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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 20th November 2010, 12:00 PM   #5291
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by AndrewT View Post
is this an answer to post 5288?
See post 5289
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Old 20th November 2010, 02:55 PM   #5292
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by merlin el mago View Post
remember all output carts are balanced...
which is why I ask where are the MM, MC connections in your diagram.

You show unbalanced input to balanced output.
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regards Andrew T.
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Old 20th November 2010, 09:28 PM   #5293
merlin el mago is offline merlin el mago
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TT RCA + to input +
TT RCA - to input -
TT GND to gnd chassis
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Old 21st November 2010, 02:18 AM   #5294
audiotux is offline audiotux  Germany
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Hallo Felipe ,

Congrats ! and thanxs for your pioneering work .
Hope you enjoy the black gold fully .
A big , big thanxs to Salas too for this simple thingie !

Greetings
Juergen
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Old 21st November 2010, 03:11 AM   #5295
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Cheers. Did you make one by now?
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Old 21st November 2010, 01:54 PM   #5296
audiotux is offline audiotux  Germany
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Hi Salas ,

me ?
at the moment i am in preparation for the _thousend itterations_ ,
but to lazy to match the J-Fets or not in the mood for soldering .
I would like to see a PCB in the DiyAudio-Shop (not for me) but
for newbees or starters , for such people that have not soldered
anything . Maybe a good oppertunity to spread the gospel of analog
or winning the I-Pod-Generation .

Greetings
Juergen
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Old 21st November 2010, 02:48 PM   #5297
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by audiotux View Post
Hallo Felipe ,

Congrats ! and thanxs for your pioneering work .
Hope you enjoy the black gold fully .
A big , big thanxs to Salas too for this simple thingie !

Greetings
Juergen
Hi Juergen,

Thank you, without Salas & his work never do it, thanks Salas.

Cheers
Felipe
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Old 22nd November 2010, 08:15 PM   #5298
rclourenco is offline rclourenco  Portugal
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Default Salas NJFET RIAA PCB

My first knowledge of this very good design was around last summer, at the time I was not very good welcomed, and I went way, although not giving up…
I kept on reading the threads development from the “shadow”.
Last weekend, having during this time gathered all the needed material to build my own Salas RIAA, I decided I didn’t wanted to go at it with point to point boards, and decided to design some kind of a PCB board. The result is presented in the jpeg bellow, it was made with the help of PAD2PAD software, I didn’t had time to etch yet but after some analysis I believe it is correct from the electrical point of view.
I thought it to allow the use of several types of resistors, mainly 15mm spaced and Caddock (this includes 1W resistors), for the use of several types of capacitors, like Russian Teflon, Russian silver mica, Lenco, and the possibility of paralleling smaller values to get the final ones right. I had extra careful with the ground path, and will etch with double faced boards, using the top with full copper (of course isolated in all not ground connections).
Attached also is the P2P file.
Please take extra time to re-check and then use it as you please.
I will now work on the Shunt supply.
Attached Images
File Type: jpg Salas NJFET RIAA PCB.JPG (91.8 KB, 349 views)
Attached Files
File Type: zip SALAS NJFET RIAA_NOV2010-VERSĂO FINAL.zip (15.3 KB, 114 views)
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Old 24th November 2010, 09:35 PM   #5299
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by AndrewT View Post
which is why I ask where are the MM, MC connections in your diagram.

You show unbalanced input to balanced output.
TT RCA + to input +
TT RCA - to input -
TT GND to gnd input

So balanced input to balanced output.
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Old 24th November 2010, 11:21 PM   #5300
studeb is offline studeb  United States
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Andrews point, made by others as well, is that the cartridge output is balanced but not referenced to ground. To get a proper balanced output a center tapped transformer would be have to be used.

Does a Grado cart have balanced output? They are usually wood or plastic bodied so there cannot be a ground reference in them. I do not know of any moving coils with a center tapped coil. For that matter is there any cart with a known center tap or ground independant of the four output pins?
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