My class D amp

[srinath]

Give me details

Hi Manoj,
Please give me more details.
You said it is 1000 watts - now is it stereo or mono ? Sorry I didn't read the whole thread.
You have said the voltage is 45V - is that AC or DC. Now you said you reduced it from 75 to 45. I am rewinding a Microwave transformer, so I can do either, just need a ampere rating.
Let me look through the thread for all other information. And I saw you said it sounds great. Compare the type of sound to something I might know - I have lots of vintage pioneer, marantz, yamaha etc etc. I also have listened to a bunch of newer receivers. Yamaha DSP3090 etc etc.
So You could say its like a pioneer sx 880 but has more power. That would be fine.

And how much shipped to USA.

Thanks.
Srinath.

 

[NMOS]

Hi srinath,

Yes.

Regards
MANOJ

Im interested to buy, how much to europe ?

 

[paskal9]

Hi andrew,

thanks. sound quality and power is good compare with T157-2 and very very low RF noise
Disadvantage is it will warm like 55/65 deg. temp with in 25 min. run and fsw will reduced to 280KHz(recheck again due to coil OR 74hc04)

can you tell me where i can get IRFP4227 MOSFET???

Regards
MANOJ

looks like the coilcraft filter don't need as much wire as my current T106-2 toroid. i'm current using 1.5m of magnet wire to get ~21uh of inductance.

mind to share the link to the actual product? there's a lot of ferrite to choose from at the coilcraft website.

 

[nigelwright7557]

Hi andrew,

thanks. sound quality and power is good compare with T157-2 and very very low RF noise
Disadvantage is it will warm like 55/65 deg. temp with in 25 min. run and fsw will reduced to 280KHz(recheck again due to coil OR 74hc04)

can you tell me where i can get IRFP4227 MOSFET???

Regards
MANOJ

I use T106-2 wit has many turns I can get on of 18SWG.

IRFB4227: RS-Components, Farnell.com, Future Electronics.

 

[manojtm]

You said it is 1000 watts - now is it stereo or mono ? Sorry I didn't read the whole thread.
You have said the voltage is 45V - is that AC or DC. Now you said you reduced it from 75 to 45. I am rewinding a Microwave transformer, so I can do either, just need a ampere rating.
Let me look through the thread for all other information. And I saw you said it sounds great. Compare the type of sound to something I might know - I have lots of vintage pioneer, marantz, yamaha etc etc. I also have listened to a bunch of newer receivers. Yamaha DSP3090 etc etc.
So You could say its like a pioneer sx 880 but has more power. That would be fine.

Hi Srinath,

10A +/-45V DC not AC and FTC RMS is 506W @ 4R load not 1000W

i said it was my feel not actual watt

Regards
MANOJ

 

[manojtm]

I use T106-2 wit has many turns I can get on of 18SWG.

IRFB4227: RS-Components, Farnell.com, Future Electronics.

hi nigel,

Coilcraft part no. is VER2923-223KL

I given a purchase order for FDP075N15A_F102 MOSFET(testing for AUD600.) to RS-components

Regards
MANOJ

 

[manojtm]

Im interested to buy, how much to europe ?

Hi Nmos,

Thank you for ordering my AUD600.i am new and i don't know how sell in Europe and USA.
i will ask somebody and do it with the help of courier people.

Regards
MANOJ

 

[srinath]

Hi Srinath,

10A +/-45V DC not AC and FTC RMS is 506W @ 4R load not 1000W

i said it was my feel not actual watt

Regards
MANOJ

Oh, I cant dual wind my transformer - I am still learning how to wind it.
Cool.
Srinath.

 

[akraj]

Hi Nmos,

Thank you for ordering my AUD600.i am new and i don't know how sell in Europe and USA.
i will ask somebody and do it with the help of courier people.

Regards
MANOJ

Can you send to kalkutta or Bangladesh?

 

[Insomnia]

AUD600 Rev3.0 have 3V DC output - not make music

Hi manojtm

Have make AUD600 Rev3.0 but have 3V DC output - no music comes out

look pic PCB and schematic

Is it possibile my schemtic is wrong/ error

it looks like amp start oscillation and ready to work because blue control led is on

but why have 3V DC output with no input signal ?

Is setup instruction available to check faults for first time trouble ?

Mosfet IRF640N
Have try Hex Inverter CD4069 and 74HC04 .... same no music but 3V DC

Any idea or solution ?

 

[nigelwright7557]

Does a music input modulate the square wave into ir2110 ?

 

[manojtm]

Hi Insomnia,

no problem found on your schematic except DC-OFF set. you don't need DC offset control.DC offset down to 1mV-10mV when you change R20 resistor value increase to 10K.and R19 use 2K 1%.
Regards
MANOJ

 

[Insomnia]

Hi Insomnia,

no problem found on your schematic except DC-OFF set. you don't need DC offset control.DC offset down to 1mV-10mV when you change R20 resistor value increase to 10K.and R19 use 2K 1%.
Regards
MANOJ

Hi Manoj

are you sure ?....because R19=2K is for switching frequency and in your schematic its 1K.

Have take Scope

HIN and LIN from IR2110 have signal

Signal from Mosfets out to output Filter show Square Wave

Isi it possibile output Filte have wrong value and I dont have music against output filter problem ?

 

[nigelwright7557]

You need to check if the input signal is modulating the square wave.
Apply a sine wave to check it or even some music.

 

[Insomnia]

You need to check if the input signal is modulating the square wave.
Apply a sine wave to check it or even some music.

> Does a music input modulate the square wave into ir2110

Signal from CD4069 or 74HC04 modulate with music to HIN and LIN from IR2110

But output from Mosfet to output filter show fixed Square Wave.

Is this ok or wrong ?

I can hear very very quiet a little bit music with distortion


Can be output filter wrong or wrong value ?

 

[Insomnia]

> Does a music input modulate the square wave into ir2110

Signal from CD4069 or 74HC04 modulate with music to HIN and LIN from IR2110

But output from Mosfet to output filter show fixed Square Wave.

Is this ok or wrong ?

I can hear very very quiet a little bit music with distortion


Can be output filter wrong or wrong value ?

I forget, the 3 x 1NF capacitor to TL071 are ceramic, is this ok or does oscillator not work with ceramic capacitor

 

[nigelwright7557]

With a large input signal the output should be modulating a lot.

I would check your input signal into the comparator to see if it is big enough.
It will need quite a swing to fully modulate the output.

 

[manojtm]

Hi Manoj

are you sure ?....because R19=2K is for switching frequency and in your schematic its 1K.

Hi,

your schema shows 1K pot with 500R. it will reduce fsw,so that i said use 2k in-lieu of 500R

Regards
MANOJ

 

[akraj]

wow nice work. i am working on combining the main amp and protection in one board. i will use double sided board to reduce emi.
i will post the development later.
i will use irfb4227 as outputs.

Hi stewin: what is the update your AUD 900?

Thanks
Raj

 

[stewin]

i have been caught up with designing a 3" board smps with overcurrent protect, but i am still on aud 900 project

here are the smps plans have fun all diyers