Carlspeak Posted August 12, 2012 Report Share Posted August 12, 2012 Detail performance tests were run on four ERSE capacitors to look at the effect of dielectric on ESR. Two 2.0 uF and two 3.9 (4.0) caps were tested. Each group had a polypropylene dielectric (Pulse-X brand with black color & gold printing) and a Polyester dielectric (yellow color with black printing).What I found with these two levels of capacitance was a significant difference in ESR between the dielectrics in the 100 to 10000 hz range with PET generally trending higher in the freq. range evaluated. Below is a plot of the data obtained with a WT2.IMO, the polyester ESR performance approaches that of an electrolytic. This may be of some value to those recapping that don't want to alter the voicing of the speaker or, where a slightly reduced response is needed in a particular frequency range.The link below gives a good explanation of why ESR is different between the dielectrics.http://www.cartage.org.lb/en/themes/sciences/physics/electromagnetism/electrostatics/Capacitors/Applications/PhysicalConsiderations/PhysicalConsiderations.htmpp vs pet cap tests.pdf Quote Link to comment Share on other sites More sharing options...
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