ucd 25 watts to 1200 watts using 2 mosfets

[NMOS]

Originally Posted by akraj

Any comment!

Corrected few missing tracks and on board BIAS regulator!

Credit goes to MANOJ!

better use AUD600 Ver 3.0

[akraj]

Originally Posted by NMOS

better use AUD600 Ver 3.0

Yes, I may go for new version. But what would the noticeable difference between these two?

Thanks in advance NMOS?

[luizcpimenta]

Originally Posted by akraj

Yes, I may go for new version. But what would the noticeable difference between these two?

Thanks in advance NMOS?

Good evening to all.
Can someone send me the files of version 3 of AUD600?

Thank you all.

luizcpimenta@yahoo.com.br
luizcpimenta@gmail.com

[PetruV]

What design would you recomend for 700w at 4 ohms and also has a low part count and pcb and dosent need expensive parts

[akraj]

Originally Posted by PetruV

What design would you recomend for 700w at 4 ohms and also has a low part count and pcb and dosent need expensive parts

AUD600, contact with Manoj.

[norazmi]

tested today irs900D, run with +- 47.6 vdc, mosfet irf540, gate resistor 33 ohm and 1n5819, pushing hard no porblem, 3.3k 2w feed with 5.6v zener diode for that voltage, the value may vary for high voltage. using car amp toroid 22 uh awg 16 and filter cap .68uf , coil with 1.3mm air gap no heating at all with full blast.

regards
Azmi.

[pravpa]

Originally Posted by norazmi

tested today irs900D, run with +- 47.6 vdc, mosfet irf540, gate resistor 33 ohm and 1n5819, pushing hard no porblem, 3.3k 2w feed with 5.6v zener diode for that voltage, the value may vary for high voltage. using car amp toroid 22 uh awg 16 and filter cap .68uf , coil with 1.3mm air gap no heating at all with full blast.

regards
Azmi.

CONGRATULATIONS...!!!!!
Its amazing...

[PetruV]

Can you show me some AUD600 schematics,and a pcb,so i can see if its suitable

[lorylaci]

Originally Posted by highand

Simple D class amplifier non smd part, without feedback.

http://www.hobbielektronika.hu/forum....php?id=191446

http://www.hobbielektronika.hu/forum....php?id=191441

Just for the record, since few of them here can understand hungarian. (Highand I reccomend you to post a google translated link of the HE forum, so others can see the discussion),
I (and others) doubt the performance characteristics of this amp, as stated by Highand.

It has lot of issues, for example but not all:
- P channel FETs have bad diode, high Coss realteive to their high Rdson, due to material science reason (hole conductivity vs. electron cundictivity). They won't be so much beter, however N channel FETs have improved gradually, and they are still improveing.
Although Highand stated that schematic can be modified to all N-channel, then It looses all the pros Highand state.
Even though Highand stated, and simulations show that diode recovery lossses are decreased, I state that they are still higher than using modern all N-channel FETs. (also the zeners applied to to this "trick", dissipate much, so total some of dissipiation is not decreased so IMHO).
- lack of feedback gives absolutely no control about the output LC filter, it does not supress distortions in the half bridge (they exists and they are not neglictable, just see an IRF Class-D application note), and also does not suppress power rails variations.
Since Class-D gain is dependent on supply voltage, any ripple the supply has, or any decrease the supply has at high output pulses, it will show on the output.
- In a normal Class-D amp designers all do everything to make the amp produce as high and as low duty cycles as it is possible, to make as much ourput as possible from the same supply and the same votlage rating FETs, before the modulation error kicks in. Higher votlage rating FETs are always worse, or more expensive (if they have the same good specs). In this design the duty cycle must be limited due to the applied gate driving network. This is not a trick, this is absolutely bad design goal IMHO.

These and other issues are discussied in the Hungarian forum.

[NMOS]

Originally Posted by IRSound

Hi guys..

so I've just finished IRS1500..but there is also a problem

please watch this video :

Class-D IRSD1K5 - No & Low Level input Problem - YouTube

when i turn on power supply..after s short delay , speaker connected to amp's out. as you can hear in video , there is a noise available at output. (input volume = 0) and when i increase volume up to 4~5%, a really bad audio signal become appear. also the active led indicator isn't bright constantly.
when i increase the volume (about 7~8 %) the amp start to oscillate and those problem solved.

guys please help me. anyone have similar problems ?

Regards,
IRSound

Does the amp start to oscillatenn with low level input signal and the noise gone ?

I want to know is those problem solve now ?