N-channel amp.

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#121
Greg Erskine said:


Oooh Kanwar, what can I do to get on your list. I'll be your best friend. I'll even build a N-channel amp. 😀
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Oh my God, you will be my best friend, just prove it.....😉

The Saint said:
Sorry for taking offense Workhorse....

Been going through a bit laterly...

Thank you for your constructive criticism.

I am aware of the dissapation levels created in the 1kw amplifier.
and I have addressed them in later updates which I haven't put on my website.

Like you I like to keep my very best designs away from the public eye and sell them in what will be my commercial designs.

Also thanks for the tip on cross conduction in the n channel design
I have not been concerned so much with this problem as I believed it was only an issue with the likes of Class D Ampifiers.

I hope we can be friends now?
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Yeah sure Anthony, we are friends now.......

one more thing you run your 1KW amp at +-110 VDC and the Vds of the output mosfets is only 200V [IRFP240/9240] isn,t it a little bit dangerous....
I was unaware of the fact that you sell your design and they are commercial designs....sorry for the misunderstanding......

Best Regards,
K a n w a r
 
#122
Hi Workhorse

Yeah the 1kw amp now runs on 98 volt rails, so that solves the extreme voltage issue.
I had the 1kw amp originally running on 110 volts idle because I was running the power transformer on a variac which caused excessive voltage drops to happen due to higher internal impedance of the variac. the variac I use is rated at 1kva, good for testing proposes, but not much good for testing power efficency.

Looking for more power now, perhaps a Grounded bridge design would be the go.
 
#123
The Saint said:
Hi Workhorse

Yeah the 1kw amp now runs on 98 volt rails, so that solves the extreme voltage issue.
I had the 1kw amp originally running on 110 volts idle because I was running the power transformer on a variac which caused excessive voltage drops to happen due to higher internal impedance of the variac. the variac I use is rated at 1kva, good for testing proposes, but not much good for testing power efficency.

Looking for more power now, perhaps a Grounded bridge design would be the go.
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Hi Holton,

Grounded bridge Topology is patented by Crown Audio...but it is being exclusively used by QSC ...i think the patent is expired or they have granted the permission to use it.....

Why not use high Voltage N/P channel Devices from www.IXYS.com to get the rail upto +-160VDC in half bridge topology....
IRF doesnot have p-channel mosfets above 200V rating..I think

regards,
K a n w a r
 
#124
Do you prefer Workhorse or K a n w a r.



Thanks for the tip with the other mosfets, I will look into it.
All N-Channel would be another option, I have another Quasi complementry design N-channel design which I have been using for my Sub woofer Amps, sounds great and has been working well for some years now.

Have you used the IXYS fets and whats the price compered to the IRF devices.

Yeah I knew about the patent restriction, I might email crown and see if I can get permission.

Class G might be another option.
 
#126
The Saint said:
Do you prefer Workhorse or K a n w a r.

Thanks for the tip with the other mosfets, I will look into it.
All N-Channel would be another option, I have another Quasi complementry design N-channel design which I have been using for my Sub woofer Amps, sounds great and has been working well for some years now.

Have you used the IXYS fets and whats the price compered to the IRF devices.

Yeah I knew about the patent restriction, I might email crown and see if I can get permission.

Class G might be another option.
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Hi Holton,
I prefer K a n w a r! my surname😉
IXYS fets are 1.2 times costlier than IRF and i have never used them...I only use N-channel devices from APT and IRF only cheap and best solution....

Class-G would be a costlier solution as it uses 2 banks of fets for low and hi rails seprately, whynot use Class-H...only sinlge bank of fets but switched stepped supply option......and much cheaper...

mastertech said:
kanwar
"i only know one type of cross-conduction i.e. due to slow-turn-off of mosfets."

mr kanwar great to see you back
i thought this kind of problem was less critical with fets
than bjt, what type of drive do you use to eliminate
this fet problem

regards
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Its even very much great to see you too! Mr.Mastertech,

I implement individual pushpull drivers for both upper and lower fets along with floating regulated +15VDC powersupply exclusively to power the driver stage only...

best regards,
K a n w a r
 
#127
Hi!

This is one thread where I fully agree with our good friend Kanwar on each of the issues.
His suggestion of running driver and pre drivers at higher than O/P rails does makes sense to avoid cross conduction.

Just one request : How about some real design. No I am not asking you to put your commercial design but something simple that can be made by the DIY community. After all thats what we are here for.

Regards

Rahul
 
#128
Surprise

Rahul said:
Hi!

This is one thread where I fully agree with our good friend Kanwar on each of the issues.
His suggestion of running driver and pre drivers at higher than O/P rails does makes sense to avoid cross conduction.

Just one request : How about some real design. No I am not asking you to put your commercial design but something simple that can be made by the DIY community. After all thats what we are here for.

Regards

Rahul
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Are you sure these are your words! its a little bit surprising to me....A ham guy who always trying to ditch my postings earlier now says agreeing with me.......
Well Best Regards,
K a n w a r
 
#130
Another stripp off by ham guy

Rahul said:
HI!

Yess boss just to doubly ensure.

BTW looking for simple MOSFET designs from you too. Come on you can do it.

Regards

Rahul
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Ah Mr. Rahul come on i am not your boss! i am a simple human being....
how come you now believe that i could do a nmos design too..earlier you simply strip me off in every posting ..but i remain silent due to one reason..that i have have huge business to take care off and have no time to fight with you...when i would have the sufficient time i would really like a face to face interaction at your place not on this forum...

cheers,
K a n w a r
 
#131
i am not your boss! i am a simple human being
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Hi! Mr Kanwar

Today it appears is not my day.My actual Boss who also is a DIY fan gave me L&R for the wrong referral, I take back my refrance of the same to you. As a punishment I now will be making a ZETA for him.


i have have huge business to take care off and have no time to fight with you.

Aaaaah!!!!!!!!! me time to fight either, I very well understand the commitments of a such a huge setup, internantional, national and local village. Then further more so many loose threads on the forum awaiting your reply. ah yes the com site.

Better get myself moving have some serious DIY to do.

Regards

Rahul

PS: No hurry take your own sweet time. The show goes on, Earth is still spinning.
 
#132
Thats the real Rahul speaking now, with no hiding under the covers, same old type postings, thanks for your postings again...

Build the Zeta and Mr. Lars Clausen would be happy too....
Ahhhahaa...Rahul the ham guy strikes again...litlle bit amazing...

K a n w a r
 
#139
😀 😀 😀 😀 😀 😀 😀 😀

Some people realy dont get the message .

The Smilies stands for:

Joker ----------- Junk -----------Liar

Next time Ill support with comment of others right from the era of the amp_mens , the late night bros using ur IPs etc etc.

For now as an eg allow me to quote yourself from one of your post:

Amp_Man,
Click to expand...

Do something good for community.

Regards

Raahul

PS: Hope by now your as well as huge com problems should have been solved
 
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