900W H-class PA Amp with Limiter - Page 11 - diyAudio
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Old 19th March 2010, 11:04 AM   #101
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Quote:
Originally Posted by apexaudio View Post
Comutation diode SFA1603 in negative side have wrong direction, be more careful.
Regards
To Andrew Lebon
Several eletrolitic cond. also wrong direction...
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Old 19th March 2010, 02:18 PM   #102
wg_ski is offline wg_ski  United States
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hi apexaudio
greetings work in progress
Andrew,

How are you planning to drill and mount the heat sink? One thing I will mention is that its a whole lot easier to drill the heat sink *before* soldering output tansistors (and commutators) to the board! A copy of the layout can be used as a drill template. Mount the outputs, then put the leads through the board one by one starting from one end. Then solder. This forces everything to align and there is less chance of breaking something. It's frustrating to have a competed, stuffed board and try to drill from that - and then the holes still don't line up.
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Old 19th March 2010, 02:44 PM   #103
ontoaba is offline ontoaba  Indonesia
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There is no slew limiter, but its OK for diy. Is this your first class-H?

Nice project.
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Old 19th March 2010, 08:31 PM   #104
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There is no slew limiter, but its OK for diy. Is this your first class-H?

Nice project.
There is detect for VI Cut-out, post "mute" signal to protect board. This is simple schematic praktic for DIY. I made all kind H-class step circuits (QSC, Crest, Mackie...) this one not in use last 2 years.
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Old 20th March 2010, 02:17 AM   #105
qsa is offline qsa  Germany
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Hi apexaudio

can you post latest Class H Step driver schematics that can be use with most class A/B amps ?
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Old 20th March 2010, 04:54 AM   #106
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hi apexaudio
greetings thanks for pointing out my mistakes have changed polarity
of condensers inserted wrongly checking pcb for mistakes
1 will send you high resolution pictures for inspection before powering up
2 schematic of power supply torroidial connections to filter condensers and bridges
would make life easier
for checking module any specific method used like series bulb while powering on
3 any voltage measurement chart would be very useful
thank you for pointing my mistakes and for your cooperation
thanking you
andrew lebon
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Old 20th March 2010, 12:22 PM   #107
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Default Ab > h

Quote:
Originally Posted by qsa View Post
Hi apexaudio

can you post latest Class H Step driver schematics that can be use with most class A/B amps ?
Class H Step Driver based on C-audio and Crown schematics.
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File Type: jpg APEX STEP DRIVER.jpg (252.7 KB, 3815 views)
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Old 21st March 2010, 11:15 AM   #108
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Quote:
Originally Posted by andrewlebon View Post
hi apexaudio
greetings thanks for pointing out my mistakes have changed polarity
of condensers inserted wrongly checking pcb for mistakes
1 will send you high resolution pictures for inspection before powering up
2 schematic of power supply torroidial connections to filter condensers and bridges
would make life easier
for checking module any specific method used like series bulb while powering on
3 any voltage measurement chart would be very useful
thank you for pointing my mistakes and for your cooperation
thanking you
andrew lebon
I will post PSU, soft-start and protect schematics with specific method for powering on with series 150R 10W resistor.
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Old 21st March 2010, 12:20 PM   #109
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Default H900 Component Layout

This can help.
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Old 22nd March 2010, 03:22 AM   #110
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Hi Andrew,

I am also interested in making this amp,but I am unable to get IR2117 in my town.Could you please help me out
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