500W PA amplifier with Limiter

[yosie48f]

hey man is this h900 or b500? wrong thread.

I am sorry, i took this layout on this thread post #598. And just want to say Thank You to Mr. Mile who gave me VALUABLE things. once again i'm Thank You so much Mr.Mile.....Regards
yosie48f

 

[apexaudio]

apex sir thanks for ur reply.
without power transistors can i give dc 80v to check b500.
what are the main places to check the voltages.
dc offset below 100mv. is it ok?

Use 10ohms resistors instead fuses and test amp with outputs transistors.

 

[drowranger]

This is simple XLR input circuit.
I suggest to use 2 way x-over with XLR input, and 3 position switch to select input mode (subwoofer, satelite or full range)
Regards

can you give me the foil pattern of the xlr input circuit?


thanks,
joel

 

[wattaniya]

Use 10ohms resistors instead fuses and test amp with outputs transistors.

hi apex sir.
is it 10ohm resistor 1/4 watt or 1watt?

 

[aman khalsa]

i think u can use 5Watts....

thank u.....

 

[manidecibels]

hi iam mani from banglore...

i want design apex 500 amp pcb do u want ?

you have to share the designing cost....

let me know , call me on +919742775526

 

[ariyanto]

hello apex sir
for stereo can i use this psu for b500 with 55v,0,55vac?

How to lay out the size?
regards

 

[drowranger]

B500 based on schematics of H900, but in AB class.
Power supply +/-90Vmax.

why did you suggest 60vac when its output is only 83v and you suggest for 55vac for safe reason.randy sloan amp is only 85 vdc and its ratings is 550w at 4 ohms and consist of 12 mosfets and yours is only 8 transistor .are your ratings at your amp which is 500 watts is true?can it handle a 90 volt dc like you posted here?i have built randy sloan amp which is optimos and it is very durable and very stable.and its rating is 250w at 4ohms and its power supply is 72vdc.its output has 4 mosfets or 2 pairs and by the way this is another amp im talking different from the one i mentioned first.🙂🙂🙂

 

[wattaniya]

How to lay out the size?
regards

hi ariyanto
did u find the pdf file of this ?
if u found, then directly open in adobe illustrator or photoshop, then print.
if u open in photoshop then give the resolution to 300dpi and choose grayscale., and choose transparent background thats it.

 

[AndrewT]

why did you suggest 60vac when its output is only 83v and you suggest for 55vac for safe reason.randy sloan amp is only 85 vdc and its ratings is 550w at 4 ohms and consist of 12 mosfets and yours is only 8 transistor .are your ratings at your amp which is 500 watts is true?can it handle a 90 volt dc like you posted here?i have built randy sloan amp which is optimos and it is very durable and very stable.and its rating is 250w at 4ohms and its power supply is 72vdc.its output has 4 mosfets or 2 pairs and by the way this is another amp im talking different from the one i mentioned first.🙂🙂🙂

You seem to be the only poster who considers claims at their face value and rightly queries "facts" that might be fiction.

This thread and others have attracted a load of Members who look at the power ratings through rose tinted spectacles, or welding helmet with the 11 filter down and say "I want some of that!!"

 

[wattaniya]

hi apex sir.
today i checked the power supply , it is showing 83v,0,83vdc ,is it ok to use 2.2k resistor for r24,25?

 

[ariyanto]

hi ariyanto
did u find the pdf file of this ?
if u found, then directly open in adobe illustrator or photoshop, then print.
if u open in photoshop then give the resolution to 300dpi and choose grayscale., and choose transparent background thats it.

yes thank you I understand??

 

[wattaniya]

pls help
i changed the burned parts and i checked fuses with 83vdc, but 2.2k resistor r24 and 25 getting hot.
i checked with the other transformer with 52vdc same problem.
pls help.

 

[apexaudio]

pls help
i changed the burned parts and i checked fuses with 83vdc, but 2.2k resistor r24 and 25 getting hot.
i checked with the other transformer with 52vdc same problem.
pls help.

It's OK, R24,25 must be hot, but you can use 3k3 with +/-83V.

 

[wattaniya]

It's OK, R24,25 must be hot, but you can use 3k3 with +/-83V.

hi apex sir .
today i changed r24,r25 to 3.3k 2w but same problem getting very hot.
in the power supply unit the 12k 2w resistors also getting very hot.
what is the reason for this?
power supply check the image.

 

[apexaudio]

hi apex sir .
today i changed r24,r25 to 3.3k 2w but same problem getting very hot.
in the power supply unit the 12k 2w resistors also getting very hot.
what is the reason for this?
power supply check the image.

 

[wattaniya]

hi apex sir .
i dont know mathematics, so if u can give one example i can understand.

 

[AndrewT]

lower left corner.
You have V = voltage = I*R = P/I = sqrt[P*R]

Similarly for the other four quadrants.

 

[khalsa]

nazirdigi use 5W

 

[wattaniya]

lower left corner.
You have V = voltage = I*R = P/I = sqrt[P*R]

Similarly for the other four quadrants.

thanks, but i cant understand.