900W H-class PA Amp with Limiter

[irvynejay]

NMOS is correct ,,Most btj stepper will have unbalance -/+ when it triggers sometimes - or + side will get stuck ,,its better to make Class G rather than class H with BTJ's

 

[congo]

APEX H900 Schematic and PCB

Dear Apex,
what is the size of the prottection pcb ?

Best regards.

 

[wattaniya]

hi andrewlebon,
chestap said there are two type of relays can use.
can u give the relay information of both relays and how many pins,.
other question is can i use black relay for h900 protect board and if u can give pin details to board.

thanks

 

[AndrewT]

Naz,
note both example relays are rated to 30Vdc.

A high power amplifier can easily exceed 30Vdc in fault condition.

 

[andrewlebon]

relay

hi nazirdigi
greetings well for h900 protect pcb the first relay the transparent one
but the relay pins should match pcb no use buying a relay and later find out
its pin do not coincide with pcb holes take the pcb and see if relay pins fit pcb
1 please follow SIR ANDREW T advice VOLTAGE AND CURRENT CAPACITY OF RELAY
warm regards
andrew lebon

 

[wattaniya]

hi nazirdigi
greetings well for h900 protect pcb the first relay the transparent one
but the relay pins should match pcb no use buying a relay and later find out
its pin do not coincide with pcb holes take the pcb and see if relay pins fit pcb
1 please follow SIR ANDREW T advice VOLTAGE AND CURRENT CAPACITY OF RELAY
warm regards
andrew lebon

thanks for reply andrew t and andrewlebon,
i know h900 protect board not fit to black relay, the 16a transparent relay is very expensive, black one is cheap, can i wire h900 board to black relay?
can u show me how to wiring of h900 board to black relay pins.
if its ok black relay for h900 i can edit h900 protection board .

 

[wattaniya]

hi apex sir.
after long time,
pls can u share the h900 v2 pcb layout in pdf format.

thanks.

 

[irvynejay]

😎

 

[wattaniya]

😎

hi irvynejay,
this is not the high resolution pdf file.
only apex sir have high resolution pdf.

 

[irvynejay]

what ever..

 

[andrewlebon]

H900 upgrade

H900 can be upgrade with 15mA VAS current for 3 step class H and add more outputs for more power. I will share upgrades when amp was tested.

Hi apexaudio
greetings nice to see you back on diy forums is it possible to share
h900 with 15 ma vas current for 3 steps as many diyers have built this amp so we can upgrade it
warm regards
andrew lebon

 

[ravpreet420]

Very good effort andrewlobon

 

[mkubawat]

H900 can be upgrade with 15mA VAS current for 3 step class H and add more outputs for more power. I will share upgrades when amp was tested.

Hi apexaudio
greetings nice to see you back on diy forums is it possible to share
h900 with 15 ma vas current for 3 steps as many diyers have built this amp so we can upgrade it
warm regards
andrew lebon

it's a good news

 

[wattaniya]

hi apex sir.
in my h900 potect board when i power off after 2 seconds the relay is disconecting .
why is that?
i m using 16a relay 24v dc.
thanks

 

[AndrewT]

You have included a delay on loss of power.
I wonder if the same or similar delay is incorporated when fault current flows?

 

[black]

andrewlebon weiting schematic 3 step regards

 

[andrewlebon]

schematic 3 step

Hi Black
greetings schematic of 3 step PAGE61 h900 thread

warm regards
andrew lebon more H CLASS amps to build

 

[mahesh776]

mje15033/32 heating

sir i am biginer i made b500 fist time using + -40v,using 5200/1943 for testing but mje15033/32 heating ,as i replaced r23(330 ohm)by1.5k problem solved. can you please explain what could be adversed effect of this in b500 and b900h. please give your kind suggestion.my email-jhariya777mahesh@gmail.com
-regards

 

[black]

sir andrewlebon is weiting more picture best regards

 

[wattaniya]

hi apex sir,
my h900 protection board is not working properly.
my protection light is not lighting when i power on,
i saw some power amps when the switch is on the protection light is lighting after one second the light is off.
is it working this way or no lighting on.