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900W H-class PA Amp with Limiter
900W H-class PA Amp with Limiter
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Old 9th May 2010, 02:45 PM   #531
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by khalsa View Post
Hi apex i am using ssh70n10a mosfet it contans 70 ampere 100volt.

Blue wire in input ground. i connect direct to the PCB.
Output is clear no problem.
plz chk this out.
Regards
Khalsa
Remove blue wire, and connect wire from psu gnd to signal input cinch gnd.
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Old 12th May 2010, 12:30 AM   #532
andrewlebon is offline andrewlebon  India
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hi apexaudio
greetings amplifier rocking want to finish packing it
1 are 10 10000 uf condensers for i channel or both
2 any preamplifier with base treble for this amplifier
will mj 15024 mj15025 increase power and safety 4 pairs will sound quality
be same
3 can you please tell me torridal diameter and height dimensions powering
both channels
thanking you
andrew lebon
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Old 12th May 2010, 06:09 AM   #533
electra_ina is offline electra_ina  Indonesia
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For my project H900..I now still waiting IR2117...If H900 completed, I will share picture my project...
Regards
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Old 12th May 2010, 08:30 AM   #534
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by andrewlebon View Post
hi apexaudio
greetings amplifier rocking want to finish packing it
1 are 10 10000 uf condensers for i channel or both
2 any preamplifier with base treble for this amplifier
will mj 15024 mj15025 increase power and safety 4 pairs will sound quality
be same
3 can you please tell me torridal diameter and height dimensions powering
both channels
thanking you
andrew lebon
1 PSU PCB with 8x10000uF is for stereo
2 I suggest only power amplifier in case, and preamp, mix, x-over... in another case.
3 Torridal diameter 200mm height 80mm for stereo amp in 2U case.
Regards
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Old 12th May 2010, 02:46 PM   #535
apexaudio is offline apexaudio  Serbia
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[QUOTE=
will mj 15024 mj15025 increase power and safety 4 pairs will sound quality
be same
[/QUOTE]
Yes sound quality will be same (best sounding PA amp I ever heared)
Regards
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Old 13th May 2010, 10:59 PM   #536
qsa is offline qsa  Germany
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@apexaudio

how do you think about this simple linear Class H BJT Step driver circuit is this PA Amp ?

is it possibile to use this linear Class h Step Driver in quasicomplementary output stage too ?

without known problems compare to switching Class H Step Driver with IR2117 IC and Mosfets ?
Attached Files
File Type: pdf M10_Schematic.pdf (140.0 KB, 1407 views)

Last edited by qsa; 13th May 2010 at 11:02 PM.
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Old 13th May 2010, 11:32 PM   #537
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by qsa View Post
@apexaudio

how do you think about this simple linear Class H BJT Step driver circuit is this PA Amp ?

is it possibile to use this linear Class h Step Driver in quasicomplementary output stage too ?

without known problems compare to switching Class H Step Driver with IR2117 IC and Mosfets ?
Try to find schematics or service manuals of some commercial PA amplifier with quasicomlementary nmos output stage (AB or H class), if this amplifier exist you can see solutions for your amp.
Regards
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Old 14th May 2010, 12:52 AM   #538
qsa is offline qsa  Germany
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Quote:
Originally Posted by apexaudio View Post
Try to find schematics or service manuals of some commercial PA amplifier with quasicomlementary nmos output stage (AB or H class), if this amplifier exist you can see solutions for your amp.
Regards
yes this Amplifier exist, have working some years ago for this company and sold a lot of pcs. from this model to european PA clients,

but heavy analaog amplifier is since 3 years obsolet in market by european clients.... and my previous factory dont have since today SMPS, this model dont like continous maximum Subbass output power, output devices can failed.

I dont like BJTs in output stage against bad experience, often different BJT amps failed with continous high output power

with hundreds of Class D and 50 pcs. sample NMOS amps +/- 100 V Rail no known problems compare to BJTs amps

very popular is class D in market.....class H with SMPS is popular too,... but not so much like class D

to find PRO AUDIO quasicomlementary nmos output stage (AB or H class) is really impossibile often amplifiers use BJT because this devices much more cheaper to produce amplifier,

Last edited by qsa; 14th May 2010 at 01:08 AM.
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Old 14th May 2010, 09:05 AM   #539
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by qsa View Post
yes this Amplifier exist, have working some years ago for this company and sold a lot of pcs. from this model to european PA clients,

but heavy analaog amplifier is since 3 years obsolet in market by european clients.... and my previous factory dont have since today SMPS, this model dont like continous maximum Subbass output power, output devices can failed.

I dont like BJTs in output stage against bad experience, often different BJT amps failed with continous high output power

with hundreds of Class D and 50 pcs. sample NMOS amps +/- 100 V Rail no known problems compare to BJTs amps

very popular is class D in market.....class H with SMPS is popular too,... but not so much like class D

to find PRO AUDIO quasicomlementary nmos output stage (AB or H class) is really impossibile often amplifiers use BJT because this devices much more cheaper to produce amplifier,
Development amplifier from zero is difficult, I suggest to use reable solution from brands, I am not sure that the prise is a reason to not use that topology by brands.
Regards
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Old 14th May 2010, 11:53 AM   #540
Workhorse is offline Workhorse
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Quote:
Originally Posted by qsa View Post
to find PRO AUDIO quasicomlementary nmos output stage (AB or H class) is really impossibile often amplifiers use BJT because this devices much more cheaper to produce amplifier,
EAW and ECLER uses NVMOS in their amplifiers
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