The F5X Preamp

[NicMac]

best looking 2 x +/-16V (?) I have seen in a long time

 

[EUVL]

2x +/-24V cap multiplier with current limit set at 0.8A.
And auxiliary PSU with 24V 0.5A.

R-cores are from Phoenix Japan.


Patrick

 

[CeeVee]

That's wicked Patrick.....
Phoenix invented the R-Core....expect the best but how do we get them in Europe at a "decent" price ?

Best we got here is Selectronic's Indian made ones ( at least easier to get ).

Since your's fit just right in the case i will check how selectronics fit...ie: compare dimentions.

....and alas Phoenix does not ship abroad for individuals.

 

[EUVL]

Someone bought for me in Japan.
Was VERY expenive ......

But then no reason not to use toroids.


Patrick

 

[CeeVee]

I know that they are VERY expensive.....that's why you leave everyone drooling....

I will try the Selectronics.

 

[Nikon1975]

I might still have a way to bring some Phenix, I have to check the timing

 

[CeeVee]

Ok Checked....80VA Selectronics will fit nicely.

 

[EUVL]

http://www.pnxcorp.co.jp/ra/rasunpo.htm
RA80.


Patrick

 

[NicMac]

What are the transformer specifications?
I like toroids (in particular custom made ones) and if Patric says no reason not to use such - I will go for this
I might well have better returns spending the money on 4x R-cores for my SEN to get rid of batteries

 

[CeeVee]

‚q‚`ƒVƒŠ�[ƒY�@�¡–@•\
RA80.


Patrick

in terms of size Phoenix is 23mm wider ie: Phoenix 124mm - Selectronix 101mm, other dimentions are similar.
weight: Phoenix 1.4 kg...Selectronics: 1.3kg.

Electromagnetic characteristics....well that remains to be seen.

 

[EUVL]

A Toroidy TSA100 will fit nicely.


Patrick

 

[CeeVee]

yes....checked that as well, choices.....

115mm Diameter, 60mm high.

 

[EUVL]

95x41mm.
TTSA0100 - Transformer AUDIO TSA100VA - voltage to 50V - Shop Toroidy.pl


Patrick

 

[CeeVee]

Right...that is for the uncased one.

The one with the case is the bigger one......Juuuuuuuuuuuuuuuuuuuuuuuust fits.

 

[EUVL]

Someone asked about news.

Unfortunately not much.
All hardware ready, only waiting for the control software.
But the software guy is SUPER busy, so hobby has to wait.
I am hoping for some progress in December, as I also want to test this, after finishing 7 headphone amp designs this year.


Patrick

 

[samoloko]

thanks Patrick
what do you think about Muse chip volume control

 

[EUVL]

wuffwaff,

Please kindly check PM.


Happy New Year,
Patrick

 

[Nikon1975]

Patrick,

Were you planning to put the gain stage before or after the volume control?

 

[EUVL]

After.


Patrick

 

[Nikon1975]

Can I ask you why that? The F5-x has 100k impedance, so it does not need much current to be driven. The source is usually an unknown.

Thanks,

D.