Regards
MANOJ

akraj · 2013-02-22 4:22 am

mrching said:
i'm not an expert but it looks like fake to me the color is bright red unlike the original color is dark red
my friend already try bright red t-130-2 it heat that cannot touch it when he buy original with color dark red the heating is gone

Thanks, I also felt like that.

Later i contacted with INFANTRON (S) PTE LTD, I guess they are reliable.

pravpa · 2013-02-22 8:17 am

akraj said:
Thanks, I also felt like that.

Later i contacted with INFANTRON (S) PTE LTD, I guess they are reliable.

Will T200-2 serve the purpose???
Plz Check on this http://www.cds.co.za/store/T200

akraj · 2013-02-22 8:23 am

pravpa said:
Will T200-2 serve the purpose???
Plz Check on this Ferrite - T200-2

I guess it will.

freestyle · 2013-02-22 9:52 am

manojtm said:
Hi andrew,

tested with ETD29 @23turns 1mm gap all,
Result EMI little high, LOW and MID best HF good. full volume(1v1 pp signal) MOSFET little HOT(55degree @30min. test)and coil hot @40degree. +/-75V supply full drive down to +/-73V

tested with 157-2 core @52turns
EMI Very low, LF,MID & HF best @full drive no heat coil and MOSFET 30min test.+/-75V supply full drive down to +/-73.6V

Regards
MANOJ

sir MANOJ, what is the size of the magnetic wire for ETD29. Thanks,
freestyle

manojtm · 2013-02-22 2:58 pm

sir MANOJ, what is the size of the magnetic wire for ETD29.

Hi freestyle,

0.8mm wire

Regards
MANOJ

akraj · 2013-02-23 8:56 am

manojtm said:
Hi freestyle,

0.8mm wire

Regards
MANOJ

Hi Manoj:

Would you please let me know the way to use ETD39 core for aud600 ver1.0?

I cannot find ETD29 locally and trying to bring ring core from foreign but that is time consuming and complex.

Thanks
Raj

manojtm · 2013-02-23 9:12 am

Hi Raj,

find EPCOS sotre

ETD39 you can use @23Turns 1mm gap all

Regards
MANOJ

manojtm · 2013-02-23 9:21 am

Hi Raj,

you have ETD39(N87) center 1mm gap one, use 15Turns only @45uH

Regards
MANOJ

manojtm · 2013-02-25 11:26 am

Hi All,

Any suggestion for this.

anyone tested like this .it will work or not if i go with HCPL0723???

Regards
MANOJ

manojtm · 2013-02-28 5:54 am

Hi, ALL

pls comment

Regards
MANOJ

akraj · 2013-02-28 6:18 am

manojtm said:
Hi, ALL

pls comment

Regards
MANOJ

This is very cleaver design. However, mounting in box may be difficult. What is the rail voltage? and what FET you are using?

Thanks
Raj

manojtm · 2013-02-28 9:28 am

This is very cleaver design. However, mounting in box may be difficult. What is the rail voltage? and what FET you are using?

Hi Raj,

Vertically mounting. 5mm thick aluminium and 3 inch Hight,6.5 inch length
+/-75V 10A DC rail and FET used IRFP250N fsw@250KHz. OC protect @18A

Regards
MANOJ

My class D amp

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