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I remember reading that some people have said that when installing certain caps, you need to be careful of what the caps touch when tieing them down to make them secure. There are certain sticky-backed tapes,etc. that when touching the tape, the cap can take on the dielectric characteristic of that tape. Is there any type of cushy material that can be used that doesn't have a dielectric characteristic?
Follow Ups:
being tied to the bed. It really got her "going".
Years later I tried to tie down my ex-wife, but she wanted no part of it.
No sense of adventure!Use hot melt sparingly. A little goes a long way. Too much and you'll have trouble removing the caps. if you change your mind or whatever.
3M two sided vinyl and uerathane foam tape is best, but it's $50-75 a roll.
Don't use the cheap two sided from the drug store. It won't work/last.
...nylon slip tie and some 3M double-sided tape under the cap.
I can clearly see what your after with regards to the sonic effects of how the cap is mounted to the PCB.What one needs to be concerned with is the parasitic resonance nature of the PCB itself and mounting/securing the caps to the PCB will cause a sonic shift in the caps signature.
I have found 3M Window Weld to be an excellent interface between PCB components which are tightly attached to a PCB such as caps. It is such that one need not secure a cap with double sided tape or tie wraps as it's adhesion properties are varacious.
The WW also has an excellent dampening nature due to it's moleculer structure which allows it to be extremely malleable.
I have been using this stuff for years and I know of at least one high end speaker manufacturer that uses it as the interface material between the drivers and the enclosure baffle.
Cheers,
This is just the stuff I was looking for. Can this Window Weld be found at Home Depot ?
U can find it at most well stocked auto parts stores or U can order it online. I know some Auto Zone stores carry it.One word of caution though, don't stick it where multiple or adjacent PCB traces would come in contact with the Window Weld.. If this cannot be avoided, use some tape to cover the traces before applying the Window Weld to avoid the possibility of electrically shorting them. I found this out the hard way!!
Cheers,
~kenster
- http://www.midwayautosupply.com/pc-410-60-3m-window-weld-round-ribbon-sealer-black-38-x-15-kit-08612.aspx (Open in New Window)
Over in the Cables Asylum, cotton is constantly touted as having the best dielectric properties next to air. If it's at all practical, try wrapping the caps with some cotton fabric, then tie them down loosely with some cotton twine or thread. Don't get it too tight as you don't want to compress the cap's casing - that'll screw it up more than what you wrap them in.Also, be aware that if the caps you plan on tying get warm while in use, the cotton will trap some of that heat - a caveat.
I would be nervous about using cotton inside a component. All it takes is one resistor to blow and you have an instant fire.I have always used 3M tape and zip ties. Just be sure not to overdo it with the zip ties as you can ruin the integrity of the casing if too tight.
that sounds pretty scary to me! i really don't think you're going to have a majorly adverse dialectric effect from a plastic zip tie.
Not a good idea to wrap caps and tie them down with highly flamable cotton.
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