Paradise Phono Preregulator

[Albundi]

Yes, i´m in for one!

 

[apwolff]

me 2

 

[yokomo]

I am in for 1 stereo set

 

[Holger Barske]

Guys - as much as I like the idea of everybody ordering something he has no idea of what it really is - perhaps it is a little bit early for that. I am sure we will have a proper order sheet set up when we know what we are talking about.

 

[Benedetto]

Dear Holger,
until everything is said and done, this is just a chance
to see what level the interrest of builders reaches.
No one of the subscribers will be forced to buy anything
they allready do not know about.
And i do think this much is crystal clear for everybody,
allmost...

 

[MaHo]

Hey

great
count with me

Martin

 

[Ginum]

+2

 

[robingerhard]

hi

2

 

[buzzforb]

Check. Just subscribing to follow.

 

[Werner Hammelmann]

Dear Peter
If you will start with GB, dead sure a set for me. You need a hand ??
Give me a shout!!!
Werner

 

[Benedetto]

Hello Werner,
i think we ll meet at K.feld,
there we can talk about details.
CU

 

[Werner Hammelmann]

Hi Peter
Will be there together with friends around two pm Saturday
For details I send you a PM or give you a call.
Take it easy
Werner

 

[Joachim Gerhard]

Here is the basic schematic diagram of the Paradise Pre Regulator.
You can see the correct use of common mode chokes and ripple reducer coils ( me thinks ).
The common mode coils are rather small in physical size. They are optimized to remove HF/RF noise.
The filter chokes are much bigger in size and work in the audio band by reducing ripple on the DC power line. They form a pi filter with the 10.000uF caps. This chokes have quite a high DC resistance so they burn some voltage. For a current draw of 200mA they drop 8V. That is the reason i chose a main transformer with quite high voltage, in this case a Hammond 2 x 28V model. Other transformers can be used. I prefer Block split bobbin, others may like RCore although i heard that the cheep ones from france ( made in india ? ) are not that good.
There is a wide choice for the diodes too. UF4004 is good enough i think but maybe the crowd likes ultra fast, soft recovery diodes in TO220 cases. I will use Panasonic THS elcaps. Others may like F&T, RIFA, Mundorf etc.

 

[brozatus]

Hello Joachim,

I have already transformators,
2 x 24 V 20 VA

Can I use them without any changes?

Thanks,
Christoph

 

[MSize]

I´m also in for 1 stereo set

Thanks Marko

 

[analog_sa]

Here is the basic schematic diagram of the Paradise Pre Regulator.

Great, but calling it a pre-regulator is kinda misleading, isn't it?

 

[Benedetto]

This title was chosen because it was mentioned on MPP thread before...

 

[Joachim Gerhard]

2 x 24V may work but the Hammond chokes drop a lot of voltage.
There are other Hammond chokes that drop less so i have to search one for you that works.
This Pre-Regulator has some regulation although passive so why not calling it a Pre-Regulator ? The main regulators are on board, the shunts.

 

[brozatus]

2 x 24V may work but the Hammond chokes drop a lot of voltage.
There are other Hammond chokes that drop less so i have to search one for you that works.

That would be nice, glad to hear I have not to buy them twice.


Do you know about the size of the pcb's?

Thank you,
Christoph

 

[Holger Barske]

The chokes won't be on the pcb. There will be screw terminals for connecting them.