900W H-class PA Amp with Limiter

[ynopac]

happy newyear

 

[stewin]

hi all my layout of apex h with transitor drive please check and add comments or compliments

 

[stewin]

more renders

 

[rohin]

more renders

without ir 2117 good circuit.but you should also change nsl32 because it is rare too and if you are doing hard work for diyer and making this in 2015 then you should aware of available parts in 2015.good work.

 

[daveinsingapore]

NSL32

without ir 2117 good circuit.but you should also change nsl32 because it is rare too and if you are doing hard work for diyer and making this in 2015 then you should aware of available parts in 2015.good work.

Hey bro I have some NSL32's in stock...do you want some...I am in Singapore

 

[wattaniya]

hi dave, i need nsl32 can u send?

 

[daveinsingapore]

sorry I never saw your previous messages...have not opened this message box for a long time...ok I see your address will send you a couple ok

 

[rohin]

apex h900 in case and showing his power

east and west
apex h900 topology is best
leave the rest
bass response is good pounding the chest
if don't believe make yourself then test
its never behind from crest
apex sr200 is my next

 

[apexaudio]

east and west
apex h900 topology is best
leave the rest
bass response is good pounding the chest
if don't believe make yourself then test
its never behind from crest
apex sr200 is my next

Nice work,
Regards

 

[Parag99]

Sir Mile i have 2 questions for u:
1: do 4 pairs at the output stage are enough to drive 4ohm load at full power keeping in mind that they are powered with 120vdc..no need for extras?
2: the swithching between 50v to 120v is fast enough with no distortion between switching?
Thank u...

 

[stewin]

hi sir apex can the 500 ab amp be converted to class td or hd the way you converted it to class h??

 

[apexaudio]

hi sir apex can the 500 ab amp be converted to class td or hd the way you converted it to class h??

Yes

 

[andrewlebon]

Hello Apexaudio
greetings very kind of you for posting schematic
warm regards
Andrew

 

[stewin]

thanks sir apex . how many watts can it deliver?

 

[rohin]

hi apex sir,i don't want to hear bass under 50hz because i don't like it.is there any circuit?thanks.

 

[apexaudio]

hi apex sir,i don't want to hear bass under 50hz because i don't like it.is there any circuit?thanks.

There is low cut filter on BA1200 XLR input circuit.

 

[AndrewT]

hi apex sir,i don't want to hear bass under 50hz because i don't like it.is there any circuit?thanks.

There is low cut filter on BA1200 XLR input circuit.

Just adjust the component values of the Passive RC input filter.

But have you investigated whether it is your speakers that create the "unpleasant" bass?

Very many commercial speakers are designed to give a "more bass effect" than their small size is capable of.

This "effect" is achieved by setting the speaker Q to a value higher then 0.7, sometimes higher the Q>=1
This gives a very "unreal" sound than many listeners do not like.
It would be worth experimenting to try to find out what it is that you find "unpleasant".

 

[apexaudio]

Low cut 12dB/oct at 35hz, use 330nF or 220nF for 50Hz or higher cut.

 

[rohin]

Low cut 12dB/oct at 35hz, use 330nF or 220nF for 50Hz or higher cut.

thanks, i like to say h900 sound quality is best from many professional amp.

 

[starvox]

working stepdrive

yes QQ12e5k1 made this and i build this to prove and share th
this is my first post in this forum. i've been reading topics here for sometime and this captured my interest. is this stepdrive circuit working, no issues of rail sticking or any problems encountered. i am planning to revive my mobile sounds and i'm planning to use this amp for low frequency application. looking forward to any replies on my querry. thanks in advance.