Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Simplistic NJFET RIAA
Simplistic NJFET RIAA
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st February 2010, 12:26 PM   #3051
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Simplistic NJFET RIAA
As I always needed small low radiation TX, my experience is based only in toroids.

I will keep it in mind for future projects
  Reply With Quote
Old 4th February 2010, 11:11 AM   #3052
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by Salas View Post
Mine is Mission 774 (ULM class) and I measured 8.5 Hz Fs with the test disc for the combo. Weird cart.
How did you measured the Fs?
  Reply With Quote
Old 4th February 2010, 11:27 AM   #3053
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Test disc, low resonance sweep track, phono out to FFT.
  Reply With Quote
Old 4th February 2010, 07:52 PM   #3054
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Simplistic NJFET RIAA
Two shunts are definitively worth.
Even with only one tx and one rectifying bridge followed by two smoothers the difference for 1 shunt is producing much better separation between channels... The image grows laterally and the instruments are better focused.

Care must be taken with GND. To avoid hum at maximum, star earth linked to mains earth and case is connected to both shunts (-).

Do not connect the rectifier bridge directly to GND as this intruduces more hum.

Ricardo
  Reply With Quote
Old 5th February 2010, 08:35 AM   #3055
Joao@AltheaMusica is offline Joao@AltheaMusica  Switzerland
diyAudio Member
 
Join Date: Aug 2009
Ricardo

I'd recommend a shunt for each stage... and for grounding, use star ground to the negative rail of each shunt.

Um bom fim-de-semana
Joao
  Reply With Quote
Old 16th February 2010, 10:50 AM   #3056
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Can I use these leds?

Digi-Key - 511-1206-1-ND (Manufacturer - SLI-325YCT31W)
  Reply With Quote
Old 16th February 2010, 10:52 AM   #3057
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Yes, electrically they are OK.
  Reply With Quote
Old 16th February 2010, 07:01 PM   #3058
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Simplistic NJFET RIAA
Quote:
Originally Posted by Joao@AltheaMusica View Post
I'd recommend a shunt for each stage... and for grounding, use star ground to the negative rail of each shunt.
Hi Joćo

You are correct... I had trouble earthing the (-) of the rectifier bridge and opted to use floating earth... (it works in this case) but after some studying I decided to ground the (-) of both shunts and that produced the best results.

Did you build one of these ?

Ricardo
  Reply With Quote
Old 17th February 2010, 08:39 AM   #3059
Joao@AltheaMusica is offline Joao@AltheaMusica  Switzerland
diyAudio Member
 
Join Date: Aug 2009
Quote:
Originally Posted by RCruz View Post
Hi Joćo

You are correct... I had trouble earthing the (-) of the rectifier bridge and opted to use floating earth... (it works in this case) but after some studying I decided to ground the (-) of both shunts and that produced the best results.

Did you build one of these ?

Ricardo
No I didn`t build one yet. My expericence is from my tube amps and as well what my old professors - one of them was a designer of high frequency amps & tuners - told me from the experience of her works.

I've got my transistors and will nuild a version from Salas phono amp with a 600 ohm LCR-RIAA. It will be interesting because I'm building up my new tube phono stage with LCR-RIAA as well!
  Reply With Quote
Old 17th February 2010, 11:55 AM   #3060
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Simplistic NJFET RIAA
Lcr riaa ?
  Reply With Quote

Reply


Simplistic NJFET RIAAHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 09:02 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki