900W H-class PA Amp with Limiter

[apexaudio]

ok ty mile pcb almost done,,what about irf540 is it enough for h900 or better to use irf2807?

IRF540 is enough, but IRF2807 is better.

 

[irvynejay]

ok ty ill post picture of my 2 channel h900 for final check psu and protect almost done

does pre driver need to have an heatsink?

ty mile

 

[apexaudio]

ok ty ill post picture of my 2 channel h900 for final check psu and protect almost done

does pre driver need to have an heatsink?

ty mile

Yes heatsink for TO126 case.

 

[irvynejay]

ok one more thing h900 v2 use Mje340 for bias and h900 use BD241c witch is correct of bias transistor to use? mje or BD241c?

 

[apexaudio]

ok one more thing h900 v2 use Mje340 for bias and h900 use BD241c witch is correct of bias transistor to use? mje or BD241c?

Both versions use MJE340, BD241C is drawing mistake.

 

[irvynejay]

h900

good to go

Ready for wiring

 

[aman khalsa]

nice work sir ....good luck

 

[apexaudio]

good to go

Ready for wiring

Nice PSU 😉

 

[vijay_meyou]

Hi Irvynejay,

Nice work! are you palnning to use LDR and LED insteed of NSL32? hope you have not connected LED..

 

[irvynejay]

ldr

Hi Irvynejay,

Nice work! are you palnning to use LDR and LED insteed of NSL32? hope you have not connected LED..

i use ldr and led,LED not yet connected,, i cant find nsl32 here

 

[aman khalsa]

making NSL32...

hello sir

i m trying to make NSL32 .i use simple LDR nd LED..is this ok???😕

thank u

 

[asia]

apex,
is this class h
http://www.crestaudio.com/media/schematics/8002_schematic_set1.pdf

 

[irvynejay]

@Mile Hello

Im having problem with my PSU i got unbalance -/+dc on medium voltage with out load

120vdc 60vdc 0 63vdc 120vdc is it safe to load the 2 H900

 

[irvynejay]

apex,
is this class h
http://www.crestaudio.com/media/schematics/8002_schematic_set1.pdf

Class H yan bro dahil dual voltage ang gamit hi at low voltage rails

Yes bro its class h bro it uses dual voltage rails is high and low

 

[aman khalsa]

marry Christmas to all DIY,s....

 

[Root2]

hello sir

i m trying to make NSL32 .i use simple LDR nd LED..is this ok???😕

thank u

Hi,

Check the light spectrum of the LDR I found green LED to be better also I discover whilst I was with Magnum Green LED produce less noise.

Colin Wonfor

 

[TonyTecson]

@Mile Hello

Im having problem with my PSU i got unbalance -/+dc on medium voltage with out load

120vdc 60vdc 0 63vdc 120vdc is it safe to load the 2 H900

as long as your output offset voltage remains low or nearly 0, i seen no problem......

the tapping on your power traffo was innacurately done, that is why i do all my traffos with bifilliar wound secondaries, so that turns count is kept accurate....

 

[irvynejay]

Ok ty Boss Tony,,Actually my trapo has also bifillar winding and i dont know why its not accurate ...

 

[irvynejay]

H900 testing

@Mile GOOD DAY
1 channel now working, voltage rails for testing 75/44/0/44/75 -/+
feed 50hz and 100 hz in full volume without load clip indacator is glow permanent, i just use analog multimeter to test ac voltage on output Pls see some picture....

I load some Speaker and Superb Sound<><

 

[irvynejay]

2Channel H900 fired up

Happy holidays to all

2Channel of H900 is now fired up and Great HiFi sounds
next action install Apex Protect circuit and the right Trapo to check Heat and power

TY MILE!!