expensive capacitor? - Page 1
Forum section: electronics / beginners

author: 3roomlab
author_rank: Frequent Contributor
timestamp: February 24, 2015, 05:36:51 am
content: i saw this capacitor. 22uF 800v approx USD200suppose to be some sort of MKP i think(made in china)

author: Rerouter
author_rank: Super Contributor
timestamp: February 24, 2015, 09:42:38 am
content: It is intended for audiophiles, add 2 zeros and you will still find capacitors sold at that for this market, you can even find tone balancing rocks for that much, and they sell...

author: Psi
author_rank: Super Contributor
timestamp: February 24, 2015, 10:06:25 am
content: http://www.digikey.com/product-detail/en/WF165336WQ75233BJ1/WF165336WQ75233BJ1-ND/5086082

author: janoc
author_rank: Super Contributor
timestamp: February 24, 2015, 10:53:19 am
content: Oh, audio stuff ... All reason tends to leave the room in that case. My favourite are probably the "wooden" capacitors from here:http://studiozey.com/woodencapacitor/index.htmlDon't expect audiophools to behave in a rational way or to pay sensible prices for components ...

author: PeterFW
author_rank: Frequent Contributor
timestamp: February 24, 2015, 11:06:39 am
content: You have to be a bit out of touch with reality to buy those caps.Here are some capacitor review quotes from this site:http://www.humblehomemadehifi.com/Cap.htmlQuoteQuoteQuote

author: Zero999
author_rank: Super Contributor
timestamp: February 24, 2015, 01:52:27 pm
content: Quote from: Psi on February 24, 2015, 10:06:25 amBut there's a reason for that: high voltage, close tolerance.

author: jpb
author_rank: Super Contributor
timestamp: February 24, 2015, 02:55:26 pm
content: Those are a lot of money for low capacitance values.The prices of low ESR highish Voltage large value capacitors (for linear power supplies) get pretty expensive (I was searching through the lists on Farnell recently and the more expensive ones were in the 100s of pounds/dollars). But I guess if you're building a very low noise supply for sensitive electronic instrumentation then the cost is not a major component of the overall expense.eghttp://uk.farnell.com/epcos/b43740a5109m000/cap-alu-elec-10000uf-450v-screw/dp/2284046

author: SeanB
author_rank: Super Contributor
timestamp: February 24, 2015, 04:20:26 pm
content: 4uF 4kV capacitors for laser excitation are pretty expensive as well, but they are constructed to survive. Those are ordinary polycarbonate film units with a fancy outer case and an epoxy end fill added to an existing unit. Strip the case off and under it you will find a regular yellow cased axial capacitor.

author: amyk
author_rank: Super Contributor
timestamp: February 24, 2015, 05:18:14 pm
content: Quote from: Hero999 on February 24, 2015, 01:52:27 pmAnd it'swater cooled.

author: SeanB
author_rank: Super Contributor
timestamp: February 25, 2015, 06:16:49 pm
content: No, the audiofool caps are regular polywhatever with the wanky case. The laser caps were made from proper polycarbonate sheet with a foil bonded to the one side, and 2 rolled up into a sandwich with the foils bonded on the end with multiple tabs to the terminals, and the whole lot was vacuum impregnated with oil ( a really nice PCB oil as well, which was the same dielectric constant as the plastic foil so that voids were not going to create a problem) and then sealed into a tinned steel can with glass seals for the leads. the whole can was dipped in a solder bath to seal it, with a nice soldered pipe for the oil fill. I never knew of them changing one, and the price in the stores system was expensive, even for military parts. The failure mode of the laser was the flash pump tube exploding into powder and taking out the ruby rod with it. Often you had to change the rod, pump tube, mirrors and chamber after this from the damage done to them.