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Old 3rd March 2013, 08:58 PM   #3321
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by akraj View Post
Any comment!

Corrected few missing tracks and on board BIAS regulator!

Credit goes to MANOJ!
better use AUD600 Ver 3.0
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Old 3rd March 2013, 09:45 PM   #3322
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by NMOS View Post
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?
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Old 3rd March 2013, 09:50 PM   #3323
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Quote:
Originally Posted by akraj View Post
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
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Old 8th March 2013, 05:44 PM   #3324
PetruV is offline PetruV  Romania
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What design would you recomend for 700w at 4 ohms and also has a low part count and pcb and dosent need expensive parts
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Old 9th March 2013, 03:21 AM   #3325
akraj is offline akraj  Bangladesh
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Originally Posted by PetruV View Post
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.
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Old 9th March 2013, 11:34 AM   #3326
norazmi is offline norazmi  Malaysia
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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.
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Old 9th March 2013, 02:29 PM   #3327
pravpa is offline pravpa  India
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Quote:
Originally Posted by norazmi View Post
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...
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Old 10th March 2013, 08:42 AM   #3328
PetruV is offline PetruV  Romania
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Can you show me some AUD600 schematics,and a pcb,so i can see if its suitable
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Old 10th March 2013, 09:07 AM   #3329
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Quote:
Originally Posted by highand View Post
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.
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Old 13th March 2013, 02:52 PM   #3330
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by IRSound View Post
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 ?
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