Simplistic NJFET RIAA

[Salas]

As a whole different scheme that would have to be revised too. But we have no practical problem with that ground schematic yet. Make it first.

 

[RCruz]

Ok Thanks

 

[merlin el mago]

Good news: today arrived the 8 caps 0,1uF/600V russians teflon T-3, wow are terribly bigs comparing with the 0,1uF/200V russians teflon T-2.

An externally hosted image should be here but it was not working when we last tested it.

Now only need to measure all caps & I will start mine Simplistic:=)

 

[RCruz]

FT-3 are the best of the lot.... They have an enormous linearity over the entire spectrum.

I am populating my boards now... hope to hear something in the weekend

 

[merlin el mago]

Only for fun, pic with measured FT-3

An externally hosted image should be here but it was not working when we last tested it.

 

[merlin el mago]

Ricardo, if you can hear this week-end let me know how sounds?

Muitos cumprimentos
Felipe

 

[hotiron]

Hi guys,After having recently revived my 30 year old Logic DM101 I've been scanning this thread for a few days now, only got to page 230 and decided to take action, as I had most of the parts collecting dust.
Unfortunately I don't have enough K170s or the Mosfets for the shunt so I'll need to improvise to get this baby playin tunes.
No exotic caps or Rs yet as I need to test the water first so to speak before layin oot the dosh!
Anyway this is what I came up with.
Hi Ricardo Great work Hows it going? You got a scope yet?

 

[Salas]

Looks orderly. Is it the MC version? What TO-220 transistors you got in your inventory, what other JFETS? Maybe we can think of a shunt with the parts you got. The supply is a big part of its sound.

 

[RCruz]

No scope yet

The boards look good !

 

[Salas]

Looking good indeed. Always rub clean those tarred (silver plated?) FT-3 ends before assembly by the way.

 

[RCruz]

I did rub clean but only the holes where i soldered the wires....

I will try and clean it further.

 

[Salas]

Its enough then. The joint must be clean, that counts.

 

[RCruz]

After all the past troubles, I am very carefull about solder joints

I finished building the two boards ! The psu is working very well.

Before I connect anything I must be sure there are no errors in the p2p.... It will take some time to compare the boards links with the schematic.

Tomorrow I will get the missing "tuning" caps.... finally I will work on the gnd and power connections.

 

[Marinos]

Hi Ricardo,
Could you please post a photo of board underneath. I'm trying to figure out how to secure those Mica monsters (I have 2 of them for both RIAA values... ).

 

[RCruz]

Desolder the metal ring legs from under the caps, make suitable holes in the board, glue the caps in place and then solder them.

 

[Marinos]

Since I'm using teflon sheets for my constructions I could heavily modify them converting them to Teflon and air dielectric ...

A good glue for teflon anyone ?

 

[AndrewT]

Since I'm using teflon sheets for my constructions I could heavily modify them converting them to Teflon and air dielectric ...

A good glue for teflon anyone ?

a ty-wrap.

 

[RCruz]

Hi Marinos

Where did you get the teflon sheets from ?

What do these look like ?

 

[Marinos]

Hi Andrew,
I don't know about the system but I appreciate your generosity..

Hi Ricardo,

Read this page http://www.diyaudio.com/forums/power-supplies/143693-simplistic-salas-low-voltage-shunt-regulator-61.html#post1860076

 

[merlin el mago]

No scope yet

The boards look good !

Nice work Ricardo

Very good components selection:
Resistors: 1 shinkoh, 1 Takman & the rest Kiwame?
Elec. Caps: BG NP, Elna Silmic II, Rubycon ZL?
Film Caps: Obbligato, Russian Silver Mica, Russian FT-3 teflon
What about how's sound?

Teflon board by Erno's Borbely:

An externally hosted image should be here but it was not working when we last tested it.