To do this, I would guess that the LED's would need to be a string of 5 or so, to allow for its 20V+ gate charge. We are assuming it also has less distortion than IRF240 and similiar sound to R100. Won't know until you try.
boyz
are we looking at same datasheet ?
Yup, I just didnt have my glasses on. Using those big number threw me. Looks like 4-5V range. I am ordering some to compare. Hopefully they will perform similarly and open up another option for others interested in the project. Certainly very nice looking curves. May not be as good as SS, but could be.
CMF10120D Cree, Inc. | Mouser
some more news...
the Edcor and the Jensen were working at very different distortion levels from the starting point..compared in the same channel.
Edcor with a k2 distortion lying 12db higher than the k3 and THD 0,046%
Jensen with a k2 distortion at the same level than the k3 and THD 0,0158%
so the Jensen was a bit too bright and the Edcor better but a bit too faaaaat.
And thanks Mr. Pass! Never it was more easy to tune the k2 corresponding to k3 than by putting in a 1k pot parallel to the upper secondary winding!
Now I set (only the Jensens at the moment, Edcors will follow..)
Jensens k2 about 8db higher than k3, THD at 0,045% and that is a very nice sound now, no comparison to the first try!
All data are from the left channel, the more worse channel, the right channel has lower THD values with these mix, about 0,035%.
So I will look for the SemiS pairing if I can get lower values on the right channel too...
I am still irritated, this circuit should be k2 dominant, because of SE character or k3 dominant, because of canceling of lower and upper half....?
the Edcor and the Jensen were working at very different distortion levels from the starting point..compared in the same channel.
Edcor with a k2 distortion lying 12db higher than the k3 and THD 0,046%
Jensen with a k2 distortion at the same level than the k3 and THD 0,0158%
so the Jensen was a bit too bright and the Edcor better but a bit too faaaaat.
And thanks Mr. Pass! Never it was more easy to tune the k2 corresponding to k3 than by putting in a 1k pot parallel to the upper secondary winding!
Now I set (only the Jensens at the moment, Edcors will follow..)
Jensens k2 about 8db higher than k3, THD at 0,045% and that is a very nice sound now, no comparison to the first try!
All data are from the left channel, the more worse channel, the right channel has lower THD values with these mix, about 0,035%.
So I will look for the SemiS pairing if I can get lower values on the right channel too...
I am still irritated, this circuit should be k2 dominant, because of SE character or k3 dominant, because of canceling of lower and upper half....?
Last edited:
what's the price ?
edit:
dumb zm
didn't clicked on link , thought it was for datasheet , not to Moussss
The transconductance appears to be very low at about 3.5S at Id=10A. I haven't estimated the input capacitance.
The curve is not linear at ~1.5 A. How does it compare side by side with that of R100 or other MOSFETs made popular by Mr. Pass?
N.B.
- The curve of Idss v.s. Vgs for R100 appears relatively more linear [eyeballing] than for Cree semi.
- The curve of Idss v.s. Vgs for IRFP240 is different from both of the above. Nonetheless quite linear in the idle bias region 0f 1-2 A.
Last edited:
Plot it at different Vds and datasheet posted by ZM looks good to me. Could be viewing it with same glasses as before.
If not xformer, slap a diff pair in front for more gain and you might have soemthing nice. As a matter of fact, may be worth trying in the AJ. ACA is also an option.
If not xformer, slap a diff pair in front for more gain and you might have soemthing nice. As a matter of fact, may be worth trying in the AJ. ACA is also an option.
Last edited: