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Old 3rd January 2013, 04:40 PM   #631
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In order to power a subwoofer i planed, after been fully pleased with BOQ, to use Artck with +/-70Vdc rail and 8xIRFP450 unit in output stage. I redrawn Quasi borad for MPC071 resistor use in output stage and put DC protection relay on board. Next stap after one more checking will be board etching.

Marc
Pretty nice - I may follow your footsteps...

I hope all goes well with your project.

Cheers!
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Old 4th January 2013, 09:05 PM   #632
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Default NMOS350

Hey. I'm from Slovakia and I do not know English. I use only Google translator. I want to ask whether the author NMOS350 by Quazi. I built one piece of editing and I'd send it over. Involvement and the measurement. If so, I will ask you if you're an author, write me a mail at maduda.radoslav @ gmail.com.

Via mail to communicate better.
thank you
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Old 2nd December 2015, 10:38 AM   #633
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Dear Idefixes, Can you post Sprint file of this layout?

Thanks
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Old 2nd December 2015, 11:31 AM   #634
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Originally Posted by katiyar View Post
Dear Idefixes, Can you post Sprint file of this layout?

Thanks
Layout is under Eagle...

Marc
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Old 17th December 2015, 03:40 PM   #635
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Has any one constructed scaled down version of famous Acktrk amplifier with only one pair of Mosfet. If yes please share the layout and the circuit with revised components values.
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Old 17th December 2015, 03:57 PM   #636
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Quote:
Originally Posted by katiyar View Post
Has any one constructed scaled down version of famous Acktrk amplifier with only one pair of Mosfet. If yes please share the layout and the circuit with revised components values.
Acktrk is a PA typed amplifier, i don't think there will be many concern to a one pair version....

Marc
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Old 21st December 2015, 10:32 AM   #637
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Dear Quasi,

Can we not device some method to prevent Aktrk600 mosfet amplifier from self destruction due to thermal run away. Can T5 transistor which is being used as diode be replaced with NTC thermistor so that in the event of high temperature, the drive to T4 is reduced.

I want to construct this amplifier but am I am afraid from damage of MOSFET transistors as these are still expensive here in India. Long time back similar topology MOSFET amplifier was published by Elektor which used Siemens BUZ mosfets here NTC was used for thermal protection. Your valuable suggestions will help many constructors of this amplifier since you have designed it. Awaiting your reply.
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Old 22nd December 2015, 10:40 AM   #638
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I think BUZ are Lateral mosFETs.

Quasi's designs use Vertical mosFETs and one uses BJT.

T4 provides temperature compensation for the T5 current.
Your proposal of replacing T4 with a thermistor completely changes the operation of the tempco.
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Old 22nd December 2015, 12:54 PM   #639
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No Mr AndrewT, I did not mean this. I want to reduce the drive of T4 by putting a parallel NTS to T5 which is used as diode here. Please comment if my interpretation is correct or not. The Siemens circuit did not use lateral MOSFET's it used BUZ23.
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Old 22nd December 2015, 01:46 PM   #640
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T5 is not used as a diode.
I see T4 used as a diode.

Do you have the datasheet for the BUZ23?
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