900W H-class PA Amp with Limiter

[engel dela pena]

a working 3EF h900 is better
andrew where is your pm to me

 

[wintermute]

OT posts removed.

 

[wiljj78]

28VAC/300VA

I wonder if these 6X28VAC / 300VA each can handle Stereo H900???

 

[Tekko]

Stereo 900WRMS calls for a PSU thats atleast 3kW continous power capable, 2x900W = 1800W, add to that a rough estimation of 50% efficiency and you end up with 3.6kW of PSU.

This assumes 2x900WRMS with both channels driven.

 

[44250]

You need eight of them not because of power needed but because it is double simetric supply,four rails. Two channel doubles it. Than it would be close enough even with power of supply.

 

[wiljj78]

Hi Tekko/44250,

I really appreciate your swift response, thank you sooo much for the info.

Wiljj78

 

[gista22]

thanks for this site..

 

[totski]

diy'ers in philippine,,,anyone in need of ir2117 let me know my no.is 09194022245, cerdenia.luisito@yahoo.com.

 

[sandeep kayarkar]

My H900, very hard bass, clean sound, i think i need more powerfull speaker, Thanks To sir Mile and Aman khalsa.

 

[apexaudio]

My H900, very hard bass, clean sound, i think i need more powerfull speaker, Thanks To sir Mile and Aman khalsa.

Nice Amp
Regards

 

[Tube Pro]

Hi Mile,

if 1500VA transformer is for one channel H900, for 2-channel amp, do you prefer 2 transformers (1500VA) or 1 transformer with 3000VA rating?

Thanks

 

[apexaudio]

Hi Mile,

if 1500VA transformer is for one channel H900, for 2-channel amp, do you prefer 2 transformers (1500VA) or 1 transformer with 3000VA rating?

Thanks

I prefer 2 transformers (1500VA) for 2-channel, but I use one 1800VA
Regards

 

[Tube Pro]

H900 toroids

I prefer 2 transformers (1500VA) for 2-channel, but I use one 1800VA
Regards

you use 1800VA for 2 channels?

 

[apexaudio]

you use 1800VA for 2 channels?

Yes, with audio signal amp need high voltage and high current only in peaks.

 

[Riff]

3ef VAS

3ef VAS without limiter
i hope sir mile can correct this.
regards

 

[apexaudio]

3ef VAS without limiter
i hope sir mile can correct this.
regards

Nice work, but I have no time for correct
Regards

 

[Riff]

Nice work, but I have no time for correct
Regards

just thnks for replay sir...

 

[yosha]

Sir Mile i have 2 questions for u:
1: do 4 pairs at the output stage are enough to drive 4ohm load at full power keeping in mind that they are powered with 120vdc..no need for extras?
2: the swithching between 50v to 120v is fast enough with no distortion between switching?
Thank u...

 

[engel dela pena]

I prefer 2 transformers (1500VA) for 2-channel, but I use one 1800VA
Regards

sir miles,
what are the effects of big transformer?
is this the reason why output get burned?
how about if transformer is small?
is this the reason why transformer get burned?
please guide about this transformer & output balancing.thanks
regards.

 

[engel dela pena]

3ef VAS without limiter
i hope sir mile can correct this.
regards

nice work riff
i hope you were the answer to all waiting for 3EF pcb for share