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CheapoModo: quick and dirty transformer snubber bellringer jig
CheapoModo: quick and dirty transformer snubber bellringer jig
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Old 1st September 2018, 09:05 PM   #271
HarmonicTHD is offline HarmonicTHD  Switzerland
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Provided my experimental setup and measurements were sound, the question comes to mind if for this particular toroid a simple C element would suffice. Wouldn’t any decently engineered audio amp be unaffected by any ringing wether it is at 500kHz or even 1Mhz?

During the next weeks I will look at the PSU output and compare it with CRC snubber and with only C 150nF.

Last edited by HarmonicTHD; 1st September 2018 at 09:08 PM.
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Old 14th September 2018, 04:28 PM   #272
t-minik is offline t-minik  France
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Hi all.

Thanks for your hard work on that nice tool.

can you recommend any rule on capacitor voltage rating or technology for Cs and Cx caps ?

eg : I want to snubb a 25VAC transformer so I need 3x or 4x 25V rating caps to be safe

Thanks in advance and best regards.
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Old 14th September 2018, 05:15 PM   #273
HarmonicTHD is offline HarmonicTHD  Switzerland
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Google this Part No.
R82EC3100AA70J

It is a Kemet Cap 0.1uF, 100V excellently suited for snubber caps. Of course also available in different uF values.
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Old 14th September 2018, 05:50 PM   #274
Mark Johnson is offline Mark Johnson  United States
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CheapoModo: quick and dirty transformer snubber bellringer jig
Generally I use the Epcos B32529 series of film capacitors, with 250V DC rating. Going up to 400V wouldn't hurt anything.

Be sure to use the very same capacitors in your Cheapomodo testing, that you solder into your final equipment. That way your dialled-up optimum Rs will include the actual (rather than the stated) capacitance.
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Old 14th September 2018, 08:58 PM   #275
t-minik is offline t-minik  France
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OK

Thanks a lot, so I guess voltage rating is not so important unless it's sufficient.
You both point me on polyester capacitors, I'll give a try.

Of course caps used for testing must be those for snubbing.

Thanks a lot

Thanks
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