Hi Nick, did you get a chance to try that circuit?. It looks simple enough for me to try p2p build but i would have no idea if it is would be an improvement over CRCRC.
Quan
Tonight or tomorrow. But you could try yourself independently also, since there are subjective things to consider about the rail impedance changing too beyond surely more DC power line isolation. Me I haven't got any filter whatsoever already installed passive or active to compare anyway. So it will be just raw vs one BJT Cmult 2nd order based. Two of those, one for each channel's DCin of course. All capacitors >=50V.
Attachments
Whatever you already got vs adding the KM should suffice for you to decide if its an improvement on all fronts or you wanna revert. So you know against alternative passive cell too.
Just rearranged my GND connections (according to the pdf) and finally got totally hum free results.
I had so much trouble in the past dealing with hum from gnd arrangements and finally determined a basic connection that works very well. Yours is somehow different so I worried. Now I know it works perfectly.... 🙂
I am always learning.
I am always learning.
I had taken the trouble to totally plan, guide, and supervise the layout (poor CRT I tortured him doing the CAD work) and to test build boxed assemblies in fully wired stereo scheme during last August so to ensure whatever I will suggest in the guide ain't wishful thinking. Grounding, oscillation, temperature, adjust, sound check. Tea bag Mike helped with feedback as self-volunteer "clueless" proto builder also. So to verify execution difficulty level is sensibly friendly as well.
Its the only way to make a sensitive thing like a no feedback loop discrete phono stage that can do MC predictable for a wide range of builders skills. I thought the parts selection and any PSU extravagance should be the builders creativity area but on firm ground. I hope that kind of approach worked well enough in the end.😉
Sorry for my blond question... I am getting a bit lost.
In case of a MM RIAA, do I also need a 2x36VAC trafo?
My point is, I have in stock a 2x24VAC 225VA and I was wondering if I could use it.
In case of a MM RIAA, do I also need a 2x36VAC trafo?
My point is, I have in stock a 2x24VAC 225VA and I was wondering if I could use it.
Unfortunately in your case the bias values and setting procedure in all PCB FSP gain versions is designed around a prerequisite of more than 30V regulated DC rail, thus more than 40V raw DC rail. i.e. 24VAC falls short for that.
Hello,
I intend tu assembly the Salas Simplistic NJFET RIAA. My turntable is Thorens TD 160 BC Super and the tonearm is SME 3009 Improoved (fixed headshell).
I'm interested to learn your advice about cartridges that would be appropriate for my hardware and, eventually, adaptations of the actual Simplistic NJFET RIAA diagram, please.
Thank you, very much.
I intend tu assembly the Salas Simplistic NJFET RIAA. My turntable is Thorens TD 160 BC Super and the tonearm is SME 3009 Improoved (fixed headshell).
I'm interested to learn your advice about cartridges that would be appropriate for my hardware and, eventually, adaptations of the actual Simplistic NJFET RIAA diagram, please.
Thank you, very much.
KM pre-reg
Hi Nick , quick try with KM as pre-reg for FSP . Psychoacoustics effect but i do detect less noise with it in place and more enjoyable. I don't have 1000uf 50V thus use 680uF in C1 filter, C2 -cheap 470uf and output couple cap is 47uf/63V. Can i sub the output cap for 22uf film cap?
Quan
Hi Nick , quick try with KM as pre-reg for FSP . Psychoacoustics effect but i do detect less noise with it in place and more enjoyable. I don't have 1000uf 50V thus use 680uF in C1 filter, C2 -cheap 470uf and output couple cap is 47uf/63V. Can i sub the output cap for 22uf film cap?
Quan
If you mean the one with single BD139 and three capacitors I posted, its not a KM, just a second order normal capacitance multiplier filter. What is the practical voltage drop across it? About 1.5V? Here is its theoretical PSRR with your now capacitor values. 22uF Cout does not spoil it enough. Should clean some rail incoming EMI noises better, why not. Are bass and dynamics still good?
