Hey guys.
New to the forum, well not quite new just used it as a source of information in the past. Im very keen on a F7 build. Do we have any ETA when the official schematic will be released?
Seen plenty clones being spoken about on this thread just would love to see the official version vs the clones.
So many clever guys on this forum. Keep up the great work all
New to the forum, well not quite new just used it as a source of information in the past. Im very keen on a F7 build. Do we have any ETA when the official schematic will be released?
Seen plenty clones being spoken about on this thread just would love to see the official version vs the clones.
So many clever guys on this forum. Keep up the great work all
any book having operational amplifier as subject will give you an answer
think inverted, think virtual GND
well, if you want to understand, it's possible only with your head
if looking at principal scheme of inverting OP, you have 2 resistors in NFB loop - one folding back from output to negative input, second one in series - in between source and negative input
as that, negative input can be declared as virtual GND for NFB loop, so source is having one resistor between its output and (virtual) GND, so value of said resistor can be declared as Rin of entire stage
little more complicated when having all that gismo at output (establishing current positive feedback) but roughly it's still as that
if looking at principal scheme of inverting OP, you have 2 resistors in NFB loop - one folding back from output to negative input, second one in series - in between source and negative input
as that, negative input can be declared as virtual GND for NFB loop, so source is having one resistor between its output and (virtual) GND, so value of said resistor can be declared as Rin of entire stage
little more complicated when having all that gismo at output (establishing current positive feedback) but roughly it's still as that
way above my level , i m a tube guy
Like this one?
https://www.aikenamps.com/index.php/designing-single-stage-inverting-feedback-amplifiers
I started on an F7 clone a two years ago and got halfway there, then Covid and other stuff happened that summer.
Anyway, it works, it sounds nice and all but I didn't get positive feedback working properly. If anyone inside EU (postage..) want to continue this project, give me a ping.
Boards from mareli include an unused PS board. Mosfets are Exicon Ecw20p20.
Anyway, it works, it sounds nice and all but I didn't get positive feedback working properly. If anyone inside EU (postage..) want to continue this project, give me a ping.
Boards from mareli include an unused PS board. Mosfets are Exicon Ecw20p
20.Maybe there are approximately 10K resistors across the inputs right at the connectors themselves. We don't know as there is no official schematic and by the looks of the actual boards posted by some magazines it doesn't look like any 10K resistors on the boards themselves. I have a sim and with just the 39K resistors the input impedance is 100K (Vin/Iin).