Simplistic NJFET RIAA

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RCruz

RCruz

Member
Joined 2006
Paid Member
Very good looking boards NPower... did you etch them yourself ?

With the 56dB you must be very carefull about the TX positioning..... best would be to enclose the TX, rectifiers and smoothers in a shielded box.

Where did you get the silver micas ?

What are those green caps you are using ?

Ricardo
 
NPower

NPower

Member
Joined 2007
merlin el mago said:
How performs Cout - Obbligato Cu 3.3uF?

If you can afford better two regs & two psu, one for each channel.
Click to expand...

RCruz said:
Very good looking boards NPower... did you etch them yourself ?

With the 56dB you must be very carefull about the TX positioning..... best would be to enclose the TX, rectifiers and smoothers in a shielded box.

Where did you get the silver micas ?

What are those green caps you are using ?

Ricardo
Click to expand...

Merlin

I don't know how to explain this to, six months ago I started building my first draft of audio, 300b SE Aikido, and during a conversation with my friends they challenged me to build a phono stage for a mutual friend (kind of expert). After some reading I decided to build this, therefore I have no references, only my DAC ( Valab with custom build cables ), my amp (Yamaha) speakers (AE109SE with QED cables). This is far away better than my DAC ( except noise). I don't like to use words like stage, deep, etc, etc ,etc. It's music, it's velvet and I want to dance, so it's good, it's very good ( and I think that I have good ears):D
If you look close to the picture you can see a dual shunt PSU with a common rectifier ( fast recovery hexfred's with 3 // 4700hF cap's)

Boa noite Ricardo

Thanks by your kind words.
Yes I etch them by myself ( got some problems with Positive 20 but for now is ok).
For the enclosure I'm thinking in a different approach ( sorry, right now top secret)
Lemco silver micas from here:
0.047UF 200V DC Lemco Silver Mica Capacitors - eBay (item 360166226282 end time Jul-24-10 03:55:10 PDT)
0.016UF 200V DC Lemco Silver Mica Capacitors - eBay (item 360166226156 end time Jul-24-10 03:53:47 PDT)
Green caps brand Lelon RGA series ( I think from Taiwan)
 
NPower

NPower

Member
Joined 2007
massimo said:
Colud be Salas.....
A further test could be to isolate one Shunt Reg (removing CCS Rset + the first led of the array) and listen to one ch. only. Or connect the 2nd Riaa board to the same Shunt Reg if it can deliver the extra current.
Click to expand...

Salas said:
I would solve my noise problems in a cheap box first. The gain you got can give -110dB ref 1V 0dB in its worse lows region if executed properly. You don't listen to its full now with some noise, only a portion.
Click to expand...

Hello guys

For test purposes I get one DVD player box, so everything will go inside ( except trafo), after that, Massimo advise to see if I can make them quiet.
I will post later :)
 
Salas

Salas

diyAudio Chief Moderator
Joined 2002
Paid Member
Sure.
 

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