Rectifier caps?

supernet · 27th June 2002, 05:29 PM

What is the best capacitor to put on rectifier bridge to supress RF signals? Should I use 100n ceramic or MKP?

Supernet

tiroth · 27th June 2002, 05:48 PM

I couldn't find the post, but there was some discussion recently and a link to a whitepaper that had some theory behind this.

http://131.109.59.51/images/pdf/Calc...m_Snubbers.pdf

Probably more important than dielectric.

tvi · 27th June 2002, 05:48 PM

One of the first mods I did in my system some many years ago was to change the typical Japanese Mylar caps that Onkyo used across the diodes in the bridge rectifier.

I changed them to Wima MKC10s Polycarbonates (from memory) as I had them, they fitted the PCB space and were the right Voltage. It made a very noticalble improvement in the high end and I think the image was improved.

I think the original Mylars (sometimes called Green caps, in Australia at least) were of a fairly inductive type as compared to the stacked foil Wimas so that may have been a factor?

Eventually I improved that Amplifier to death

I'd try the Cetramics as long as they are good multilayer types.

Regards
James

27th June 2002, 05:29 PM	#1
supernet diyAudio Member Join Date: Dec 2001 Location: Europe	Rectifier caps? What is the best capacitor to put on rectifier bridge to supress RF signals? Should I use 100n ceramic or MKP? Supernet

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27th June 2002, 05:48 PM	#2
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	I couldn't find the post, but there was some discussion recently and a link to a whitepaper that had some theory behind this. http://131.109.59.51/images/pdf/Calc...m_Snubbers.pdf Probably more important than dielectric.

27th June 2002, 05:48 PM	#3
tvi diyAudio Member Join Date: Apr 2001 Location: Moonee Ponds, Vic, Australia	One of the first mods I did in my system some many years ago was to change the typical Japanese Mylar caps that Onkyo used across the diodes in the bridge rectifier. I changed them to Wima MKC10s Polycarbonates (from memory) as I had them, they fitted the PCB space and were the right Voltage. It made a very noticalble improvement in the high end and I think the image was improved. I think the original Mylars (sometimes called Green caps, in Australia at least) were of a fairly inductive type as compared to the stacked foil Wimas so that may have been a factor? Eventually I improved that Amplifier to death I'd try the Cetramics as long as they are good multilayer types. Regards James