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 13th January 2013, 08:17 PM   #9021
zeeuw is offline zeeuw  Netherlands
diyAudio Member
 
Join Date: Mar 2010
Before a tube with ecc83 for phone
Cart is a Benz Ebony H, in a Consonance arm on a chinese turntable
For the rest DIY, class T amplifier to broadband 1way speaker on panel
Sounds great, very live and direct
  Reply With Quote
Old 13th January 2013, 08:32 PM   #9022
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
FR speaker on panel is beloved in the Orient. Are you located in Asia by any chance?
  Reply With Quote
Old 13th January 2013, 08:36 PM   #9023
zeeuw is offline zeeuw  Netherlands
diyAudio Member
 
Join Date: Mar 2010
Noo, I'm Dutch
Using a Philips Ad 12202 with a Peerless sub
U'r phono is great,specialy with shunt
  Reply With Quote
Old 13th January 2013, 08:38 PM   #9024
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Very nice then, glad you like it. Enjoy.
  Reply With Quote
Old 13th January 2013, 09:53 PM   #9025
buzzforb is offline buzzforb  United States
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Salas,
tested my sk117gr jfets with 9V and 1kR in the drain and they came in much higer thatn expected. In the 7mA range. I am wondering if it is a function of low Vds. Are these usable by dropping the 6.8K resistor or exchanging for lower value? Calculator suggest that 2.2K can be substituted and I should be OK. I figured 70mA load current since I will be running both channels of one shunt. Just want to make sure before firing up.
__________________
...Shape the sound , Man!

Last edited by buzzforb; 13th January 2013 at 09:55 PM.
  Reply With Quote
Old 14th January 2013, 04:58 AM   #9026
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
They should be 6.5mA max by Toshiba data. Use 10R for drain resistor Vdrop IDSS evaluation. If they are genuine and really in the higher GR range tier then you can fix that see text area series resistor to the trimmer accordingly.
  Reply With Quote
Old 14th January 2013, 09:13 AM   #9027
buzzforb is offline buzzforb  United States
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Ok.thanks.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 19th January 2013, 12:45 AM   #9028
buzzforb is offline buzzforb  United States
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Didn't really mess with this at all since breaking leg of one 9530 in the SSLV1.1. Ordered some more but did not get here. Went ahead and finished the Salas reg. Current setting resistos is parallel 120 and 15, for 13.3R. Shunt current of around 250mA. Probablly low for 2 channels, but don't really want to push sinks any more. Got 36V across output, loaded with 960R. Will trim to boards when attached. Tomorrow. I am tired and have to work tommorrow morning in the cold. Bla! The "plan" is to listen tomorrow or Sunday.

FYI,
This is the folded version I am building.
Simplistic NJFET RIAA
__________________
...Shape the sound , Man!

Last edited by buzzforb; 19th January 2013 at 12:49 AM.
  Reply With Quote
Old 19th January 2013, 07:12 AM   #9029
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Its not low, just not too hot-rod. Two channels like you linked will suck only 70mA out of a single supply.
  Reply With Quote
Old 19th January 2013, 09:23 AM   #9030
buzzforb is offline buzzforb  United States
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Salas View Post
Its not low, just not too hot-rod. Two channels like you linked will suck only 70mA out of a single supply.
Yeah, thats what i was getting at. I liked DCB1 with it HOT!
__________________
...Shape the sound , Man!
  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 03:45 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki