Class D Amp with LM566,LM393 and 2XIRF530 - Page 39

apexaudio · 23rd February 2013, 02:58 PM

Quote:

Originally Posted by suryadi5417

just for testing i'm using 42v dc.

It's over 100W at 4R load with +/-42V DC.

krakow · 23rd February 2013, 04:57 PM

Quote:

Originally Posted by suryadi5417

my caps 0,47uF and 0,22uF with no brand, i think from china.
Regards

Ok Thanks

suryadi5417 · 23rd February 2013, 08:27 PM

Quote:

Originally Posted by apexaudio

It's over 100W at 4R load with +/-42V DC.

Alright sir ,i will down the voltage for the test. To get 400 watts at 4 ohms, what is needed? how many volts and how many watts transformer should I give this amplifier?

Regards.

krakow · 23rd February 2013, 11:53 PM

I want to supplied my amp about 2*40v.
So with 2*30v transfo it's ok (30*1.414=42.5v)(42.5-2.4=40v) 2.4 is the loss in the diode bridge.
But I have a problem to select the power of the transfo !
I think 200W it's ok because the amp can "give" 100W+ the heat loss (30w)+the loss in transfo(40w)=170w (30w of margin).

What do you think ?

apexaudio · 25th February 2013, 06:42 AM

Quote:

Originally Posted by krakow

I want to supplied my amp about 2*40v.
So with 2*30v transfo it's ok (30*1.414=42.5v)(42.5-2.4=40v) 2.4 is the loss in the diode bridge.
But I have a problem to select the power of the transfo !
I think 200W it's ok because the amp can "give" 100W+ the heat loss (30w)+the loss in transfo(40w)=170w (30w of margin).

What do you think ?

Heat loss must be under 10W, but 200W is ok.

krakow · 25th February 2013, 10:23 AM

Ok, thanks

Regards

PetruV · 26th February 2013, 08:35 PM

for apex d200 what trafo and what transistors for 500-700w

apexaudio · 28th February 2013, 09:33 AM

Quote:

Originally Posted by PetruV

for apex d200 what trafo and what transistors for 500-700w

D200 is 200W amplifier.

PetruV · 28th February 2013, 07:01 PM

Quote:

Originally Posted by apexaudio

D200 is 200W amplifier.

I seen the d500 but its too complex i want something like d200 but 500-700w

krakow · 28th February 2013, 09:39 PM

Quote:

Originally Posted by PetruV

I seen the d500 but its too complex i want something like d200 but 500-700w

The D200 was designing for 200W, if you want 500W you must remake all the design.
And 500W is a very high power, it must have many security control.
The D500 is not so complex in front of D200 and it was design for 500W !

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23rd February 2013, 11:53 PM	#384
krakow diyAudio Member Join Date: Feb 2013	I want to supplied my amp about 240v. So with 230v transfo it's ok (30*1.414=42.5v)(42.5-2.4=40v) 2.4 is the loss in the diode bridge. But I have a problem to select the power of the transfo ! I think 200W it's ok because the amp can "give" 100W+ the heat loss (30w)+the loss in transfo(40w)=170w (30w of margin). What do you think ?

25th February 2013, 10:23 AM	#386
krakow diyAudio Member Join Date: Feb 2013	Ok, thanks Regards

26th February 2013, 08:35 PM	#387
PetruV diyAudio Member Join Date: Dec 2012 Location: Bucuresti	for apex d200 what trafo and what transistors for 500-700w