Tek SG505 Opt2 (Bal) schematics? - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

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 18th June 2011, 08:55 PM   #1
diyAudio Member
 
Zero Cool's Avatar
 
Join Date: Sep 2004
Location: MN
Default Tek SG505 Opt2 (Bal) schematics?

I am looking for schematics for the Tektronix SG505 Option2, the balanced output option.

I have schematics for the standard 505 and I am wondering how they are doing the balancing. and more specifically how the output on the rear connector is done? On the unbal 505 they use pins 25 and 26 but I'm wondering if the balanced version outputs a balanced rear output. or is in unbalanced, and if it is unbalanced is it at the same gain as the balanced output??


Zc
__________________
It's not about what you can BUY...It's about what you can BUILD!
  Reply With Quote
Old 19th June 2011, 09:12 AM   #2
diyAudio Member
 
Join Date: Dec 2007
They convert the unbalanced to balanced with an inverting stage. It outputs a balanced signal thru the 25A (+) and 26A (-). The rear balanced signal comes from two LF353, with -20db attenuation of the front signal and 600ohm output impedance (300 ohm in each rail).
  Reply With Quote
Old 20th June 2011, 04:01 AM   #3
diyAudio Member
 
dchisholm's Avatar
 
Join Date: Mar 2011
Location: St Louis, Mo
Quote:
Originally Posted by dinos8746 View Post
They convert the unbalanced to balanced with an inverting stage . . . .
Is that the same circuit used in Jim Williams' "Ultra-Pure Oscillator" (except that he created a 100 ohm balanced output, rather than 600 ohms)? See atch; taken from Fig 96 (pg 65) of Linear Technology AN67.

Dale
Attached Images
File Type: jpg Single_End2Bal.JPG (17.2 KB, 81 views)
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Precision Atten for Tek SG505 Zero Cool Equipment & Tools 3 19th June 2011 04:34 PM
Help! Looking for a Tek 2225 Service Manual or schematics?? wildswan Equipment & Tools 2 9th November 2009 12:18 PM
need schematics for zapdac mk3,bal. Alexiss Digital Line Level 5 8th March 2009 09:07 PM
SG505 puzzle jackinnj Everything Else 16 1st September 2006 02:51 PM
Bal-Unbal-Bal Cable Wiring richie00boy Everything Else 3 3rd February 2005 11:08 AM


New To Site? Need Help?

All times are GMT. The time now is 06:23 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2