900W H-class PA Amp with Limiter

[engel dela pena]

hello andrew,
too much busy for class d?
please share 3EF class h

 

[engel dela pena]

andrew,
why not post your working 3EF h900,
let your work inspire all diy folk,
and let us know if any procedure is needed,...if any new,...other than 4 pair h900 procedure,
as we follow ,some changes
the bias resistor R23 is 15k for b500/h900
3EF is 7k5
using bd681
200ma

 

[engel dela pena]

It's correct, set 5-10mV on the emmiter resistors.

this info,and the attachment

 

[engel dela pena]

andrew,
why not post your working 3EF h900,
let your work inspire all diy folk,
and let us know if any procedure is needed,...if any new,...other than 4 pair h900 procedure,
as we follow ,some changes
the bias resistor R23 is 15k for b500/h900
3EF is 7k5
using bd681
200ma

sorry the correct was 20ma per output

 

[engel dela pena]

i'm beginning to wonder why still no 3EF pcb have been shared,
after all the info and details have already been shared,
wish i have the tools for designing pcb,from software to materialisation

 

[engel dela pena]

hello all diy people
for us all,all interested to 3EF h900
hope somebody help this time
this will surely work,sir irvynjay lay out of ir step + this output pair and + sameer driver pcb
just please....please somebody help this time

 

[engel dela pena]

sameer and andrew,
have abandoned us

 

[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

hello andrew,
sameer not yet coming over?

 

[DILIP KUMAR]

Hello everybody,
Here is photo of my new project along with supply transformer newly made.

 

[andrewlebon]

HELLO

Hi Engel dela pena
greetings here it is send e mail i send you one of chestaps special amp TEF
warm regards
andrew lebon

 

[andrewlebon]

HELLO

HOPE THIS HELPS YOU
warm regards
andrew lebon
i send you something better

 

[Riff]

TEF?

Hi Engel dela pena
greetings here it is send e mail i send you one of chestaps special amp TEF
warm regards
andrew lebon

is this 3ef???
where is pair of predrive 340/350?
i thing this is H900 7pair output with pair of 4793/1837 as predive instead 340/350 and pair of 5200/1943 as driver instead 15032/15033.
or i"m wrong???
sory my bad english...
Regards.

 

[kimberlator]

Is that house fly sitting on the transistor also part of your project?😀

lol 😀

 

[engel dela pena]

andrew,
thanks
but is it 500 or 10k
the trimpot

 

[andrewlebon]

Hi Engel dela pena
greetings its 500 ohms preset
warm regards
andrew lebon

 

[engel dela pena]

nazirdi & andrew,
this one is cleared before hope you clarified once again,
thanks.....
500 vs. 10k

 

[wattaniya]

i put 10k pot and works perfect.

 

[engel dela pena]

nice nazirdigi thanks

 

[totski]

hello diyer's! can anyone help me with xlr input complete detail's??? b500 first power up need info. thank's

 

[andrewlebon]

http://www.diyaudio.com/forums/solid-state/25317-has-any-one-built-1kw-amp.html
MAYBE this looks a better one to build
warm regards
andrew lebon