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Old 5th May 2017, 01:03 PM   #21
Stixx is offline Stixx  Germany
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There is a wide range of power supplies you could use. The cap multplier psu I was using for testing
was quite simple but working flawlessly, and best, didn't have an impact on sound. Maybe it could
also be refined some with a pre-regulator?? (thinking out loud)

For the F5 HA I used the so-called Nazar reg that also is very compact, is dead quiet and has relatively
low heat sinking requirements. Shoot me a PM and I can supply you with the schematics.

Please stay away from the Salas shunt regs because they haven proven instable on such a
high bandwidth amplifier and generate too much heat here.
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Old 5th May 2017, 11:49 PM   #22
analog_sa is offline analog_sa  Europe
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Quote:
Originally Posted by Stixx View Post

Please stay away from the Salas shunt regs because they haven proven instable on such a high bandwidth amplifier

Really? Never had stability issues with those in dozens of applications...Never had any other regulator even approach them sonically...
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Old 6th May 2017, 05:31 AM   #23
EUVL is offline EUVL  Europe
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Yes, big oscillation with the Salas on the F5HA which cannot be tamed even after adding a 20R power resistor in between.

And we like the Didden regulators more if we have to used ones with low Zout.
(You can also change that to a shunt.)

But everyone chooses what he likes.


Cheers,
Patrick
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Old 11th May 2017, 07:22 PM   #24
Morde is offline Morde  Finland
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A question regarding the MOSFET Vgs matching diagram presented in the appendix 4: With the given values of R1=87R and R2=870R I get Idss=0,134V/R1=1,5mA. Should the values be R1=0,134V/8mA=16,75R and R2=167,5R ??? Or is there something that I didn't understand (quite possible)?
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Old 11th May 2017, 07:41 PM   #25
EUVL is offline EUVL  Europe
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You are correct. My careless mistake.
Apologies.


Patrick
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Old 11th May 2017, 08:11 PM   #26
EUVL is offline EUVL  Europe
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I can edit Post #1 but not change the attachments.
So I post the revised version here.


Patrick

.
Attached Files
File Type: pdf UTHAiM Public 170511 Part4.pdf (553.2 KB, 97 views)
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Old 14th May 2017, 11:49 AM   #27
Morde is offline Morde  Finland
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While I'm impatiently waiting for my parts to arrive, I've been wondering what would be suitable impedance value for a volume pot? It's beyond my capabilities to derive the input impedance of the UTHAiM from the schematics, so that I could match the pot value for good results. Please enlighten me Patrick.
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Old 14th May 2017, 12:01 PM   #28
EUVL is offline EUVL  Europe
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I use 10k.
JFET input, not critical.


Patrick
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Old 16th May 2017, 12:45 PM   #29
Morde is offline Morde  Finland
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Phew! Now I'm done with the ZVN matching. It took couple of hours, but I think I managed to find quite good quads from the 32 pieces of both P/N channel mosfets.

In the attached picture ZVNs are on the left and ZVPs on the right.
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Old 16th May 2017, 02:20 PM   #30
EUVL is offline EUVL  Europe
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The match between Q3,4 and Q5,6 are more important than Q7,8 and Q9,10.
The formmer defines the current mirror, the latter are cascodes to provide the same Vds for those.

So I would use the best quads for Q3,4 and Q5,6 in the 2 channels.


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