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Old 21st August 2011, 10:17 AM   #431
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what is this the pro on the schematisc?

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Last edited by yhoasakura; 21st August 2011 at 10:25 AM.
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Old 21st August 2011, 12:09 PM   #432
HighTec is offline HighTec  Croatia
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Quote:
Originally Posted by yhoasakura View Post
what is this the pro on the schematisc?

Click the image to open in full size.
Well, Pro is short term of Protection. It's an over-current detector and in case of short circuit on the output, it sends the error signal to the protection board.

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Old 21st August 2011, 12:38 PM   #433
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thank you very much HighTec
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Old 23rd August 2011, 08:25 AM   #434
Bushulo is offline Bushulo  India
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My email id bushulo@gmail.com if someone could kindly send me the gerber files or pdf of HV350.2 PCB layout.

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Old 24th September 2011, 02:08 PM   #435
masood is offline masood  India
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dear bushulo,
do you have obtain gerber files or pdf of hv350.2 pcb.i live in lucknow by this locotion i came to know that you belong to goa .i recently make a tour for goa,staid at hotel goa international in panji at meer mar beach.by the way it is very pleasant city i am too impressed with this city.my English is poor plz not mention.thanking you.my e mail is alvi.masood251@gmail.com
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Old 24th September 2011, 06:03 PM   #436
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Hello Mile,
Could you explain working of circuit in post 383 so we can adapt it to other amplifiers? How is the overload/short circuit detected? What current?

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Victor
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Old 29th September 2011, 01:41 PM   #437
xsmid4 is offline xsmid4  Czech Republic
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hello, is it safe to use 2x63V for 3 pairs of IRFP240/9240? This should give about 250W to 4 ohms. There is no problem at 1khz and 10khz, but when we go close to limitation at 100hz in 4 ohms, then all IRFP240 burn. Maybe these transistors are fake?
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Old 29th September 2011, 01:56 PM   #438
AndrewT is offline AndrewT  Scotland
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3pr of 240/9240 adds up to ~900W of output devices.
Divide by 4 for MosFETs and you get ~225.

Your target of 240W into 4r0 is close enough to 225 to be considered as reliable.

However, your target of 240W and +-63Vdc do not seem compatible !
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Old 29th September 2011, 02:12 PM   #439
xsmid4 is offline xsmid4  Czech Republic
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output stage is powered with 2x63V and input stage with 2x70V
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Old 29th September 2011, 02:37 PM   #440
AndrewT is offline AndrewT  Scotland
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I get 300W to 320W from +-58.5Vdc supply rail using BJT output stages.
A mosFET output stage may require upto 5V more on the supply rails to achieve that 300 to 320 target.

But you are showing a target of "only" 240W from supply rails that are 4.5V higher. That seems odd.
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