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Old 12th December 2012, 05:36 AM   #31
EUVL is offline EUVL  Europe
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The circuit in the link above is a Blowtorch variant with Zeroo Global Feedback (ZGF).
One goes about the design of a ZGF circuit quite differently to that with global feedback, though the topology might look the same at first sight.

This is the post from John I referred to :
JC-80 eBay PCBs & Power Train

You can see even the same feedback topology of the F5.
And since the schematics is dated 1983, you may also argue that the F5 is a derivative of the JC-80.
We set out to make a F5X low power version as preamp with TO220 output devices, and landed by happy coincidence at the JC-80.
(Our simulations and PCB layout dated back to 2011, before John published his schematics.)

So again, all credit to John.


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Old 12th December 2012, 11:02 AM   #32
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OOH i can see we are going to enjoy this thread...and making the preamp!

Great looking prototype boards Patrick.
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Old 12th December 2012, 01:00 PM   #33
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Part 2 of the article this weekend.

In the meantime, enjoy the thermal design articles.
F5X -- the EUVL Approach

Quite a few surprises, even for me .....




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Old 12th December 2012, 01:07 PM   #34
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sounds like it could make a nice 'little' headphone amp =)
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Old 12th December 2012, 01:10 PM   #35
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Is there a phono stage with this preamp?
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Old 12th December 2012, 01:22 PM   #36
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> sounds like it could make a nice 'little' headphone amp =)

Nothing will beat the DAO SE, which we shall publish in January.

> Is there a phono stage with this preamp?

There is so many excellent design from John Curl.
Why not just choose one of those ?


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Old 12th December 2012, 01:30 PM   #37
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I wasnt suggesting that, just that the JC80 type circuit/s have been used by many as a headphone amp, so i'm sure this will too.

i'll build the DAO circlotron if/when you release the article for that version (may try the SE before then, or is this just the standard tailored version?), I have matched up most of the parts just never got around to building it (circ version), too many projects. mainly because it will require more test gear and time than I have available to find proper values/operating points based on the specific active devices I have in my possession.

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Originally Posted by EUVL View Post
> sounds like it could make a nice 'little' headphone amp =)

Nothing will beat the DAO SE, which we shall publish in January.

Last edited by qusp; 12th December 2012 at 01:44 PM.
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Old 12th December 2012, 01:39 PM   #38
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Quote:
Originally Posted by Mr. dB View Post
Is there a phono stage with this preamp?
Heard of Paradise ?
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Old 13th December 2012, 03:13 AM   #39
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Patrick,
Sorry by my intrusion on the thread and you are right I did not read the introduction on the pdf, my apology for that since I only looked at the schematic that just rang the bell and reacted.
I do appreciate your professional approach to circuits and impeccable work on your amplifiers.

My best wishes,
Antonio
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Old 13th December 2012, 03:21 AM   #40
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No problem at all. Thank you for your interest.


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