I read the following article by NP: https://diyaudiostore.com/pages/idss-choice
My question is can I use the A grade FETs 2.6mA Idss in audio application (mostly Pass projects) even after NP recommendation above?
And why are the A versions so much more expensive.......were they designed for non audio application?
Regards, Vinay
My question is can I use the A grade FETs 2.6mA Idss in audio application (mostly Pass projects) even after NP recommendation above?
And why are the A versions so much more expensive.......were they designed for non audio application?
Regards, Vinay
It has to do with variation in the production process.
They manufacture a lot and then sort them by Idss.
If a certain sort is rare, those will be priced higher 😎
Jan
They manufacture a lot and then sort them by Idss.
If a certain sort is rare, those will be priced higher 😎
Jan
With proper design, there is no issue. Perhaps it may be better or worse than others, but any device centered in its transfer characteristics may be used. Including logic gates: feeding back with a resistor of high value, a CD4069 or a 74HC04 may be used as low gain devices. And they do.
For some reason I cant see how they can make a viable profit if the tested and sorted every device made, even with automated testing. But I dont know semiconductor fab operate.
I would expect the sorting is fully-automated and most likely built into the final QC/packing process anyway (so the devices are being tested and measured more or less at the same time as being packaged). The equipment required is probably pretty expensive to buy, but once you start producing millions and millions of devices the margnal cost per device is very low.
The manufacturer has to deal with variability per lot and sort as such. This is automated at the fab.
Matched Jfet from the store here are done by hand.
Matched Jfet from the store here are done by hand.