LM334z - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 April 2008, 01:58 PM   #1
StoneT is offline StoneT  United Kingdom
diyAudio Member
 
Join Date: Jan 2007
Location: Devon UK
Lightbulb LM334z

Here's a spreadsheet that some people may find helpful. It calculates the resistors required to set the current of an LM334 CCS with and without the temperature compensating diode. I did this to avoid using the bizzarely complicated and backwards way the literature sets out
Notes:
Change the .txt extension to .xls and open with Excel. It's the only way i could attach it (Why can we not post .xls files?)
Set required current in the blue box (B3) to use
It is only of reasonable accuracy for currents of 1 mA to 10 mA. this is due to the approximation of the n ratio (Iset to Ibias).
Vf of the diode has been defaulted to 0.6V. You can normally improve on the accuracy of this from the diode's datasheets, looking at the Vf/If charts.
Diode thermal coeficient of Vf has been assumed as 2mV/K.

If anyone has any suggestions they would be most welcome.
I also have a sheet that gives you Iset for given values of R1 and R2 which may be helpful to tell how well standard values fit.

Attached Files
File Type: txt lm334z.txt (17.0 KB, 65 views)
__________________
StoneT
  Reply With Quote
Old 25th April 2008, 02:39 PM   #2
StoneT is offline StoneT  United Kingdom
diyAudio Member
 
Join Date: Jan 2007
Location: Devon UK
Oops, minor correction.
and you can now enter the diodes tempco.

Again, change .txt for.xls
Attached Files
File Type: txt lm334zv2.txt (17.0 KB, 40 views)
__________________
StoneT
  Reply With Quote
Old 25th April 2008, 02:45 PM   #3
StoneT is offline StoneT  United Kingdom
diyAudio Member
 
Join Date: Jan 2007
Location: Devon UK
I should also have said that this is experimental and has not been put to the test. If you use it and it's wrong don't blame me.
If you do have info to compare it with please tell me if it's right or wrong.

THX
__________________
StoneT
  Reply With Quote
Old 28th April 2008, 02:26 PM   #4
StoneT is offline StoneT  United Kingdom
diyAudio Member
 
Join Date: Jan 2007
Location: Devon UK
Final Version!

Added the other tables so you can experiment with reisistor values. These also give you the resulting TempCo for the CCS.
As before change .txt for .xls for it to work.

All feedback appreciated.
Attached Files
File Type: txt lm334zv3.txt (22.5 KB, 20 views)
__________________
StoneT
  Reply With Quote
Old 28th April 2008, 03:12 PM   #5
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default Re: LM334z

Quote:
Originally posted by StoneT

Change the .txt extension to .xls and open with Excel. It's the only way i could attach it (Why can we not post .xls files?)
Probably becuz some XLS files contain macros.

(Back in the early days of Excel (pre-Windows) I used macros to develop a bond pricing system -- I had to do this as the traders I worked could either used a Monroe Bond Calculator or their fingers to determine yields.) You can put some nasty stuff in an Excel Macro.
  Reply With Quote
Old 28th April 2008, 03:35 PM   #6
StoneT is offline StoneT  United Kingdom
diyAudio Member
 
Join Date: Jan 2007
Location: Devon UK
:thinks: Oh no! He's close to discovering my evil plot to gain control of audiophile computers...

But seriously, am I not supposed to post these incognito files then?
__________________
StoneT
  Reply With Quote
Old 29th April 2008, 02:24 PM   #7
StoneT is offline StoneT  United Kingdom
diyAudio Member
 
Join Date: Jan 2007
Location: Devon UK
OK, realy last one this time. Locked some of the wrong cells on ver. 3 so, not hearing any opposition, Here is LM334zV4.XLS
(I just noticed we can post .zip files too, which kind of means you can post anything )
Attached Files
File Type: zip lm334zv4.zip (5.4 KB, 46 views)
__________________
StoneT
  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



New To Site? Need Help?

All times are GMT. The time now is 05:42 PM.


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