Buying a New Aluminium Capacitor Kit, Advice and anyone else Interested? - Page 1
Forum section: electronics / general

author: alcs2000au
author_rank: Contributor
timestamp: November 19, 2011, 04:19:50 am
content: Hey GuysI decided to make myself a new aluminium capacitor kit as my current one consists of cheap ebay caps that more often than not go bad or don't behave as they should, enough is enough...So I have two questions for you guys, first what do you think of the capacitors / cap kit below? (digikey prices) Any recommendations? Any comments?The caps where selected based onhttp://www.badcaps.net/forum/showthread.php?t=2280Panasonic FC Caps:http://industrial.panasonic.com/www-data/pdf/ABA0000/ABA0000CE22.pdf50 P11212-ND CAP ALUM 10UF 25V 20% RADIAL AU$7.4150 P11213-ND CAP ALUM 22UF 25V 20% RADIAL AU$8.0850 P11215-ND CAP ALUM 39UF 25V 20% RADIAL AU$8.8450 P10267-ND CAP ALUM 47UF 25V 20% RADIAL AU$8.8450 P10269-ND CAP ALUM 100UF 25V 20% RADIAL AU$8.8450 P10271-ND CAP ALUM 220UF 25V 20% RADIAL AU$12.6650 P10273-ND CAP ALUM 330UF 25V 20% RADIAL AU$15.6610 P10278-ND CAP ALUM 1000UF 25V 20% RADIAL U$9.7Second question would be if there is anyone here living in Australia that would want a kit too, could get them cheaper if there was two of us or a lot cheaper if we could get like 10 kits.Let me know what you think!Adrian

author: joelby
author_rank: Frequent Contributor
timestamp: November 19, 2011, 06:59:59 am
content: If element14 sell these caps, it would be worth asking their sales team for a quote, giving the Digikey pricing as your target. They may be able to do better and you'll get free shipping, and you don't have anything to lose by trying.

author: alcs2000au
author_rank: Contributor
timestamp: November 19, 2011, 07:58:56 am
content: Thanks, might try that. But are would they really potentially go that much lower? They are charging more than twice as much as digikey on their site!Shipping is free on digikey too once over 200 dollars which I will be anyway for this order.Adrian

author: slateraptor
author_rank: Frequent Contributor
timestamp: November 19, 2011, 09:53:15 am
content: Some thoughts on your selection:1.)If you're going with +/-20% electrolytic caps, there's really little need to stock beyond E6 preferred numbers: 10, 15, 22, 33, 47, 68 (Why 39uF E12 oddball?)1a.)15 can be dropped to reduce overall costs since bypassing is typical application domain for electrolytics; 68 fills a gaping hole nicely though2.)1mF for a general purpose kit seems overkill, especially for the price. I'd leave that to an as-needed basis.3.)You're cutting yourself short by sticking strictly to 25V rating.So for Panasonic FC series 20% tolerance, radial package, and minimum 25V rating at qty 50 as a gauge for selection on DigiKey:10uF:P10316-ND US$0.62 more at qty 50, 50V rating, 60mA higher ripple current tolerance, and 700mOhm lower impedance over P11212-ND22uF:P11230-ND same price, 35V rating, 55mA better RC tolerance, 150mOhm lower impedance over P11213-ND33uF:P10290-ND US$0.71 cheaper, 35V, 80mOhm impedance, same RC tolerance as E12 oddball47uF:P11232-ND same price; 35V, 115mA higher RC tolerance, 450mOhm lower impedance over P10267-ND68uF:P10292-ND fills a gaping hole that would cost twice as much if using 47u || 22u100uF:Keep P10269-ND; price difference for performance is steep for higher value caps220uF:Keep P10271-ND330uF:Keep P10273-ND; qty 10 to reduce costs for less used values.470u:P10274-ND; qty 10...680u:P10277-ND; qty 10...With the bit of justification given, I feel like this is a more practical kit. Food for thought.

author: Zero999
author_rank: Super Contributor
timestamp: November 19, 2011, 10:32:50 am
content: Quote from: slateraptor on November 19, 2011, 09:53:15 amI agree, even the E3 series, 10, 22 and 47 is good enough for most applications.Go for, E3 10uF to 10,000uF which is just 10 different values to stock. For lower values use tantalum, film and ceramics. There's not much point in stocking high values as they become increasingly more expensive and can be purchased as one-offs for specific projects.

author: joelby
author_rank: Frequent Contributor
timestamp: November 20, 2011, 12:43:50 pm
content: Quote from: alcs2000au on November 19, 2011, 07:58:56 amIn my experience, they can and will beat Digikey pricing. It's definitely worth a try!

author: alcs2000au
author_rank: Contributor
timestamp: November 20, 2011, 11:54:56 pm
content: Thanks guys for the great and detailed advice, I will change my order accordingly and also ask element14 for an offer! Cheers

author: alcs2000au
author_rank: Contributor
timestamp: November 21, 2011, 05:09:10 am
content: Just placed my order, element14 did in deed make an offer I could not refuse. Cheers!

author: joelby
author_rank: Frequent Contributor
timestamp: November 21, 2011, 05:27:30 am
content: Great!Did they beat Digikey's prices convincingly?

author: alcs2000au
author_rank: Contributor
timestamp: November 21, 2011, 08:09:25 am
content: They did most of the time, but a couple of times stayed more expensive. In the end cost ended up being slightly cheaper than digikey on the goods, however with the free shipping element14 ended up roughly 20% cheaper!