Simplistic NJFET RIAA

[vgeorge]

Ground their cases too.

Haven' t close the case yet. I plan to put some cooper foil around and ground it.
But I have no audible noise.
Merlin, I am tempted to try some teflon film and foil in the future. I use them in the RIAA part.

 

[Salas]

Put your finger on them while playing. If it will not hum, don't bother.

 

[vgeorge]

Well, that' s difficult, because with the top open, I get some buzz anyway. But I will ground them, just to be safe.

 

[merlin el mago]

Merlin, I am tempted to try some teflon film and foil in the future. I use them in the RIAA part.

I used them in RIAA & interstage with superb results

 

[samod]

I used them in RIAA & interstage with superb results

Search cap for RIAA!

BFC241644703 - 47n 2%
BFC241890017 - 47n 2%


FKP2-.015/63/2.5 - 15n 2.5%
FKP2-.015/100/2.5 - 15n 2.5%

MKP1837347161G 47n 1%
MKP1837315161G 15n 1%

OEMsTrade - Electronics Part Search

 

[Tea-Bag]

I have also as interstage 47nF teflon film & foil from USA

Merlin, do you know what the black stipe's are for? Input or output? I assume the later. Mark was not sure.

 

[merlin el mago]

Merlin, do you know what the black stipe's are for? Input or output? I assume the later. Mark was not sure.

I used as outer foil for interstage & I don't headr any noise when touched by hand so is a good signal that the cap seems well shielded, yes Mark was not sure because I asked him 1st time I bought him the caps.

 

[DARIO1997]

C2

Hi Salas,

for C2 is O.K. 16nf or is better 15.33nf?
My RIAA calculator indicates 15957pf.
Regards

 

[Salas]

Don't use a calculator, it does not know the circuit as a whole. Get the PDF from the link in post #1 and use each cap value recommended in the list for each sensitivity.

 

[smpkje]

my new version for Salas pre-pre + MM RIAA (63db)

 

[Salas]

my new version for Salas pre-pre + MM RIAA (63db)

Based on the PDF for pre-pre+HMC=63dB?

 

[smpkje]

Yes pre-pre + HMC

 

[Salas]

Use both C3 per channel 47nF Teflon if you can Ι would suggest.

 

[smpkje]

This is the left channel of the new Salas 63db, according the pdf of post #6190.
On oscilloscope shows beautiful.

 

[schultzsch]

looks nice

 

[Salas]

This is the left channel of the new Salas 63db, according the pdf of post #6190.
On oscilloscope shows beautiful.

You put DIP switch loading I see. Clean assembly. Still big interstage caps...

 

[smpkje]

The dip switch is for connecting mm cartridge or pre pre output. You can see on pdf.

 

[Salas]

Ah, for that. I saw 4 positions and I thought its for loading. *HMC, not real MM. Would need 100 Ohm Rs and would go 56dB total. Then it would be MC/MM. As I gave it in PDF is LMC/HMC.

 

[Salas]

P.S. Does it give you enough output on scope 1kHz over the previous?

 

[smpkje]

Yes as I can see. I’ll measure it tomorrow