Snubber Calculator - Page 3 - diyAudio
Go Back   Home > Forums > Design & Build > Software Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 6th April 2013, 04:40 PM   #21
Bill_P is online now Bill_P  United States
diyAudio Member
Join Date: Sep 2009
Location: New York, the vampire state
Good job! Thanks for your hard work on this. The power calculation works correctly for me.
  Reply With Quote
Old 12th September 2013, 03:21 PM   #22
vita is offline vita  Italy
diyAudio Member
Join Date: Dec 2005
Location: i do not remember
Default procedure

Please, I want to know if a transformer has two secondary, two bridge (CR21 = kpbc2504, Cr17-20 = 1N4007) connected as in the picture I posted, is it need a snubber per branch, ie a total of 4 ?, because the + and -.
This transformer audible and tedious 100Hz.les measured resonance inductances are not equal, I have no oscilloscope to measure the parasitic capacitance, but if someone just tell me if the procedure is correct.
Attached Images
File Type: jpg Trx.JPG (140.3 KB, 109 views)
  Reply With Quote
Old 12th September 2013, 04:19 PM   #23
vita is offline vita  Italy
diyAudio Member
Join Date: Dec 2005
Location: i do not remember
The translation of the text above is not correct, I presents the corrected text.

please, I wanted to know for a transformer with two secondary, two bridge (CR21 = kpbc2504, Cr17-20 = 1N4007) connected as in the picture I posted, if you need a snubber by branch 4 in total, due to the + and -.
This transformer has a resonance at 100Hz.,
it is audible and annoying, if I measure the series inductance coils 31volt (I measures in pairs, with the primary shorted) the inductance is not equal, I measure with philips pm 6303 lcr, the measurements are to 1kHz ..
I read on the meter, capacitance, but only with non shorted winding, is that it is the parasitic capacitance?, or the capacitance between windings, or an oscilloscope is required for this measure.
Is that so far, the procedure sounds correct?

Thank you,
Best regards
  Reply With Quote
Old 21st October 2013, 02:43 PM   #24
diyAudio Member
Join Date: May 2008
Location: West Yorkshire
Hi Stefano.

Sorry for the delay. You could try one snubber across the AC inputs to CR21 (as close to the secondaries as possible) and another across points 36 & 36.

Treat your multiple secondaries to CR21 as one secondary, taking necessary measurements from where your snubber will go. You will need a sinewave generator and by clicking the green boxes on the spreadsheet you'll get the help dialogue.

Don't know if a snubber will solve your problem though. If this is audible buzzing from the TX which was not previously there, could this be loose laminations? What circuit is this?
  Reply With Quote
Old 21st October 2013, 04:15 PM   #25
vita is offline vita  Italy
diyAudio Member
Join Date: Dec 2005
Location: i do not remember
Default Almost solved

thank you for yours answer , no brobleme for the delay , because in the meantime , I found part of the problem :
when I rebuilt this amp, on the PSU board, I have put 1N4007 diodes ( original4003 ), but on the pcb audio I mistakenly installed diodes UF4007 , apparently , the amp n ' not like fast diodes , so before putting standard diodes, I put on fast diodes as the PSU Board, just to see if the noise increased , the noise is effectively increased.
Now as you can see from the picture I drew of " circles " red marks were raised , by dint of desoldering and soldering ,
because the wire of the transformer are not flexible but rigid.
Traces no longer flat , I think it also affects the noise.
In the near future , I want to install one transformer per channel, making it dual mono fully and remove PSU Board , the original transformer is toroidal with respect to drawing I made ​​in my last post , it has no screen between primary and secondary , not grounding (I had to put it in the resin because there was a vibration from the coil.
With these changes , I hope to do without snubber .

Thank you,
Best Regards
Attached Images
File Type: jpg pcb sumo.JPG (692.5 KB, 66 views)
File Type: jpg Xformer.JPG (553.0 KB, 66 views)
  Reply With Quote


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 11:34 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2