Kanwar Bhai PCB apne liye banani koun sa bechna hai sorry time nahin
Koi farak nahin padta doosra conventional layout bhi kar lenge
duniya walon ko dekhne do . Mera amp ban jayega apka wada poora hua. Shukriya
Sorry no intention on copying any ones concepts. Please give a feed back for improvement on layout and ckts.
Regards
Rahul
Mera Bharat mahan. Even Alexandar was impressed with us.
Koi farak nahin padta doosra conventional layout bhi kar lenge
duniya walon ko dekhne do . Mera amp ban jayega apka wada poora hua. Shukriya
Sorry no intention on copying any ones concepts. Please give a feed back for improvement on layout and ckts.
Regards
Rahul
Mera Bharat mahan. Even Alexandar was impressed with us.
Oh Rahul, jab amp rock karega..tab sabhi guys pcb ko khareedna chahenge, mein tere ko kisi ki nakal karne ko nahi kah raha , aur na hi kabhi kahunga....
I dont want you to copy anyone's concept, nor i would encourage you to do so...
Gate Driver Transistors ko mosfet ke Gate ke nazdeek karo nahi to turn-off mein garbar ho jayega
differential transistor ko centre mein rakho , jo ki symmetry mein help karega...
regards,
K a n w a r
I dont want you to copy anyone's concept, nor i would encourage you to do so...
Gate Driver Transistors ko mosfet ke Gate ke nazdeek karo nahi to turn-off mein garbar ho jayega
differential transistor ko centre mein rakho , jo ki symmetry mein help karega...
regards,
K a n w a r
anatech said:
Oh dear Chris,
I was using "Hindi" the Indian national language in English text.....so it becomes HINGLISH😀 😀 😉
regards,
K a n w a r
Hi Kanwar,
I feel so much better now, thank you.
Can we get on topic, in english, so others can follow you guys again?
-Chris
I feel so much better now, thank you.
Can we get on topic, in english, so others can follow you guys again?
-Chris
Oh!
Its nothing much, I once commented ina post that PCB would be similar to one N ch amp made by Quasi.
Kanwar suggested to do a new layout rather that to follow some one elses design/concept.
I think summarises it well enough.
BTW given the 4 device approach gate drive track would tend to be long but you have already proven it works on vero board so I am confident of better results on PCB. Will optimise it further to the best of my knowledge.
Regards
Rahul
Its nothing much, I once commented ina post that PCB would be similar to one N ch amp made by Quasi.
Kanwar suggested to do a new layout rather that to follow some one elses design/concept.
I think summarises it well enough.
BTW given the 4 device approach gate drive track would tend to be long but you have already proven it works on vero board so I am confident of better results on PCB. Will optimise it further to the best of my knowledge.
Regards
Rahul
HI!
Frankly Kanwar I would prefer a double sided PTH layout. Unfortunately it is impractical for DIY project.
I will just give the amp a real burn in , no one knows whats in store for future.
Regards
Frankly Kanwar I would prefer a double sided PTH layout. Unfortunately it is impractical for DIY project.
I will just give the amp a real burn in , no one knows whats in store for future.
Regards
Hi Folks,
I am going to turn this version in Class-H amp for 1KW power levels,...So just stay tuned guys.
regards,
K a n w a r
I am going to turn this version in Class-H amp for 1KW power levels,...So just stay tuned guys.
regards,
K a n w a r
WOW, Ampman swings his magic stick high... again! 😀
Staying tuned to see what you come up with this time.
Cheers Michael
Staying tuned to see what you come up with this time.
Cheers Michael
Kanwar,
Try adding a reverse biased diode in parallel with the gate resistors for the outputs. If helps the turn-off characteristics considerably. I use such an output circuit for my modulator amp at 1.2Ghz with the IRF hex-fets.
I use 390 ohm resistors instead of 4.7K ones in this circuit, and 1A rated TO-5 cased push-pull drivers. It has to sink a lot of current from the gate charge to turn off quick and clean.
Try adding a reverse biased diode in parallel with the gate resistors for the outputs. If helps the turn-off characteristics considerably. I use such an output circuit for my modulator amp at 1.2Ghz with the IRF hex-fets.
I use 390 ohm resistors instead of 4.7K ones in this circuit, and 1A rated TO-5 cased push-pull drivers. It has to sink a lot of current from the gate charge to turn off quick and clean.
Hi DKJ,
The Funtion of Reverse bias diode anti parallel with gate resistor is to decrease Turn-off time and that is already achieved by the PNP transistor shunting the gate to source drive in the amp.....
regards,
K a n w a r
The Funtion of Reverse bias diode anti parallel with gate resistor is to decrease Turn-off time and that is already achieved by the PNP transistor shunting the gate to source drive in the amp.....
regards,
K a n w a r
Hi Kanwar,
as promised I stayed tuned! 😀
Actually not bad!
Do you know the dv/dt of the additional voltage both when swithing in and out?
Cheers Michael
as promised I stayed tuned! 😀
Actually not bad!
Do you know the dv/dt of the additional voltage both when swithing in and out?
Cheers Michael
Ultima Thule said:Hi Kanwar,
as promised I stayed tuned! 😀
Actually not bad!
Do you know the dv/dt of the additional voltage both when swithing in and out?
Cheers Michael
Yes the maximum transient without Snubber was rising very sharply as high as VCC, but again you have the snubbers to do their job and they really done well by snubbing the transients +-10V max above or below the VCC!
I forget to mention, i also used snubbers across the output devices also...And all diodes were Soft recovery SCHOTTKY types
Yes Michael, you stayed Tuned to my station.....😀
Cheers
K a n w a r
Maybe I expressed a bit unclear, the snubbers are there for surpressing the ringing no doubt about that, but can't do much about the dv/dt rise and fall time of the rails voltage when the FET switch in and out the higher rail voltage, I meant do you know the dv/dt rate of the rail voltage supplying the amplifier when the additional higher rail voltage is switched in and out by the switching FET?
My believe is it is not good to switch too fast, besides RF components arising from very fast switching times also the amplifier is directly affected through the Miller capacitor, so my concern is that it might degrade the sound quality while thats probably not any big concern for PA equipments it is at least for home use with much accurater loudspeakers revealing small artifacts.
6N137 is quite a fast one... but "fastest" is not always the best sollution! 😎
Cheers Michael
My believe is it is not good to switch too fast, besides RF components arising from very fast switching times also the amplifier is directly affected through the Miller capacitor, so my concern is that it might degrade the sound quality while thats probably not any big concern for PA equipments it is at least for home use with much accurater loudspeakers revealing small artifacts.
6N137 is quite a fast one... but "fastest" is not always the best sollution! 😎
Cheers Michael
If you turn on the mosfet slowly then you have to widen the envelope to accomodate the high rise slewing of output voltage and again you loose a bit of efficiency by widening the envelope.....
The RF components are much likely to put an impact on the sound quality, but i donot hear the difference when playing music with same amp in CLass-B mode....
I havent yet measured the the dV/dT of switched bus of amp.....
Do you have any suggesstions for further improvement,...
I go for fast turn on because when the amp is fed with high frequency signal the Rail Locking occurs which would destroy the output devices in a very short time....if you use slow turn-on the rail locking is evident to happen....due to narrow pulses of high frequency envelope..
Cheers
K a n w a r
The RF components are much likely to put an impact on the sound quality, but i donot hear the difference when playing music with same amp in CLass-B mode....
I havent yet measured the the dV/dT of switched bus of amp.....
Do you have any suggesstions for further improvement,...
I go for fast turn on because when the amp is fed with high frequency signal the Rail Locking occurs which would destroy the output devices in a very short time....if you use slow turn-on the rail locking is evident to happen....due to narrow pulses of high frequency envelope..
Cheers
K a n w a r
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