900W H-class PA Amp with Limiter

[event horizon]

Originally Posted by eesbiboi

does that mean, adding more output trannies would increase h900's power output up to such 1200w???... ...

No, not into the same loads - you'll need to increase the rail voltages to increase the power.

Running lower impedance loads (not recommended) you would have increased power output.

[apexaudio]

Originally Posted by event horizon

No, not into the same loads - you'll need to increase the rail voltages to increase the power.

Running lower impedance loads (not recommended) you would have increased power output.

I agree with expirience diyer, I have 2500W amp, but this amp is not for first diy,
Regards

[engel dela pena]

Originally Posted by apexaudio

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 8X10000uF/63V for PSU... are you still interesting to build this amplifier?

mjl4281a are 350v 230w 15a
mjl21193 250v 200w 16a
how about mj15003 250w 140v 20a
and mj15024 250v 250w 16a

[apexaudio]

Originally Posted by engel dela pena

mjl4281a are 350v 230w 15a
mjl21193 250v 200w 16a
how about mj15003 250w 140v 20a
and mj15024 250v 250w 16a

MJ15024/MJ15025 can be used (crown), MJL21193/MJL21194 also.
MJ15003/MJ15004 can be used only for B500 (B250) with +/-65VDC rail voltage.
Regards

[engel dela pena]

Originally Posted by apexaudio

MJ15024/MJ15025 can be used (crown), MJL21193/MJL21194 also.
MJ15003/MJ15004 can be used only for B500 (B250) with +/-65VDC rail voltage.
Regards

mjl4281a are hard to find locally
but mj15025 are already available maybe i'll go for mj15025 next time
250w 250v
what is psu specs for mj15025
transformer ,caps, diode

[apexaudio]

Originally Posted by engel dela pena

mjl4281a are hard to find locally
but mj15025 are already available maybe i'll go for mj15025 next time
250w 250v

No need for MJL4281A, I use it only with higer rail voltage for increase power on 8R load,
Regards

[engel dela pena]

many people making money of assemblying then selling like what you called "monster amp" thats not new here in our place,i'm saying this because i'm one of their victim
they build me monster amp and i pay them,i still remember as they say i will build you a thousand watts amp,he he he.that's the reason why i dig to much of this knowledge and because i'm a victim of people who take advantage to those who knew very little in this field.i'm verry thankful to all the people specially APEX for sharing their knowledge and experience in this field,and support
warm'st regards

[apexaudio]

Originally Posted by engel dela pena

many people making money of assemblying then selling like what you called "monster amp" thats not new here in our place,i'm saying this because i'm one of their victim
they build me monster amp and i pay them,i still remember as they say i will build you a thousand watts amp,he he he.that's the reason why i dig to much of this knowledge and because i'm a victim of people who take advantage to those who knew very little in this field.i'm verry thankful to all the people specially APEX for sharing their knowledge and experience in this field,and support
warm'st regards

Not this "monsters" I mean schematics on the net, but expirience is not for free,
Regards

[engel dela pena]

for clarification
i did not mean your design,
and experience,i can thank them for they fool me once,but because of them i gained experience building my owned stuff,with the help of the community
regards

[apexaudio]

Originally Posted by engel dela pena

for clarification
i did not mean your design,
and experience,i can thank them for they fool me once,but because of them i gained experience building my owned stuff,with the help of the community
regards

It's clear, I mean "monsters" from your post,
Regards