Hmmm. Did I get lucky ? I ordered 4 instead of 2 SS devices. 2 for babelfish 2j .....
Just what I was thinking 🙂
Needed to use some tricks. 😉
Just wanted to see if DC couple is possible.
Looks like it is.
Cheers,
Patrick
Just wanted to see if DC couple is possible.
Looks like it is.
Cheers,
Patrick
Hi Patrick,I tried to simulate your scheme with two IRFP240. Without changing anything it, works very well.
Different Idss
The spice file posted yesterday has a P-JFET with Idss of 6.5mA.
I checked also Idss 8mA, which is also possible with some adjustments of resistor values.
The updated files here also has an adjusted bias of 1.3A.
Distortion sink further to < 0.014% for the lower Idss version.
So there are enough knobs that you can use to tailor distortion level, DC offset, and bandwidth, to the difference in devices.
It is important to realise that these are just simulations and not reality.
But I shall stop here in any case.
Cheers,
Patrick
.
The spice file posted yesterday has a P-JFET with Idss of 6.5mA.
I checked also Idss 8mA, which is also possible with some adjustments of resistor values.
The updated files here also has an adjusted bias of 1.3A.
Distortion sink further to < 0.014% for the lower Idss version.
So there are enough knobs that you can use to tailor distortion level, DC offset, and bandwidth, to the difference in devices.
It is important to realise that these are just simulations and not reality.
But I shall stop here in any case.
Cheers,
Patrick
.
if we go step further, we can compare it with Loftin-White
🙂
and just a little toe more, with anything having 3 resistors and 1,5 actives in it
nature of things when you are in stripping business
🙂
and just a little toe more, with anything having 3 resistors and 1,5 actives in it
nature of things when you are in stripping business
Today my spreadsheet told me that I have to update the First Watt
website, and so I did.......
......
Oh no, he did it again
Attachments
> F8 has no phase splitter. (JLH Q2)
> That is a very significant difference
The phase splitter is not necessary a disadvantage.
Can even be an advantage.
Patrick
> That is a very significant difference
The phase splitter is not necessary a disadvantage.
Can even be an advantage.
Patrick
Not saying which is better just that it's a significant difference
JLH has something like 2.5 or 3 gain stages depending on your definition.
F8 has 2 gain stages.
It's Different not really similar.
JLH has something like 2.5 or 3 gain stages depending on your definition.
F8 has 2 gain stages.
It's Different not really similar.
That would be like saying there is no voltage gain out of the input transistor of a folded cascode front end.
Pretty sure you have voltage gain out of the collector of Q2 which then goes to the base of the upper transistor Q4 which provides some current gain.
Out of the emiiter of Q2 you have current gain and then voltage gain on the lower output device Q3.
Pretty sure that's what you have.
Pretty sure you have voltage gain out of the collector of Q2 which then goes to the base of the upper transistor Q4 which provides some current gain.
Out of the emiiter of Q2 you have current gain and then voltage gain on the lower output device Q3.
Pretty sure that's what you have.
Last edited:
If you consider a gain of -1 is gain, then yes.
Phase Splitter - Electronics-Lab.
I shall also stop. 😉
Cheers,
Patrick
Phase Splitter - Electronics-Lab.
I shall also stop. 😉
Cheers,
Patrick
My point was it's bloody different.
I'm not wrong.
You chose to argue over something totally unrelated.
I'm not wrong.
You chose to argue over something totally unrelated.