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.

Bride of Zen, Bride of Son of Zen
Bride of Zen, Bride of Son of Zen
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 9th February 2018, 10:28 PM   #81
mjf is offline mjf  Austria
diyAudio Member
 
Join Date: Jan 2009
Location: Austria
attenuation at the output:
e. g. paralell a 10k res to your 10k pot - this gives you a "5k pot load" similar to the original schematic and decreases the output signal.
Attached Images
File Type: jpg boz mod2.JPG (227.8 KB, 102 views)

Last edited by mjf; 9th February 2018 at 10:31 PM.
  Reply With Quote
Old 9th February 2018, 10:58 PM   #82
darrr is offline darrr
diyAudio Member
 
Join Date: Jan 2018
Location: Poland
Good idea I must try. On your diagram is R3 100k which isn't in the original BoZ.
  Reply With Quote
Old 10th February 2018, 08:32 AM   #83
mjf is offline mjf  Austria
diyAudio Member
 
Join Date: Jan 2009
Location: Austria
r3 100k is only for sim purposes (e. g. input impedance of an amp.......)

annother option......if you build in a 820 ohm res instead the 1k drain res (or
paralell a 4,7k res to the 1k ) the gain will decrease.......(around 4 x)

Last edited by mjf; 10th February 2018 at 08:51 AM.
  Reply With Quote
Old 10th February 2018, 08:50 AM   #84
mjf is offline mjf  Austria
diyAudio Member
 
Join Date: Jan 2009
Location: Austria
.....and at last.......lower r12 (10k) to 4,7k or so..... attenuates the signal a bit.......this is a little bit crude, but it helps.
(or you try out to change r3 at the output with 4.7k .......)
Attached Images
File Type: jpg boz mod3.JPG (230.6 KB, 83 views)

Last edited by mjf; 10th February 2018 at 08:57 AM.
  Reply With Quote
Old 10th February 2018, 10:56 AM   #85
darrr is offline darrr
diyAudio Member
 
Join Date: Jan 2018
Location: Poland
I suppose that your r3 is useless in my BoZ I'll change and listen until I get to the best sound. Thank you for your help
  Reply With Quote
Old 10th February 2018, 09:27 PM   #86
darrr is offline darrr
diyAudio Member
 
Join Date: Jan 2018
Location: Poland
Something wrong with one channel. After few hours of listening music I measured bias and now it's looking like this. I cant increaese bias becouse now pot is in max position
Attached Images
File Type: jpg schema 5.JPG (11.7 KB, 66 views)
  Reply With Quote
Old 11th February 2018, 10:41 AM   #87
mjf is offline mjf  Austria
diyAudio Member
 
Join Date: Jan 2009
Location: Austria
i guess the boz was hot......
are the voltages in the normal region when the boz is cooled down?


(all transistors in the boz need a proper heatsink!)
  Reply With Quote
Old 11th February 2018, 11:10 AM   #88
darrr is offline darrr
diyAudio Member
 
Join Date: Jan 2018
Location: Poland
voltages are the same when it starts and after few minutes.(3.0 on beginning , 3,4 after few minutes) Heatsinks of course are installed. Irf on this channel is colder than the other.The same r104(1K)

Last edited by darrr; 11th February 2018 at 11:23 AM.
  Reply With Quote
Old 11th February 2018, 02:39 PM   #89
darrr is offline darrr
diyAudio Member
 
Join Date: Jan 2018
Location: Poland
I withdrew a few turns on P102 and now the measurements look like this.
Attached Images
File Type: jpg schema4.JPG (61.5 KB, 46 views)
  Reply With Quote
Old 11th February 2018, 03:58 PM   #90
mjf is offline mjf  Austria
diyAudio Member
 
Join Date: Jan 2009
Location: Austria
.......yes, the current is low.....less heat.

the boz has only a few parts to measure, so check every res (ohm) with your dmm......

is the 100uF (c102) electrolytic cap built in the right way?

if they all are correct, search for a bad soldering point/lost connection.

......and the 1uF input cap not to forget......

Last edited by mjf; 11th February 2018 at 04:04 PM.
  Reply With Quote

Reply


Bride of Zen, Bride of Son of ZenHide 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
New PCB for bride of zen maartentje Pass Labs 6 28th February 2005 08:19 AM
Bride of zen PCB maartentje Pass Labs 8 14th February 2005 02:26 AM
bjt bride of zen renjiish Pass Labs 1 24th September 2004 04:54 PM
Bride of son of zen -----> WHERE? m60gpmg Pass Labs 6 23rd September 2002 10:08 PM
Bride of Son of Zen vs. A;eph P Peter Daniel Pass Labs 0 25th January 2002 08:45 PM


New To Site? Need Help?

All times are GMT. The time now is 06:19 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