900W H-class PA Amp with Limiter

[jose1985]

bav21 diodes I did not find them replace by 1n4148

 

[jose1985]

the diodes bav21 I did not find them change them for diodos1n4148 and I want to ask a question
the diodes zf and z and all are zener of 15v or I am wrong

 

[sownel]

Greetings mr,apex sir
i try to make your hx 900 problem on step driver positive side +55vdc and negative side-65vdc increased on full volume. my rail 109-59-0-59-109vdc

 

[pallab]

I would like to build APEX H900 Ver.2

Thank you Mr. Mile for sharing this class H amp...

Regards,
Wiljj78

can you please share PCB side in PDF ??💐

 

[jose1985]

friends good morning I want to thank God and all for their contributions in this post of the apex h900 because thanks to all the friends that shared it was possible to join me with great satisfaction this amplifier and I was not any mishap at the moment of putting it to work

 

[jose1985]

these materials remplaze bav21-1n4148 / and zener zy-zf for zener of 15volts

 

[masood251]

Dear sir
Can i use as i have 90..45..0..45..90 volts 10 ampre transformer for h900
Thanks

 

[masood251]

Hi Apex, what is the minimum current to drive your step drive?

Thanks,
Dacs

Dear sir
Where is this step drive mirrored pdf .i want plz send me my email alvi.masood251@gmail.com
Thank you

 

[iiee3602]

Sir Miles can i use XLR input of apex ba1200 in apex h900?

 

[masood251]

very nice clean work. .mje 340 ,350 also need heatsink.

Hello rohin
I want 2pieces ir2117 plz send me
My email is alvi.masood251@gmail.com

 

[anand555]

H900

Hi friends I have build a h900 but facing some problem if I have on the power supply 100 ohms resistance start the burning near mje340

 

[wiljj78]

can you please share PCB side in PDF ??💐

I thinks Its posted.. just try to read back.

Otherwise let me know if you can't find it i will repost.

Regards,

 

[moore4889]

Hi friends I have build a h900 but facing some problem if I have on the power supply 100 ohms resistance start the burning near mje340

hi sir please take note that when going to supply power on the amp see to it that all transistors output and driver are on heatsink...mje340(bias ) adjust according to drivers and outputs transistor temperature,,,dont forget to put series bulb in main input supply to minimize damage on parts when there still problem,,,Goodluck...

 

[anand555]

Thanks Sir, moore4889

 

[Kagz]

Thank you very many sir Apex. H900 is no joke. I just woke up a Peavey PV1500 power amp that uses +-90Vdc from a 65-0-65Vac toroid and 8 pair C5200nA1943 trannies both channel so 4C and 4A per channel. Was burnt beyond repair but i have a working channel H900 n modified the toroid for H Class. I am impressed by performance. Thanks Apex. Here are some pictures.

 

[Kagz]

That was my very first H class. There has not been any IR2117 til' recently. H900 is indeed a performer. A million thanx to sir Apex. Long live sir Apex.

 

[moore4889]

nice build sir kagz.....i enjoy making amp like this apex h900...

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An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[Kagz]

Thanx moore4889. I see you use two irf540s for switches. I just used a single irfz48 without any problems. But my 16A MUR1620 diodes are usually hot at high volumes. Is this normal?

 

[stewin]

Thanx moore4889. I see you use two irf540s for switches. I just used a single irfz48 without any problems. But my 16A MUR1620 diodes are usually hot at high volumes. Is this normal?

what is your load impedance??

 

[moore4889]

Thanx moore4889. I see you use two irf540s for switches. I just used a single irfz48 without any problems. But my 16A MUR1620 diodes are usually hot at high volumes. Is this normal?

it is normal specially when driving low impedance speaker you better put some heatsink on those mur....

Regards.