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 Yesterday, 05:18 PM   #18051
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Quote:
Originally Posted by SRMcGee View Post
What would you suggest be checked next?

Many thanks,
Scott
Voltage across Q6 & Q5 (drain to source each) on both channels
  Reply With Quote
Old Yesterday, 06:16 PM   #18052
SRMcGee is offline SRMcGee  United States
diyAudio Member
 
SRMcGee's Avatar
 
Join Date: May 2004
Location: Wynnewood, PA
Simplistic NJFET RIAA
Salas:

Q5: 7.33v R, 7.40v L
Q6: 12.82v R, 12.87v L

Regards,
Scott
__________________
Good decisions come from experience. Experience comes from making bad decisions. (Mark Twain)
also, Everyone has a plan, till they get punched in the mouth. (Mike Tyson)
  Reply With Quote
Old Yesterday, 06:53 PM   #18053
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Not suspicious readings. Some RCA terminal discontinuity possible? Buzz them to board connections with the DMM? C3 C4 discontinuity possible? Try other any quality C3 C4 or swaps between channels to see what happens?
  Reply With Quote
Old Yesterday, 09:47 PM   #18054
SRMcGee is offline SRMcGee  United States
diyAudio Member
 
SRMcGee's Avatar
 
Join Date: May 2004
Location: Wynnewood, PA
Simplistic NJFET RIAA
Salas:

I expect the problem is something incredibly simple but I am oblivious to it. The input and output RCAs have been tested, C3 and C4 check out just fine and I've reflowed all of the relevant solder points, all to no effect. I cannot find a point in the right channel that is inconsistent with the left channel.

I'll take a couple of days away from this problem and try again after the weekend, hopefully with refreshed eyes.

WTF?

Regards,
Scott
__________________
Good decisions come from experience. Experience comes from making bad decisions. (Mark Twain)
also, Everyone has a plan, till they get punched in the mouth. (Mike Tyson)
  Reply With Quote
Old Yesterday, 10:02 PM   #18055
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
It normally takes a generator and a scope. To feed it sinewave signal and probe the circuit's path until spotting where it stops.
  Reply With Quote
Old Yesterday, 10:13 PM   #18056
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Quote:
Originally Posted by SRMcGee View Post
I expect the problem is something incredibly simple but I am oblivious to it.
Using same color signal wires and accidentally swapped hot for cold at some spot could be such a trap for instance
 

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 01:07 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki