F5 Headamp ?

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#861
I have taken the liberty to change your spice model as follows :

1. your name and not mine (not my model)
2. gain ~ 5x
3. RLOAD 50R
4. Vout ~3.6V
5. MOSFET bias ~ 150mA instead of 1A
6. DC Offset at Vout < 10mV

After running, press Ctrl L to see THD results.
And I have included a frequency response asc.

Fairchild models are available from their website.
But I suggest you get up to speed with Spice first before attempting those.


Patrick

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#866
If you take the ba-3 front end, add feedback like the vfet 2 front end, bias heavy and cross your fingers you may be able to get rid of the output caps and the output impedence would be favorable. Haven't done it but I know someone who has.
 
#868
RollE2k said:
The biggest downside with the 317/337 is still the >3V dropout. especially on lower voltage circuits. We are still talking simple to220 devices with a few caps. Although it would be fun to A/B with a more "fancy" supply - if it did work that is.
i'm quite certain Salas would work - but you may need a small series resistor before the elyt caps, which maybe will degrade some of the performance. But still would be fun to compare.
I will probably remake my boards with LDO + cap multi though, to save some space in my case.
Click to expand...

are you really preffer 317/337 series to Salas Shunt reg
 
#871
I was asked by PM about what to do with unmatched JFETs.
Next time I would appreciate that you ask your questions here and not by PM.

For unmatched JFETs you will be able to compensate for the resulting DC offset at the output using the trimmers.
But you will not be able to do much about the increased even harmonic distortion as a result.


Patrick
 
#874
pchw said:
Do you have problem with Patrick? You have expressed your one's opinion not liking this HA in many occasions.

X, this looks like Stixx's new favorite now.
Click to expand...

Haha, LOL. The new show: the DAO all FET SE class A HA does look quite splendid indeed, but the simplicity of the F5HA still takes the cake in my opinion.

http://www.diyaudio.com/forums/atta...ne-amplifier-dao-se-public-part-2a-121214.pdf

Funny thing is, I just got a bag of 2SK2013's burning a hole in my pocket lookin' for a project. This may be it...

I don't know anything about the LU104D though...

My hat's off to Patrick for making these fabulous designs available to us. They can clean house with some serious commercial head amps I think.
 
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#877
ammel68 said:
Is it really any of your business if I do or don't? I didn't think so.

We're all here to discuss this headphone amplifier.

Don't try derailing the thread by bringing up personal issues with either me or Patrick.[/QUOTE］
Derail? Yes, I apologize to Patrick and others for last and this post, and no,
I have no personal issue with anyone. I was just puzzled and bothered by your continued jab to this HA in the discussion.

Mods, feel free to remove or to edit last couple posts from me.
Click to expand...
 
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