Snubber Calculator - diyAudio
Go Back   Home > Forums > Design & Build > Software Tools

Software Tools SPICE, PCB CAD, speaker design and measurement software, calculators

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 31st March 2013, 01:49 PM   #1
diyAudio Member
 
Join Date: May 2008
Location: West Yorkshire
Default Snubber Calculator

After reading Jim Hagerman's paper, "Calculating Optimum Snubbers" and working my way through the formulae several times, I figured it would be easier to put it all on a spreadsheet rather than getting the calculator out every time! I haven't been able to find anything suitable on the web so I put this together.

I've checked it with his figures and it looks accurate but perhaps someone with a more mathematical brain than me could confirm the accuracy. Also, I did the spreadsheet originally in Libre Office .ods format so the conversion to .xlsx is OK but isn't protected and the layout is slightly off. Not a major problem but feel free to tinker with it and format it properly for Windows.

Attached are links to the spreadsheets, the original article plus an alternative method of calculating resonant frequency.

Hope you find these useful and any constructive feedback is welcome.

http://dl.dropbox.com/u/109520947/SnubberCalc.ods

http://dl.dropbox.com/u/109520947/SnubberCalc.xlsx

http://www.hagtech.com/pdf/snubber.pdf

http://www.syscompdesign.com/AppNote...ar-pickups.pdf


Above calculators now updated to include drop down lists to enable data to be entered in different units. Also, .xls file added below for older versions of Excel.

http://dl.dropbox.com/u/109520947/SnubberCalc.xls

Last edited by valve5425; 7th April 2013 at 07:41 PM. Reason: Revisons made and additional file added. April 7th 2013.
  Reply With Quote
Old 31st March 2013, 03:21 PM   #2
xstreme is offline xstreme  Europe
diyAudio Member
 
xstreme's Avatar
 
Join Date: Sep 2010
Location: Italy
So at first sight appears to be sufficient...
__________________
My Audio Freeware Apps : LINK
  Reply With Quote
Old 31st March 2013, 06:09 PM   #3
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Thanks very much for doing this! As xstreme says, it seems right at first glance. Will need to double check. Nice work on the spreadsheet and the formulas.

I was having fun modifying the XLS version to allow input directly in mH, pF and KHz, with the results in ohms, F and pF for my own ease of use. All was going well until I tried to get the interwinding C to display in nF. Ooops, something went pair shaped. Will try again.
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 31st March 2013, 07:32 PM   #4
diyAudio Member
 
Join Date: May 2008
Location: West Yorkshire
Quote:
Originally Posted by Pano View Post
Thanks very much for doing this! As xstreme says, it seems right at first glance. Will need to double check. Nice work on the spreadsheet and the formulas.

I was having fun modifying the XLS version to allow input directly in mH, pF and KHz, with the results in ohms, F and pF for my own ease of use. All was going well until I tried to get the interwinding C to display in nF. Ooops, something went pair shaped. Will try again.
Glad it's of use. You should be able to enter values in scientific notation so 25nf would be 25e-08 Farads, 25pf would be 25e-011 Farads, etc.

Use something like this;

Electronics 2000 | Capacitance Unit Converter

Might make things easier and you could also cut and paste the result from the spreadsheet into the capacitance calculator.
  Reply With Quote
Old 31st March 2013, 07:53 PM   #5
diyAudio Member
 
Join Date: May 2008
Location: West Yorkshire
Just had a thought!! If I get the time I'll look at trying to incorporate a converter into the spreadsheet. Even better would be to make it possible to enter any value, but that would take a bit more working out.
  Reply With Quote
Old 31st March 2013, 08:04 PM   #6
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
It's not hard to do. I had it working well until I tried to fix the last cell. I'll post what I have, when I fix my mistake.
  Reply With Quote
Old 31st March 2013, 08:18 PM   #7
Bill_P is offline Bill_P  United States
diyAudio Member
 
Join Date: Sep 2009
Location: New York, the vampire state
I believe there is an error in the Rs power calculation. The secondary RMS voltage term should be squared in the formula.
  Reply With Quote
Old 31st March 2013, 08:19 PM   #8
diyAudio Member
 
Join Date: May 2008
Location: West Yorkshire
Quote:
Originally Posted by Pano View Post
It's not hard to do. I had it working well until I tried to fix the last cell. I'll post what I have, when I fix my mistake.
Nice one! It's a bit late in the day here to be doing complicated stuff.
  Reply With Quote
Old 31st March 2013, 08:21 PM   #9
diyAudio Member
 
Join Date: May 2008
Location: West Yorkshire
Quote:
Originally Posted by Bill_P View Post
I believe there is an error in the Rs power calculation. The secondary RMS voltage term should be squared in the formula.
Thanks for that. I'll check it out tomorrow.
  Reply With Quote
Old 1st April 2013, 03:09 AM   #10
xstreme is offline xstreme  Europe
diyAudio Member
 
xstreme's Avatar
 
Join Date: Sep 2010
Location: Italy
Quote:
Originally Posted by valve5425 View Post
Glad it's of use. .
has nothing to do but it is interesting


eEngineer - Electrical Engineering, EMI/EMC, RFI

__________________
My Audio Freeware Apps : LINK
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Snubber caps atmars Tubes / Valves 2 15th November 2008 01:10 PM
snubber p.s. wicho Chip Amps 11 21st October 2008 01:07 PM
Snubber pics? Dominick22 Chip Amps 20 7th May 2006 07:47 PM
Snubber AND non-snubber ? jimbo1968 Chip Amps 10 6th December 2005 07:49 AM
Snubber s2kov Tubes / Valves 13 30th November 2004 02:09 PM


New To Site? Need Help?

All times are GMT. The time now is 02:15 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