900W H-class PA Amp with Limiter

[sownel]

please post clear photos of your project.

 

[rohin]

Hi sir,rohin
this apex discrete stepper is not working properly,negative side suddenly increased rail

i only post for stewin so that he can examine things for his project.is this design fault or you did something wrong?

 

[rohin]

on which pcb file you made this ? please share that file so we can see if something wrong on pcb layout.

 

[iiee3602]

Gud day sir miles,

Can i use input boad of BA1200 for input of h900?

 

[rohin]

hi everyone can i use 7 pair output transistor with this ef version .if i use preset in place of r22 will it ok or i need to change r23 value too.thanks for your valuable comment.

 

[rohin]

with this ef version.

 

[Chard82]

Hi sir stewin, in your post #3597 can I put resistor in parallel with MUR810 (ex: 10K, 2watts) to serve as load resistance of IRF540 with respect to +MV? this will ensure that the voltage at +DMV will rise close to +HV when IRF540 switches ON. Without load resistance the voltage at +DMV will be undefined due to the collectors of C3856 acting as current sink and the IRF540 as current source in my opinion, am I correct?

 

[moore4889]

hi guys,sir miles

just want to know if i can use the step drive schematics of vertex 3 tier using 0-42-94-142 dc split power supply from jbl mpx1200 transformer with 4 pairs of mjl21195/96 output devices?did someone here try 3 tier supply in h900?hoping somebody can help me this? thanks in advance!!
Merry Christmass and Happy new year to all!!

 

[anand555]

Please check the pcb is this OK or something went wrong please confirm

 

[anand555]

Please help me.
If I have on the power supply then start the burning resistance 100ohms marked as blue suggest me what can I do.

 

[rohin]

Please help me.
If I have on the power supply then start the burning resistance 100ohms marked as blue suggest me what can I do.

check resistance value are you sure there is 100 ohm 2w resistance?

 

[rohin]

Please check the pcb is this OK or something went wrong please confirm

pcb may be not good .

 

[anand555]

Thanks rohin for your reply. if you have corrected pcb layout so, please share with me my mail ID is gunjaudio@gmail.com/ 08318685681 whatsapp me.

 

[pallab]

I will post schematic for PSU and protect soon.
Full power of this amplifier is not 900W. Power with THD 0,5% is 1200W on 4R load, and 1800W on 2R load. Output transistor must be MJL4281A/MJL4302A for maximum power. For step mosfet use IRF2807. MJL21193/MJL21194 can be used for full power on 4R load.
Transformer minimum 1500VA for one channel 4X40V AC + 2X20V for protection circuit. 2X35A bridge and 8X100
00uF/63V for PSU... are you still interesting to build this amplifier?

sir,can I replace 2pair IRF 2807 instead of IRF540??my outputs are MJL4281/4302 total 4 pair.Rail voltage is 4*40v ac..and can i bridge it with this rail voltage ??my subwoofer is 1500watt RMS 8 ohms .is it perfect for my subs??And Thank you for B500 it's nice amp.

 

[apexaudio]

sir,can I replace 2pair IRF 2807 instead of IRF540??my outputs are MJL4281/4302 total 4 pair.Rail voltage is 4*40v ac..and can i bridge it with this rail voltage ??my subwoofer is 1500watt RMS 8 ohms .is it perfect for my subs??And Thank you for B500 it's nice amp.

Yes you can, you can bridge with this rail and 8 ohms load.

 

[masood251]

Dear apex can i use transformer 110..55..0..55..110 volts 10 Amp transformer in this h900 ampl.

 

[rohin]

Dear apex can i use transformer 110..55..0..55..110 volts 10 Amp transformer in this h900 ampl.

yes you can use for one or two seconds.

 

[apexaudio]

Dear apex can i use transformer 110..55..0..55..110 volts 10 Amp transformer in this h900 ampl.

No, with 4 output pair use 80-40-0-40-80vac

 

[anand555]

Dear Apex Sir please check and confirm this layout is correct or need any rectification.

Thanks & Regards
Anand Kumar
cont: +918318685681(India)

 

[masood251]

Dear Apex Sir please check and confirm this layout is correct or need any rectification.

Thanks & Regards
Anand Kumar
cont: +918318685681(India)

nice