500W PA amplifier with Limiter

[irwanks]

What power is your 12 inch speakers?

What is the max voltage for b500 with single pair transistors, Sir? I want to try build it. Thank you very much sir

 

[shreya]

Hi Mile sir

can i use 0.25ohms 5watt resistors instead of 0.33ohms 5watt

and any replacements for MJE 340&350

Thank you

 

[ChingTan]

D500 class D PA Amplifier output stage.

is this for diy sir?

 

[shreya]

Apex B500

will it give 300watt RMS at 4r with 48vac 10A transformer?

can i use 0.25ohms 5watt resistors instead of 0.33ohms 5watt

and any replacements for MJE 340&350

 

[AndrewT]

work it out.

 

[wattaniya]

hi apex sir,
b500 with 5 pair output. any mistakes pls let me know.

 

[AndrewT]

Shreya sent me a PM saying "How".

I had to ask How - What?
It turns out he was referring to post 1825 but did not bother to tell me that even when I took the time to answer his PM and ask for clarification.

Today I have stumbled upon "work it out" and now realise I was wasting my time posting
http://www.diyaudio.com/forums/solid-state/164208-500w-pa-amplifier-limiter-36.html#post2775301

It appears Shreya can't be bothered to read this thread. Not even just 3 weeks ago!!

Shreya, don't ask me for anything again, not privately, not here.

 

[TonyLalay]

Hi mr Apex, do you have Audio input incator, i will use the incator for B500..thank verymusch

 

[TonyLalay]

Hallo mr Apex, do you have Audio input indicator for B500..thank you verymuch mr Apex..

 

[comasus]

B500

PCB done

 

[soerdjanto]

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An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[irvynejay]

good business i hope TS has share for this

 

[TonyTecson]

@soerdjanto,

do you have prpfile drawing of your heatsink that you can send me please? are those local extrusions? how much di it cost you per kilogram?

thanks.😀

 

[comasus]

APEX B500

components placed and ready to the test

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ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting

 

[comasus]

APEX B500

Sound is nice,no noise but getting very low sound

Bias is 4.5mv at 0.33R may be 13mA each output

DC offset is 5mv

I have used 2sc4793 2sa1943 instead of all mje's and R4-47K,R22-1k

PSU: 50-0-50 AC (two 25-0-25 in series) 10A=====72-0-72 dc at 20,000uf total

I have used mobile phone as input (350mV)

but sound is very low,when i measured output with multimeter its getting 16v RMS only

Is this normal?

 

[apexaudio]

Sound is nice,no noise but getting very low sound

Bias is 4.5mv at 0.33R may be 13mA each output

DC offset is 5mv

I have used 2sc4793 2sa1943 instead of all mje's and R4-47K,R22-1k

PSU: 50-0-50 AC (two 25-0-25 in series) 10A=====72-0-72 dc at 20,000uf total

I have used mobile phone as input (350mV)

but sound is very low,when i measured output with multimeter its getting 16v RMS only

Is this normal?

You need preamp (5X gain), 350mV is to low for full power.

 

[TonyTecson]

Sound is nice,no noise but getting very low sound

Bias is 4.5mv at 0.33R may be 13mA each output

DC offset is 5mv

I have used 2sc4793 2sa1943 instead of all mje's and R4-47K,R22-1k

PSU: 50-0-50 AC (two 25-0-25 in series) 10A=====72-0-72 dc at 20,000uf total

I have used mobile phone as input (350mV)

but sound is very low,when i measured output with multimeter its getting 16v RMS only

Is this normal?

yes, you have a gain of x45, a 1volt input should drive your amp to almost clipping.

 

[gooseneck]

Soerdjanto, Sir you have plenty of nice PCBs....is this for sale....? can i bought 4 pcs of B500 PCBs from you...? pls. reply... benny

 

[comasus]

You need preamp (5X gain), 350mV is to low for full power.

Ok sir

Thanks for your reply

I will test this amp in line level

what happens if I decrease the value of R22

and when R4 increases gain increases ?

 

[apexaudio]

Ok sir

Thanks for your reply

I will test this amp in line level

what happens if I decrease the value of R22

and when R4 increases gain increases ?

Replace R2, use 1k instead 10k and gain will increase.