Class D Amp with LM566,LM393 and 2XIRF530
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 Class D Switching Power Amplifiers and Power D/A conversion

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manojtm
diyAudio Member

Join Date: Aug 2008
Location: KERALA
Quote:
 With +/-40V power is 80W/8 Ohm load without heatsinks on IRF640 (about 300W/2 Ohm load)
Hi mile,

+/-40V Power True RMS is 88W 8R load
FTC (sqr root(200x8)=40v) is 200W 8R load

Quote:
 D200 work perfect with inductor from BEHRINGER class D amp, core with 1mm gap and 15 turns.
is it ferrite core?? size??

Regards
MANOJ

IRSound
diyAudio Member

Join Date: Feb 2012
Thanks Apex ,

Hi Manoj ,

Quote:
 +/-40V Power True RMS is 88W 8R load
please share with us , how we can calculate output power with other voltages..

Regards

 3rd January 2013, 06:00 PM #223 Hadighorbani   diyAudio Member   Join Date: Jun 2010 sir mile what is the problme in my D200 board ?
apexaudio
diyAudio Member

Join Date: Feb 2010
Location: Serbia
Quote:
 Originally Posted by Hadighorbani sir mile what is the problme in my D200 board ?
I can't tell you without tests and measurement, but try it without O/C protect if you can't find 0,05R/5W resistor.

manojtm
diyAudio Member

Join Date: Aug 2008
Location: KERALA
Quote:
 please share with us , how we can calculate output power with other voltages..
Hi ALL

(RMS)FTC calculation is V^2/R=P

ie, 40^2/8= 1600/8=200W RMS

True RMS Calculation is [V/(2xsqroot2)]^2/R=P
(+)40V+(-)40V = 80V(total)
[80/3]^2=710.93/8=88.8W RMS

Regards
MANOJ

manojtm
diyAudio Member

Join Date: Aug 2008
Location: KERALA
Quote:
 True RMS Calculation is [V/(2xsqroot2)]^2/R=P (+)40V+(-)40V = 80V(total) [80/3]^2=710.93/8=88.8W RMS
Hi ALL

actual value for 2x Root 2 = 2.828 so i round to 3

with actual [80/2.828]^2=800/8=100W RMS

Regards
MANOJ

diyAudio Member

Join Date: Jun 2010
Quote:
 Originally Posted by apexaudio I can't tell you without tests and measurement, but try it without O/C protect if you can't find 0,05R/5W resistor.
hi
i am using 0.1 ohm now for test but nothing change
thanks

 4th January 2013, 07:42 AM #228 Hadighorbani   diyAudio Member   Join Date: Jun 2010 thanks sir manoj
 4th January 2013, 11:09 AM #229 IRSound   diyAudio Member   Join Date: Feb 2012 Thanks Manoj , is there any difference in output power if we use regulated or unregulated smps for this amps ? because mile said that. (in example of XLS1500 amp) generally , i want to know how much the type of power supply can change the output power... Regards, IRSound
 4th January 2013, 01:23 PM #230 manojtm   diyAudio Member     Join Date: Aug 2008 Location: KERALA Hi IR, if you are using unregulated PS check voltage with maximum power then calculate with that voltage(normally 4.5V difference) .and i think all speakers are FTC RMS rated one not true RMS Regards MANOJ

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