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Old 13th May 2013, 01:36 PM   #21
wiljj78 is offline wiljj78  Philippines
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Default Exactly......

Quote:
Originally Posted by apexaudio View Post
Many diyers love old school amps with classic design without cascodes or class H operation, just simple current mirror VAS and EF output stage
A simple current mirror VAS and EF output stage will be exciting and diy freinds will love and have fun building this new APEX amp design (maybe with 4 pair for initial build using lower rail voltage then can be upgrade with few versions later into a max pairs accordingly) that will fit everyone needs.

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Old 13th May 2013, 05:45 PM   #22
astx is offline astx  Austria
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Default SOA problem

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Originally Posted by AndrewT View Post
What about SOAR of a 9pair 1943/5200 stage when operating from a 110Vdc supply?
You are right. There is a very clear SOA problem. See attached picture.
Simulations show 400W to 1000W resistive load @4R.
SOA worsens with real reactive load.
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File Type: png apexaudio_1000w_soa.png (163.2 KB, 2195 views)
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Old 13th May 2013, 06:34 PM   #23
AndrewT is offline AndrewT  Scotland
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I use my usual Pmax guide.
Pmax ~ total BJT output stage wattage divide by 5 or 6.
Since the 1943/5200 have terrible high voltage SOA, I would use divide by 6 if I can keep them cool enough.
9pr of 150W devices = 2700W.
Pmax ~ 450W if kept adequately cooled.

That's why I raised the comment, particularly since Apex is suggesting it for PA duty.
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regards Andrew T.
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Old 13th May 2013, 06:50 PM   #24
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Originally Posted by andrewlebon View Post
Hi Apexaudio
greetings is it possible for you to post limiter and protection schematic
warm regards
andrew lebon
BA1000 Input include: Balanced Input, 30Hz Low Cut Filter, Limiter and Volume Control,
Regards
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File Type: jpg APEX BA1000 Input.jpg (94.3 KB, 2123 views)
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Old 13th May 2013, 07:19 PM   #25
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Quote:
Originally Posted by astx View Post
You are right. There is a very clear SOA problem. See attached picture.
Simulations show 400W to 1000W resistive load @4R.
SOA worsens with real reactive load.
Thanks for this warning.
Regards
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Old 13th May 2013, 08:02 PM   #26
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by apexaudio View Post
BA1000 Input include: Balanced Input, 30Hz Low Cut Filter, Limiter and Volume Control,
Regards
Loved your limiter.
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Old 14th May 2013, 12:11 AM   #27
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Quote:
Originally Posted by AndrewT View Post
I use my usual Pmax guide.
Pmax ~ total BJT output stage wattage divide by 5 or 6.
Since the 1943/5200 have terrible high voltage SOA, I would use divide by 6 if I can keep them cool enough.
9pr of 150W devices = 2700W.
Pmax ~ 450W if kept adequately cooled.

That's why I raised the comment, particularly since Apex is suggesting it for PA duty.
MJL21195/96 or MJL4281/4302 will be ok and 1N5408 for back EMF.
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Old 14th May 2013, 01:04 AM   #28
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Quote:
Originally Posted by andrewlebon View Post
Hi Apexaudio
greetings is it possible for you to post limiter and protection schematic
warm regards
andrew lebon
You can use this simple DC protection with 40A relay (12V for car)
Attached Images
File Type: jpg APEX BA1000 Protect.jpg (87.1 KB, 1972 views)
File Type: jpg relay.jpg (130.1 KB, 1858 views)

Last edited by apexaudio; 14th May 2013 at 01:27 AM.
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Old 14th May 2013, 01:46 AM   #29
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What will be the changes in the amp drive and output if I make this 1000w at 8 Ohms?
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Old 14th May 2013, 01:50 AM   #30
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If this AB is for PA then THD will be more higher.Can you give us a distortion plot?
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