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.

Jfet BOZ
Jfet BOZ
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 25th January 2018, 04:04 PM   #1421
marconi118 is offline marconi118  Germany
diyAudio Member
 
Join Date: Mar 2008
I will follow juma bs170 loaded with bs170 based gyrator
  Reply With Quote
Old 25th January 2018, 05:08 PM   #1422
indra1 is offline indra1  Indonesia
diyAudio Member
 
Join Date: Nov 2010
Location: Bogor
Wise choice for your initial step.
  Reply With Quote
Old 31st May 2018, 04:02 PM   #1423
citationfan is offline citationfan
diyAudio Member
 
Join Date: Oct 2013
Is it possible to take K246 instead of k170?
I have two oldstock to hand.
  Reply With Quote
Old 31st May 2018, 06:34 PM   #1424
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Jfet BOZ
for easy load , just go for it
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 15th October 2018, 12:23 AM   #1425
maouna is offline maouna  Greece
diyAudio Member
 
Join Date: Oct 2008
Hello Juma.I built Jboz with J310. I am using 24V Power supply. one channel draws 10mA with 16.34V at the drain and the other 9.5mA with 16.76V at the drain.Are the drain voltages correct or should they be half the supply voltage ?

I also found a small series shunt PSU you posted on an other forum.Is there a any updated version of it or is it final?I would like to build it.
Attached Images
File Type: png jboz j310 + cap_mult-sch-1.png (1.9 KB, 328 views)
File Type: jpg IMG_20181015_015036.jpg (841.0 KB, 331 views)
File Type: gif post-65-0-65304300-1329930215.gif (6.6 KB, 336 views)
  Reply With Quote
Old 15th October 2018, 08:35 AM   #1426
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Quote:
Originally Posted by maouna View Post
Hello Juma.I built Jboz with J310. I am using 24V Power supply. one channel draws 10mA with 16.34V at the drain and the other 9.5mA with 16.76V at the drain.Are the drain voltages correct or should they be half the supply voltage ?
12-14V is the target, but J310 have their Idss in wide range so you should use 1k or so for R3. That will give a bit more gain and higher Zout (mainly determined by value of R3) - or you can lower R5 (to increase the Id) but that will increase Pd in J310 (up to 200mW without the heatsink is OK). I would go for Id of about 15mA at Vds of 12V.

Test and find the compromise that suits your JFETs and ears.

If you have DC offset at the input (gate leakage ) lower the R2.

Quote:
Originally Posted by maouna View Post
I also found a small series shunt PSU you posted on an other forum.Is there a any updated version of it or is it final?I would like to build it.
It works all right, just take care that Vout depends on R2/R3 (R10/R12) ratio - see TL431 datasheet.
__________________
Please don't use private messages for question related to audio projects. It defeats the purpose of the forum.
  Reply With Quote
Old 24th October 2018, 09:59 AM   #1427
marconi118 is offline marconi118  Germany
diyAudio Member
 
Join Date: Mar 2008
how would perform a j111 instead j310 in JFET BOZ?

It seems to me thet J111 could have a bit more Yfs?
  Reply With Quote
Old 30th November 2018, 09:51 PM   #1428
marconi118 is offline marconi118  Germany
diyAudio Member
 
Join Date: Mar 2008
what about bf862 for the jfet BOZ?
  Reply With Quote

Reply


Jfet BOZHide 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
JFet BOZ Tyimo Pass Labs 14 30th April 2006 04:18 PM
Can I replace BF245C JFET with J201 JFET? bigmike216 Parts 2 7th December 2005 07:50 AM
How to use Jfet? lumanauw Pass Labs 5 7th April 2005 04:12 AM


New To Site? Need Help?

All times are GMT. The time now is 12:19 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki