did ceramic capacitor electrostriction improve? - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: October 15, 2024, 09:14:45 pm
content: If you have noisy old Z5U or similar capacitors, you know it.I had buzzing ones before, that I replaced with NOS (vintage) same value parts, SLCC, and they buzz.But, I never tried to buy a newly manufactured component.I know the capacitor ratings are a bit of mystery meat, its a temp spec not a composition spec.Have formulations improved from any manufacturers where there is less electrostriction (noise?). I know you can replace em with foil and stuff, but the filter performance is unrivaled, SLCC does way better for high frequencies then anything else really.Will the same temp rating same form factor capacitor be any better then one manufactured in 1960? I was hoping they maybe improved their formulations some how.I did buy some to test this, from Vishay, but I feel like trying anything further is just going on a wild goose hunt. Maybe there is a manufacturer that is known for some kind of 'quiet' improvements?https://twen.rs-online.com/web/p/single-layer-ceramic-capacitors/1816505My requirements:1) same value2)SLCC3) disk form

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: October 15, 2024, 11:22:34 pm
content: I could be wrong but I don't think the basic materials have changed much. If you want high k it comes with high piezoelectric effect and noise. If you have more space, use a lower k capacitor.

author: coppercone2
author_rank: Super Contributor
timestamp: October 16, 2024, 12:13:35 am
content: I just realized I had the equipment to measure this. It should be interesting to see a before and after.I wonder if the noise is not being delt with, or if the foil cap deal with the noise without making noise. I can measure this with a spectrum analyzer probe I think.spectrum analyzer access is blocked by debris right now. My work bench needs a little RC bulldozer to clean it. I will do it tommorow, ill lose track of what i forgot to do if i disturb thisi swear its unapproachable, I almost did something like 4 times and I stopped after every attempt

author: TimFox
author_rank: Super Contributor
timestamp: October 16, 2024, 03:20:32 am
content: Single-layer disc capacitors, of course, are lower in capacitance (all other things being equal) than MLCC for the same footprint.Therefore, keeping to low-K (good, linear) dielectrics limits your maximum capacitance (all other things being equal) in SL.What capacitance and voltage do you need?

author: coppercone2
author_rank: Super Contributor
timestamp: October 16, 2024, 03:23:00 am
content: I linked the cap I bought to try, its 50nF and alot of volts, its my experiment. Its some similarly 'bad' tempco material, not sure exactly what the original is, probobly the worst one.But I was more wondering if perhaps some manufacturer has a reputation for having 'improved' things for that material class.I thought it might be a parameter that can be controlled without effecting the K

author: coppercone2
author_rank: Super Contributor
timestamp: October 16, 2024, 11:03:20 pm
content: and of course, if someone knows of a 50nF capacitor SLCC that is a better dielectric, I would like to know about it.It seems their either ridiculously small C0G (pF) or horrible dielectric.Do class 2 throughhole disks exist? Like +-20% or better. not the 56 ones, I think the 56 ones are the noisy ones.

author: TimFox
author_rank: Super Contributor
timestamp: October 16, 2024, 11:30:36 pm
content: https://www.vishay.com/docs/23140/geninfodcdiscrfisafe.pdfCeramite disc capacitor catalog: all through-hole, different dielectrics.