900W H-class PA Amp with Limiter

[apexaudio]

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.

It is working this way.

 

[desislavov]

Hi apexaudio ,
tnx for the class H shematic and PCB . I`m start to build it !
Regards !

 

[wattaniya]

hi apex sir,
can i use this 30a 24vdc relay for h900 protect pcb.?
i know its not fitting to the protect pcb.

 

[apexaudio]

hi apex sir,
can i use this 30a 24vdc relay for h900 protect pcb.?
i know its not fitting to the protect pcb.

Yes there isn't shunt resistor in series with relay, any 24vdc relay can be use.

 

[wattaniya]

thanks sir

 

[wattaniya]

hi apex sir,
can u share ur h900 v2 pcb and protect pcb in pdf .

 

[engel dela pena]

vertex
http://www.diyaudio.com/forums/solid-state/199879-vertex-amp-apexaudio.html

 

[mkubawat]

Dear Ravpreet

IR2117 Rs200 each
minimum order quantity - 10 nos.
courier charges Rs 100 extra

you can use UF4004 instead of BAV21
if you want receive private message, enable- receive private messages system

 

[mkubawat]

Dear Apex
I have lot of 12v 30amp relays, To use them in protect PCB, what changes should be apply.

 

[apexaudio]

Dear Apex
I have lot of 12v 30amp relays, To use them in protect PCB, what changes should be apply.

I suggest this protect with NE555 for 12V relays.

 

[mkubawat]

I suggest this protect with NE555 for 12V relays.

Thanks for circuit
please post PCB Layout, if you have

 

[mkubawat]

finally H900 ready for test with temporary wiring...........
here is some pix

 

[wattaniya]

hi apex sir,
pls can u share the protection pcb top and bottom in pdf format.
so i can edit to 30a relay.
thanks.

 

[aman khalsa]

sir ur transformer is very smal.....!!!!!

 

[wattaniya]

hi apex sir,
is this connections are correct for 30a relay sir?

 

[ariyanto]

hi chestap
greetings work in progress tell you result today
warm regards
andrew lebon

Is the layout can be weeks to appear, thanks

 

[AndrewT]

Nazir,
measure the coil resistance. Check that it pulls in with either polarity of supply. Some relays only pull in with one polarity.

Measure the switching terminals for zero volts. Normally Closed pair will read zero ohms. Normally Open pair will read open circuit.
Apply power to relay. The NO will now read zero ohms and the NC will read open circuit.
The common terminal is the one of each pair that is common to those zero ohm readings.

 

[mkubawat]

sir ur transformer is very smal.....!!!!!

this is 600va transformer. after testing,two transformers will be used for 2 zone.

 

[mkubawat]

Dear Apex
Please help about H900
start clipping when high rail triggers, still same condition without load.
I use LED as a clip indicator instead NSL32
transformer 80-45-0-45-80AC
please tell me reasons & solution.

 

[desislavov]

without load you have high voltage on output .
If offset is normal , install some speaker and test or take oscilloscope and see what happen when led is light ( whit 4 or 8 ohm resistor )
Regards !