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

Pass Labs This forum is dedicated to Pass Labs discussion.

BLZS and SOZ problem
BLZS and SOZ problem
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
Thread Tools Search this Thread
Old 8th December 2003, 01:08 AM   #1
Adams_Leo is offline Adams_Leo  China
diyAudio Member
Join Date: Apr 2003
Location: Chengdu
Default BLZS and SOZ problem

I want to build BLZS preamp and SOZ amp.
1.My CD player no balance output and the SOZ need balance input.so I want modify the BLZS preamp.input unbalance signal but balance output.it can work well,the attach file has modified BLZS SCH.
2.if build 10W SOZ,the 8 Ohm resistance use dale 50W is OK?
Attached Images
File Type: gif blzs.gif (8.1 KB, 435 views)
  Reply With Quote
Old 8th December 2003, 04:53 AM   #2
mefinnis is offline mefinnis
diyAudio Member
mefinnis's Avatar
Join Date: Feb 2001
Location: Adelaide, Australia
The BLS article tells you that the circuit can be used as an unbalanced-to-balanced converter by simply grounding 1 of the input leads ...... so, yes, this will work.

50W Dale's will be quite sufficient at 10W.


  Reply With Quote
Old 8th December 2003, 05:55 AM   #3
jh6you is offline jh6you
Account Disabled
Join Date: Aug 2002
Location: Near to the Pacific Ocean
In addition, I recommend to replace R3/R4/R5/R6 with constant current sources (CCS), for a reliable set of symmetrical output swings. There are many guidances how to make simple CCS in this forum.
  Reply With Quote
Old 8th December 2003, 02:54 PM   #4
eLarson is offline eLarson  United States
diyAudio Member
eLarson's Avatar
Join Date: Aug 2002
Location: Gaithersburg, MD
I used the current source (sink) that NP showed in his A75 front-
end: a zener being fed by a resistor attached to the positive rail,
and filtered with an RC. This establishes a relatively stable
voltage which I used to drive the gate of an IRF510 (two,
actually: each gain MOSFET gets its own in mine.)

It works well, but in my can't-leave-well-enough-alone mania I'm
thinking of cascoding the gain devices.

Would a woodchuck bother to chuck MDF?
  Reply With Quote
Old 17th December 2003, 01:12 AM   #5
kenbeyond is offline kenbeyond  China
diyAudio Member
Join Date: Nov 2003
Location: Shenzhen, China
Send a message via MSN to kenbeyond
Default Question

Follow this circuit, unbalance input and balance output, i imitate one and test, but the +output level and -output level is difference, near 0.2V(input 0.5V), is problem? i remember Son of Zen document also same like this. (photo is + - output level addition)
Attached Images
File Type: jpg 200312122019684342.jpg (15.3 KB, 231 views)
  Reply With Quote
Old 17th December 2003, 09:40 AM   #6
wuffwaff is offline wuffwaff  Netherlands
diyAudio Member
wuffwaff's Avatar
Join Date: Aug 2001
Location: Ingolstadt Germany

this is the normal behaviour if you donīt use current sources. Since the output differential is ok I wouldnīt worry about this.

een ooievaar is geen konijn want zijn oren zijn te klein!
  Reply With Quote


BLZS and SOZ problemHide 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
AMP problem nigelwright7557 Solid State 25 26th May 2008 02:47 PM
dac problem kaldirdimgell Digital Source 11 13th December 2007 05:35 PM
WTB: BLZS kit/PCBs vsr123 Swap Meet 2 17th November 2004 04:18 PM
P3a problem Morph Solid State 9 27th February 2003 07:57 PM

New To Site? Need Help?

All times are GMT. The time now is 08:07 PM.

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