900W H-class PA Amp with Limiter

[ryanda]

For 1500W into 2 ohms U need 2000W transformer, use two PSU for stereo.
Regards

Hi apex...where is the better..2 h900 in bridge mode or h900 tef?🙂

 

[vorezky04]

Where i can schematic B500 TEF and H900 TEF?

 

[sandeep kayarkar]

use mjl21193,mjl21194 for the outputs and drivers & you can use two types of relays for the speaker protection relay,(12V)..good sound...enjoy it..

sir Chestap.

i need help,
i have done all the work on your amp, just waiting for njm ic,can you pls tell me any substitude of njm4580,m5218,m5218 AL? its hard to find.


thanks

 

[andrewlebon]

hi Sandeep
greetings use NJM4558
WARM REGARDS
andrew lebon

 

[ravpreet420]

njm 4558L series

 

[SERGIODS]

Do anyone want to DIY something like that?

😱😱😱 magnific 😱😱😱

 

[daveinsingapore]

hey guys if any of you want stock of NSL 32's I have 10 in stock...got them from Crest in Melbourne Australia...paid with paypal and in the post already...

 

[totski]

protect

hello mile, im new in this amp forum about the protect for H900 can i use it in b500?

 

[anchewrycortpriez]

hi Sir, i want to build H900 but im not good in making PCB, can you guys help, thank you

 

[anchewrycortpriez]

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?

hi i am Andrew Cortez from Philippines i'm going to build your amplifier design, i'm exited to hear and feel its performance as a power full home audio

 

[totski]

sir gud day, where did you buy parts for your h900 in riyadh? my bro is in riyadh,iask them to buy for me hard to find parts here in Pinas.

 

[marc underson]

hello dear sir apex
sameerx1 to do it myself with your schema, but i have thought proper to print pcb materials, the name of my hand there are the non-transistor material as possible, placing the full scheme name and email it thicker Take Care Thank you. email
protechelektronik@hotmail.com

 

[marc underson]

hello dear sir apex
sameerx1 to do it myself with your schema, but i have thought proper to print pcb materials, the name of my hand there are the non-transistor material as possible, placing the full scheme name and email it thicker Take Care Thank you. email
protechelektronik@hotmail.com

 

[mj777]

My APEX H900

my Apex H900 on a DIY case, nice sound crystal clear.

 

[apexaudio]

my Apex H900 on a DIY case, nice sound crystal clear.

Nice work, what protect you use

 

[mj777]

Sir Mile, I use the stereo dc protect from quasi amplifier and a two speed fan with NTC temperature sensor the pcb was made by alexmm, thanks Sir Mile for a really good sounding amplifier.

regards,
mj777

 

[wattaniya]

h900 v1,
mur1520 diode i used instead sfa

 

[sandeep kayarkar]

heat problem

Nice work, what protect you use

Sir mile, H900 amp having of heating r26 6.8k 2watt.
pls help me out.

THANKS

 

[apexaudio]

h900 v1,
mur1520 diode i used instead sfa

Nice work

 

[apexaudio]

Sir mile, H900 amp having of heating r26 6.8k 2watt.
pls help me out.

THANKS

That's OK, 6k8/2W must be hot.