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Old 3rd January 2013, 11:27 AM   #221
manojtm is offline manojtm  India
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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
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Old 3rd January 2013, 12:20 PM   #222
IRSound is offline IRSound  Germany
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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
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Old 3rd January 2013, 06:00 PM   #223
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sir mile
what is the problme in my D200 board ?
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Old 3rd January 2013, 07:16 PM   #224
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Quote:
Originally Posted by Hadighorbani View Post
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.
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Old 4th January 2013, 06:15 AM   #225
manojtm is offline manojtm  India
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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

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MANOJ
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Old 4th January 2013, 06:48 AM   #226
manojtm is offline manojtm  India
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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

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MANOJ
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Old 4th January 2013, 07:36 AM   #227
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Quote:
Originally Posted by apexaudio View Post
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
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Old 4th January 2013, 07:42 AM   #228
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thanks sir manoj
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Old 4th January 2013, 11:09 AM   #229
IRSound is offline IRSound  Germany
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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
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Old 4th January 2013, 01:23 PM   #230
manojtm is offline manojtm  India
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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

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MANOJ
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