900W H-class PA Amp with Limiter - Page 3

audiomachines · 6th March 2010, 02:04 PM

thanks for sharing

andrewlebon · 6th March 2010, 02:20 PM

hi apex
greetings
1 any substitute for diode BAV 21
2 any substitute for diode SAF 1603 very hard to find
can you show inputstage schematic and power supply schematic
waiting to make your amplifier thanking you

apexaudio · 6th March 2010, 03:51 PM

Quote:

Originally Posted by andrewlebon

hi apex
greetings
1 any substitute for diode bav 21
2 any substitute for diode saf 1603 very hard to find
can you show inputstage schematic and power supply schematic
waiting to make your amplifier thanking you

bav21 > byd73c, byd33d
sfa1603 > byv79/200, byw29/200

apexaudio · 7th March 2010, 09:14 AM

Landscape view on H900

powerflux · 7th March 2010, 02:02 PM

thank you, i'd most interrested in the 'vas' stage.

the railswitching is nice too

apexaudio · 7th March 2010, 09:04 PM

I work on my website EUnet Hosting
Most information about my work will be there. I will have more time for reply when site was finished.
Regards Mile

andrewlebon · 8th March 2010, 12:09 AM

hi apexaudio
greetings can you share power supply schematic
1 transformer used with filter capcitors
2 current capcity amperes for full output 900 watts
collecting parts for amplifier
thanking you
andrew lebon

apexaudio · 05:34 PM

Quote:

Originally Posted by andrewlebon

hi apexaudio
greetings can you share power supply schematic
1 transformer used with filter capcitors
2 current capcity amperes for full output 900 watts
collecting parts for amplifier
thanking you
andrew lebon

I will post schematic for PSU and protect soon.
Full power of this amplifier is not 900W. Power with THD 0,5% is 1200W on 4R load, and 1800W on 2R load. Output transistor must be MJL4281A/MJL4302A for maximum power. For step mosfet use IRF2807. MJL21193/MJL21194 can be used for full power on 4R load.
Transformer minimum 1500VA for one channel 4X40V AC + 2X20V for protection circuit. 2X35A bridge and 8X10000uF/63V for PSU... are you still interesting to build this amplifier?

event horizon · 8th March 2010, 06:07 PM

Hi Mile

Thanks for sharing the class H circuit, having looked at it & it's simplicity i think i'll be incorporating it into a few amps that i'll be building in the future

You have just saved me the hassle of building a switchmode PSU even though i didn't realise it at the time when i saw your circuit. Instead i can use transformers i already have but build a high power high frequency charge pump circuit to power the high voltage rails

Cheers for making me think, & for saving me time, hassle & money

Bests, Mark

qsa · 8th March 2010, 06:26 PM

Class H DIY good idea,...

check RMX 5050 schematic for DIY ideas...

I want spend my time to add Class H in Quasi NMOS Amp too and share experience with another DIY people,...actually i dont have much time for DIY

8th March 2010, 06:07 PM	#29
event horizon diyAudio Member Join Date: Feb 2008 Location: East Midlands, England	Hi Mile Thanks for sharing the class H circuit, having looked at it & it's simplicity i think i'll be incorporating it into a few amps that i'll be building in the future You have just saved me the hassle of building a switchmode PSU even though i didn't realise it at the time when i saw your circuit. Instead i can use transformers i already have but build a high power high frequency charge pump circuit to power the high voltage rails Cheers for making me think, & for saving me time, hassle & money Bests, Mark __________________ "Never let your morals prevent you from doing what is right!" Salvor Hardin

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6th March 2010, 02:04 PM	#21
audiomachines diyAudio Member Join Date: Dec 2005 Location: silang, cavite	thanks for sharing

6th March 2010, 02:20 PM	#22
andrewlebon diyAudio Member Join Date: Feb 2008	hi apex greetings 1 any substitute for diode BAV 21 2 any substitute for diode SAF 1603 very hard to find can you show inputstage schematic and power supply schematic waiting to make your amplifier thanking you

7th March 2010, 02:02 PM	#25
powerflux diyAudio Member Join Date: Apr 2008	thank you, i'd most interrested in the 'vas' stage. the railswitching is nice too

7th March 2010, 09:04 PM	#26
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	I work on my website EUnet Hosting Most information about my work will be there. I will have more time for reply when site was finished. Regards Mile

8th March 2010, 12:09 AM	#27
andrewlebon diyAudio Member Join Date: Feb 2008	hi apexaudio greetings can you share power supply schematic 1 transformer used with filter capcitors 2 current capcity amperes for full output 900 watts collecting parts for amplifier thanking you andrew lebon

8th March 2010, 06:26 PM	#30
qsa diyAudio Member Join Date: May 2007	Class H DIY good idea,... check RMX 5050 schematic for DIY ideas... I want spend my time to add Class H in Quasi NMOS Amp too and share experience with another DIY people,...actually i dont have much time for DIY