900W H-class PA Amp with Limiter

[wattaniya]

Nice work

thanks sir for the comment.

 

[sandeep kayarkar]

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

Thanks for the quick reply sir

 

[sandeep kayarkar]

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

Sir mile, My H900 takes too much time to get normal. i mean when i power up amp and protect it makes loud hum for a second and then calm.
is there any problem?

 

[sandeep kayarkar]

thanks sir for the comment.

i am using U1560, and its fine

 

[DANIEL SPASOVSKI]

Hi Apex 🙂 Greetings from Macedonia 🙂 Your designs are cool 🙂

I want to ask how much power can i get from H900 if i use toroidal transformer with specifications like this - 2x55V AC ; 1000VA

Please respond me fast ... Greetings 🙂

 

[apexaudio]

Hi Apex 🙂 Greetings from Macedonia 🙂 Your designs are cool 🙂

I want to ask how much power can i get from H900 if i use toroidal transformer with specifications like this - 2x55V AC ; 1000VA

Please respond me fast ... Greetings 🙂

H900 work in class H and need 4x40V AC, use your transformer for B500.

 

[Riff]

step driver

H900 work in class H and need 4x40V AC, use your transformer for B500.

is this correct sir?
psu is 120-60-0-60-120 dc
i add h200 step driver for h900,
any change or replacement for this schema?

 

[apexaudio]

View attachment 290974
is this correct sir?
psu is 120-60-0-60-120 dc
i add h200 step driver for h900,
any change or replacement for this schema?

Step driver from H200 can be use for H900 but with 4 pairs of IRFP140/IRFP9140.

 

[Riff]

Step driver

Step driver from H200 can be use for H900 but with 4 pairs of IRFP140/IRFP9140.

can i add 2pair of IRFP250?

 

[apexaudio]

can i add 2pair of IRFP250?

Use 4 pairs IRFP140/IRFP9140 in step driver for 4 pairs of outputs 2SA1943/2SC5200.

 

[andrewlebon]

HELLO

Hi Apexaudio
greetings just want to ask if H900 can be used with step driver
triggered from speaker output as most chinese amps use that which is a better option IR2117 step or step driver triggered from speaker output as
IR2117 is hard to get
warm regards
andrew lebon

 

[daveinsingapore]

alternative H900 without IR2117

Hi Apexaudio
greetings just want to ask if H900 can be used with step driver
triggered from speaker output as most chinese amps use that which is a better option IR2117 step or step driver triggered from speaker output as
IR2117 is hard to get
warm regards
andrew lebon

Hey Andrew there is another option for the H900 with step driver that does not use the IR2117...there is a transister step driver look at posting 1918 by Irvyne...he collected all the info on this one and posted it as one posting....

 

[mkubawat]

My H900 with ir2117 running well from last 6 month
Thanks apex

 

[Endik]

Use 4 pairs IRFP140/IRFP9140 in step driver for 4 pairs of outputs 2SA1943/2SC5200.

Can i use IRF2807 for this sch

 

[sandeep kayarkar]

H900

 

[Riff]

Can i use IRF2807 for this sch

ga bs kang...,you must add MOS N&P channel in this step driver...

 

[engel dela pena]

can you share tripple ef output pcb,7 pair maybe
so far nobody share

Hi Engel dela pena
greetings can you please tell which post is the TEF stage
i will try to design pcb for you and forum the SOE PCB
warm regards
andrew lebon

hello,how is the 3EF any progress

 

[engel dela pena]

final pcb will be like this engel dela pena
warm regard
sameerx1

sameerx1
how is it going,long time no hear

 

[andrewlebon]

Hi Engel dela pena
greetings sameer will be comming over i will tell him to post files on forum
warm regards
andrew lebon

 

[engel dela pena]

Hi Engel dela pena
greetings sameer will be comming over i will tell him to post files on forum
warm regards
andrew lebon

thanks,
we have jumped over many pages from 186 i guess,
hope he will post this time