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 16th May 2011, 06:59 PM   #6241
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
So I put a jumper instead R9 & disconnect C5?
  Reply With Quote
Old 16th May 2011, 07:01 PM   #6242
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
  Reply With Quote
Old 16th May 2011, 07:05 PM   #6243
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Only for your information I don't use C10, ok I will do the changes & rapport, thank you Nick.
  Reply With Quote
Old 16th May 2011, 07:41 PM   #6244
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Simplistic NJFET RIAA
Hi Merlin

What is the value of the 47nF cap you are using ?
  Reply With Quote
Old 16th May 2011, 07:51 PM   #6245
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Before 47.1nF, now 47.0nF both channels
  Reply With Quote
Old 16th May 2011, 08:00 PM   #6246
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Simplistic NJFET RIAA
As you use (6k8r // 1M) = 6754r

6754 x .047 = 317.44 almost = 318, I would say you are spot on the 500.5Hz mid point.

It should sound very good as is.

Let us know your oppinion if you reduce the 15,2n to 15n
  Reply With Quote
Old 16th May 2011, 09:49 PM   #6247
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
First I will try Nick advice, if it's not enough I will try the 15nF & tell you Ricardo.
  Reply With Quote
Old 17th May 2011, 02:38 PM   #6248
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
After jump R9 & take off C5 I measured again the voltages:

Left channel
Leds to gnd 7.30V
Across R17 0.259V
R10/Q2 to gnd 10.30V
R1/Q3 to gnd 11.32V
R7 to gnd 10.51V
Drain Q5 to gnd 19.85V

Right channel
Leds to gnd 7.50V
Across R17 0.285V
R10/Q2 to gnd 11.24V
R1/Q3 to gnd 11.80V
R7 to gnd 11.30V
Drain Q5 to gnd 18.80V

It's necessary to adjust R10/Q2 to gnd at 10.0V with R6 trimmer & do the measurements again?
  Reply With Quote
Old 17th May 2011, 02:43 PM   #6249
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Better match channels there with R6 trimmer, yes. Also in right channel I see a bit high through R7. Its because voltage Q2 is high, but make your R7s 1.2k if you have.
  Reply With Quote
Old 17th May 2011, 02:50 PM   #6250
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
I have 1K21?
  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 05:14 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