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

Solid State Talk all about solid state amplification.

Lizi final
Lizi final
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 1st February 2006, 01:40 AM   #1
Leolabs is offline Leolabs  Malaysia
diyAudio Member
Leolabs's Avatar
Join Date: Dec 2004
Location: Bukit Mertajam
Send a message via MSN to Leolabs
Cool Lizi final

This is the near final version of her,but still got a few question:
-What's the usable bias current of the JFETs???
-What's the usable value of the drain resistors(Which related the bias current.)???

The JFETs maybe the 2SK246/J103 pair or the 2N545x/6x pair.
Attached Files
File Type: pdf lizi.pdf (19.1 KB, 92 views)
  Reply With Quote
Old 1st February 2006, 02:39 AM   #2
lineup is offline lineup  Sweden
diyAudio Member
lineup's Avatar
Join Date: Dec 2005
Location: the north
How much current, depends totally on which JFET you use.
There is a value in datasheet MAX Current.
I usually set the current to be less than 50% of this MAX Current.

What value of R13/R14 also depends on which JFET transistor you use.
Voltage Gate-Source to set a specific current will be different
for different JFETs.
Also will be different for each individual JFET.
This is why JFETs often are 'matched'. This means you select two JFETs with similiar VoltGS value.

After you have chosen JFETs ( finding P-JFET is the tricky bit )
and set current with R13, R14 ( N-JFET and P-JFET have different qualities !)
you select R4/R7 to set a suitable current in Q1/Q2 stage.
  Reply With Quote


Lizi finalHide 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
latest version of Lizi Leolabs Solid State 95 29th June 2008 03:01 AM
Workable Lizi final Leolabs Solid State 19 15th May 2006 02:44 AM
Another look of Lizi Leolabs Solid State 4 7th December 2005 02:49 PM

New To Site? Need Help?

All times are GMT. The time now is 07:57 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio