Class D Amp with LM566, LM393 and 2XIRF530

[manojtm]

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

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]

Thanks Apex ,

Hi Manoj ,

+/-40V Power True RMS is 88W 8R load

please share with us , how we can calculate output power with other voltages..

Regards

 

[Hadighorbani]

sir mile
what is the problme in my D200 board ?

 

[apexaudio]

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]

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]

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

 

[Hadighorbani]

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

 

[Hadighorbani]

thanks sir manoj

 

[IRSound]

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

 

[manojtm]

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

 

[apexaudio]

D200 +/-75V

With +/-75V DC rail voltage 2k2/2W are very hot, but it's ok. BD241C must have heatsink.

 

[IRSound]

Mile ,

This is your own amp ?
which mosfet did you use for +/-75v ? how was the sound and quality then ?
it's beter to use 3W instead of 2W !

i found some amps on Russian language forums , with LM311 instead of TL081 and some difference in design , did you see them ?

 

[apexaudio]

Mile ,

This is your own amp ?
which mosfet did you use for +/-75v ? how was the sound and quality then ?
it's beter to use 3W instead of 2W !

i found some amps on Russian language forums , with LM311 instead of TL081 and some difference in design , did you see them ?

I use IRF640N for test with 8 ohms speaker, sound is hi-fi quality and mosfets is just warm without heatsink (work at over 100W ).
Russian amp is UCD topology and D200 is IRAUDAMP1 topology.

 

[Hadighorbani]

Hi
can you use D200 for subwoofer without problem ?

 

[IRSound]

Russian amp is UCD topology and D200 is IRAUDAMP1 topology.

Thanks Mile ,
where can i find difference between this two topologies ? I really want to understand how they work...but i cant find a short and good article about this..if you don't mind , please give me some lessons.

i'm going to build this amp , as soon as possible !!

Regards,
IRSound

 

[exflaco]

Irsound could share these russian page links? thanks.

 

[apexaudio]

Hi
can you use D200 for subwoofer without problem ?

Yes, sound is very powerfull on sub.

 

[IRSound]

Irsound could share these russian page links? thanks.=

Hi Exflaco , i found that picture in google image search. i don't remember which forum was it.

but i think mile upload their schematic before. LM311+74AC00+IR2110
he changed modulator section with mackie. i upload those schematics for you.
why you aren't try D200 ?

mile , i forgot to ask another question..why you aren't put large electrolyt capacitor behind fets ? because of bus pumping effect..IRF always use this caps in their designs. or other project like irs series , etc.

Regards,
IRSound

 

[Hadighorbani]

Hi sir mile

Yes, sound is very powerfull on sub.

Hi
please share a very good quality picture from your amp
i want chek your amp parts and my amp too
maybe i have problem in filter zone. right ?
thanks

 

[apexaudio]

Hi Exflaco , i found that picture in google image search. i don't remember which forum was it.

but i think mile upload their schematic before. LM311+74AC00+IR2110
he changed modulator section with mackie. i upload those schematics for you.
why you aren't try D200 ?

mile , i forgot to ask another question..why you aren't put large electrolyt capacitor behind fets ? because of bus pumping effect..IRF always use this caps in their designs. or other project like irs series , etc.

Regards,
IRSound

With my PCB design no need for large electrolyt capacitor behind fets on pcb just in PSU, and I use 470nF and 2X 220nF on pcb.
Regards