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
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
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)😀
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)
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.
NPower, yes sorry I don't see the dual reg. but I insist if you can afford will be better dual PS & dual Tx for top performance.
Don't forget Salas advice to box the phono to avoid hum.
Don't forget Salas advice to box the phono to avoid hum.
Watch the pic: 4 mosfet, two of them clamped to small heatsinks and thus partially hidden, double led arrays, double set of caps, etc.
Follow the wiring: two set of cables going to the Riaa boards coming out from different point of the PS pcb......
massimo, 1st time a didn't see, 2nd time I saw the dual reg (but don't see dual PSU), now you show me the dual PSU so only needs dual TX.
No, not only a second Xfrm, but one more bridge and a new set of filter caps. NPower's board has a dual Shunt Reg, but they are both sharing the same raw PS (bridge&caps). He clearly explained this arrangement in post #4162
And somewhere they must be mixing something ground with filter caps return currents quite possibly.
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.
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.
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 🙂
I think that already saw this
Salas
Saw this one on eBay, any comments ?
BHL Audio JFET Phono Preamplifier kit - 2sk170 RIAA - eBay (item 230498727963 end time Aug-12-10 11:25:01 PDT)
Brgds
Salas
Saw this one on eBay, any comments ?
BHL Audio JFET Phono Preamplifier kit - 2sk170 RIAA - eBay (item 230498727963 end time Aug-12-10 11:25:01 PDT)
Brgds
That phono is based around Le Pacific circuit. Salas further improved it. No comparison at all.
P.S. the author stated: This is not a DIY copy of a commercial product
and moreover: use a mid-grade switch mode wall wart power supply for this because they are cheap, easy, and very quiet
No comment! 😱
Salas
can I use your schematic with Ortofon VMS20 Ortofon VMS 20 Owners Manual, Service Manual, Schematics, Free Download | Vinyl Engine
can I use your schematic with Ortofon VMS20 Ortofon VMS 20 Owners Manual, Service Manual, Schematics, Free Download | Vinyl Engine
