post deleted...I now understand the previous post...
t means transistor!
even more lateral fets
#76 Re: even more lateral fets
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#77 Re: even more lateral fets
Yes, that is what I meant.Is it this capacitor that you were referring to. If so, do you think I can just move it from the output of the buffer to the output of the opamp
Re current drive to the MOSFET, you can put the ammeter probe over the MOSFET gate pin (or the 220R) and see what the gate current is with a 10 kHz squarewave. I'm guessing the gate cap could be 1,000 pF or more, would be interesting to see what it shows.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#78 Re: even more lateral fets
last installment, I hope...
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#79 Re: even more lateral fets
Looks fab, have you done a frequency response plot?
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#80 Re: even more lateral fets
mmmm...
There's nowhere you can be that isn't where you're meant to be
#81 Re: even more lateral fets
and here is the original mofo...
I seem to have lost the plot
I seem to have lost the plot
There's nowhere you can be that isn't where you're meant to be
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#82 Re: even more lateral fets
OK, looks flat in the right places.
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#83 Re: even more lateral fets
Does the top-end sound a bit duff, Ed ?
It doesn't look like much , but I know from the current-sourced filament supply project a few years ago with Nick and Andrew that small phase rotations up there can make or break the sound.
It doesn't look like much , but I know from the current-sourced filament supply project a few years ago with Nick and Andrew that small phase rotations up there can make or break the sound.
"Once you find out ... the Circumstances ; then you can go out"
#84 Re: even more lateral fets
Though I am not sure how we can know that that effect in a heater supply will have the same effect in a power amp (or for matter we also don't know it wont). But we do know that loads of folk are more than happy with output transformers that are more than 0.1dB down at 20k.IslandPink wrote: ↑Mon May 22, 2023 12:01 am Does the top-end sound a bit duff, Ed ?
It doesn't look like much , but I know from the current-sourced filament supply project a few years ago with Nick and Andrew that small phase rotations up there can make or break the sound.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.