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 ...
Give your advice if you don't want mine failure
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 partThat'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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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
Ok. i will start with these suggestions and i will report again.
Thanks/
Thimios.
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.
on 4 Ohm load
thimios has 6 Vpp at 150 kHz
Show me your's amp 200 kHz at 20 Vpp square wave under 4 Ohm load
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 ?
What about foto with load 4Ω - scope square wave at 200khz . at 20V p-p as you say ?
Attachments
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
Attachments
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.
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
No competition. We just explore the capability of CFA and then search the best sounding amp
In my opinion it vent off the track.
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.
No competition. We just explore the capability of CFA and then search the best sounding amp
Exactly, persuit is on.
