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Class D Switching Power Amplifiers and Power D/A conversion

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Old 4th March 2013, 08:32 PM   #411
PetruV is offline PetruV  Romania
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Ok i will go with d200.2 with irfb4229 at 90v for 500w at 4 ohms,will it work with 2 ohms with these but its not very necessary to work at 2 ohms
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Old 4th March 2013, 10:24 PM   #412
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Originally Posted by PetruV View Post
Ok i will go with d200.2 with irfb4229 at 90v for 500w at 4 ohms,will it work with 2 ohms with these but its not very necessary to work at 2 ohms
Use +/-75V for 500W at 4 ohms.
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Old 5th March 2013, 12:11 AM   #413
abetir is offline abetir  Philippines
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Thank you sir mile, I will be posting my build soon...

A few clarifications;

D200 to D200v2
BD241C = IRF640(?)
BAT85 = 1N4148
12vz = 15vz

Is this correct?

Regards!
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Old 5th March 2013, 12:21 AM   #414
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Originally Posted by abetir View Post
Thank you sir mile, I will be posting my build soon...

A few clarifications;

D200 to D200v2
BD241C = IRF640(?)
BAT85 = 1N4148
12vz = 15vz

Is this correct?

Regards!
Yes, but both values will be ok.
Regards
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Old 5th March 2013, 04:10 AM   #415
manojtm is offline manojtm  India
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Quote:
Use +/-75V for 500W at 4 ohms.
Hi mile,

+/-75V DC True RMS is 707W @4R and FTC is 1406W @4R is it correct

Regards
MANOJ
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Old 5th March 2013, 10:37 AM   #416
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Originally Posted by manojtm View Post
Hi mile,

+/-75V DC True RMS is 707W @4R and FTC is 1406W @4R is it correct

Regards
MANOJ
Yes, if you get +/-75V (150V peak to peak) without cliping on amplifier output.
Regards
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Old 5th March 2013, 03:57 PM   #417
PetruV is offline PetruV  Romania
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What will i get if i use 90v,will it pop, also is i use IRFB4332 will it work ok at 90v at 4ohms,and as a question will it work at 2 ohms

Last edited by PetruV; 5th March 2013 at 04:17 PM.
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Old 5th March 2013, 04:43 PM   #418
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What will i get if i use 90v,will it pop, also is i use IRFB4332 will it work ok at 90v at 4ohms,and as a question will it work at 2 ohms
I suggest you to use IRFB4332 with +/-90V at 4 ohms load and test D200 at full power, also with 2 ohms load, and after test please share your exspirience in this thread.
Regards
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Old 5th March 2013, 04:51 PM   #419
PetruV is offline PetruV  Romania
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Originally Posted by apexaudio View Post
I suggest you to use IRFB4332 with +/-90V at 4 ohms load and test D200 at full power, also with 2 ohms load, and after test please share your exspirience in this thread.
Regards
i dont have testing things like multimeter or ociloscope ,i only have computer,soldering iron and only speakers that cant handle more than 50w and no dummy loads.If you say it wont blow up with 4332 and 90v,i will slowly buy the parts and assemble them,but i also need to find a smpsu schematic and pcb without special or expensive parts
Im more than happy to share the results after i build it
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Old 5th March 2013, 05:44 PM   #420
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A basic rule of thumb for class d is that if you don't have an oscilloscope, do NOT build a class d amp!! Especially not one that exceed a few watts of power.

To build a class D amp, a Oscope is a must!! It's a requirement!! Without it you cannot verify the amp is working properly and doing what its supposed to do.

You need to be able to verify that it is switching properly without excessive ringing (caused by excess stray inductance) and not just oscillating wildly all over the place.
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