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31st March 2013, 01:49 PM  #1 
diyAudio Member

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...arpickups.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. 
31st March 2013, 06:09 PM  #3 
diyAudio Moderator

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, µF 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.
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31st March 2013, 07:32 PM  #4  
diyAudio Member

Quote:
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. 

31st March 2013, 07:53 PM  #5 
diyAudio Member

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.

31st March 2013, 08:18 PM  #7 
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.

31st March 2013, 08:19 PM  #8 
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31st March 2013, 08:21 PM  #9 
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1st April 2013, 03:09 AM  #10 
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Join Date: Sep 2010
Location: Italy

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