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In Reply to: RE: vibration tweak posted by moray james on July 07, 2010 at 22:08:48
Moray, thank your for the feedback. I have never opened my cdp and hence don't know where the quart ocillators are located. Any pointers? I have marble tile weights on my sub, but will take your advice and try the sand bags. Thanks.
kendo
Follow Ups:
Kendo: the oscillator is usually a flat chrome looking can about a half inch high and three eights wide and an eight of an inch thick usually only one so it stands out and is easy to spot. If you make a little doughnut shaped bag from some spandex you can get a good layer of sand around it and the fit will be snug. A simple bag large enough to flop over the oscillator and a rubber band will achieve the same results if your sewing skills are basic. Works well. You can also use small flat sandbags on circuit boards but be careful to make sure you don't damp components (cover up) that get hot and need to be air cooled. There are special gel filled bags made for this application which have a gel version of antifreeze in them and they actually move the heat away from the device and help maintain thermal consistency across the circuit board. I have seen these installed below and above the board and they are very effective in small cases where the packs couple heat from the board to the case. So they act as both a heat sink and a damping pad at the same time.
If you just want to experiment with the sand bag on the oscillator you can use a small thin plastic baggie filled with sand and place that over the oscillator. If you use a corner of the bag it will envelope the device and wrap it in a bundle of sand. Cloth sand bags can also be placed under boards (in contact) to damp vibrations of sections of a board if you size them and place them properly they will stay in place. Again make sure you take ventilation into account.
moray james
Edits: 07/09/10
Moray, Jon and Wirewizard, thank you so much for the info. Moray do you know where to obtain the gel bags? Have any of you tried Vibration Magic? Wirewizard,do you damp your speakers? I placed marble tile weights on mine and helped a little. I think I will try sand bags also.
kendo
sorry I cannot recall the product name or company and I have searched for some time looking without success. The gel packs were for both thermal management as well as damping vibration of circuit boards in high density applications. The bag material was very compliant and conformed well to devices on the board to optimize surface contact. The bags were also resistant to puncture so they could be used on both sides of a circuit board to sandwich it between the top and bottom of a case. sorry I could not find more but somebody knows what they are called. Perhaps if you asked some suppliers of thermal management products. The link below might also be of interest.
http://www.amecthermasol.co.uk/AmecThermasolFlatCoolPipes.html
moray james
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