Need more slew rate.Look thimios how 200 kHz square waves under load should look from good CFA. You still have to do some work on this design hehe
I hope, after thimios do experiments that I suggested, it can produce good 200kHz square wave...
Look thimios how 200 kHz square waves under load should look from good CFA. You still have to do some work on this design hehe
Give your advice if you don't want mine failure😉
That's what I call parameters fine tuning. One has to play with everything, parts types & values, bias currents, compensation scheme, PCB layout, wiring ...
There's not only one thing to point out, just start with bimo suggestion first. 😉
this time i can play with parts value only ,if you can give some advice,or with compensation sheme too.I haven't any special part😡That's what I call parameters fine tuning. One has to play with everything, parts types & values, bias currents, compensation scheme, PCB layout, wiring ...
Ok. i will start with these suggestions and i will report again.
Thanks/
Thimios.
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Don't worry about parts. You can use your trash bin 😀.
Don't worry about layout, OS always made good layout 😎
After you able produce good 200kHz square wave, I want to know if there any different about the sound, specially at high frequency.
I have done a question earliest on firstone thread #156 post
Have you tried to go the amplifier at full peak to peak not 20v p-p?
You say:
Of course up to 20 kHz, but not at 200 kHz since that would evaporate zobel resistors getting 10 times more power dissipation as they intend to.
Can you give us a direct foto with load 4Ω - scope wave at 200khz . 20V p-p ?
Higher than 20 Vpp at 200 kHz is not possible in my setup since that would overheat 3 W SMD zobel resistors on my PCB. Zobel filter alone has 16 Ohm impedance at 200 kHz.
What about foto with load 4Ω - scope square wave at 200khz . at 20V p-p as you say ?
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Look thimios how 200 kHz square waves under load should look from good CFA. You still have to do some work on this design hehe
My 200kHz @ 20V p-p (4 Ohm) 😎
Yours is still a bit better, but I still have some room for fine-tuning 😉
360 nS rise/fall looks not bad IMHO
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My 200kHz @ 20V p-p (4 Ohm) 😎
Yours is still a bit better, but I still have some room for fine-tuning 😉
360 nS rise/fall looks not bad IMHO
Valery
Not bad not bad.
Thimios try to low the c2=47pf c10=5.6pf c9=5.6pf like Lazy Cat, no input cap =Good Gen with zero offset and you get 200khz .
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My 200kHz @ 20V p-p (4 Ohm) 😎
Yours is still a bit better, but I still have some room for fine-tuning 😉
360 nS rise/fall looks not bad IMHO
Way that competition in square wave at 200 kHz?? This is an audio amp and no one showed in any blind listening test(all here are just subjective opinions or selling advertisements) that so high RS(over some needed level) gives better sound. For someone a higher distortion amp could sound better at heights and that could be just result of high distortion harmonics.
he he don't worry friends
Here it is ....1)300KHz/4R DUMMY LOAD.
2)200KHz/4R >> >>
3)500KHz/4R >> >>
Here it is ....1)300KHz/4R DUMMY LOAD.
2)200KHz/4R >> >>
3)500KHz/4R >> >>
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But how make it so fast do you have new PCB layout , do you bye new parts, do you raise the bias current or change compensation scheme ?
oh!! friend i dont like it your point you must get clear 1 Mhz square wave .
Maybe the other member has that point.
No competition. We just explore the capability of CFA and then search the best sounding amp 😎
More transparent and less harsh sound is what never goes off the track. If what you see here helps, why bother. Some guys would never hear the difference anyway, but that's another story.
