Buying a New Aluminium Capacitor Kit, Advice and anyone else Interested?

[alcs2000au]

Hey Guys

I 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 on http://www.badcaps.net/forum/showthread.php?t=2280

Panasonic FC Caps: http://industrial.panasonic.com/www-data/pdf/ABA0000/ABA0000CE22.pdf

50   P11212-ND   CAP ALUM 10UF 25V 20% RADIAL      AU$7.41
50   P11213-ND   CAP ALUM 22UF 25V 20% RADIAL      AU$8.08
50   P11215-ND   CAP ALUM 39UF 25V 20% RADIAL      AU$8.84
50   P10267-ND   CAP ALUM 47UF 25V 20% RADIAL      AU$8.84
50   P10269-ND   CAP ALUM 100UF 25V 20% RADIAL      AU$8.84
50   P10271-ND   CAP ALUM 220UF 25V 20% RADIAL      AU$12.66
50   P10273-ND   CAP ALUM 330UF 25V 20% RADIAL      AU$15.66
10   P10278-ND   CAP ALUM 1000UF 25V 20% RADIAL   U$9.7

Second 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

[joelby]

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.

[alcs2000au]

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

[slateraptor]

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 though
2.) 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-ND

22uF: P11230-ND same price, 35V rating, 55mA better RC tolerance, 150mOhm lower impedance over P11213-ND

33uF: P10290-ND US$0.71 cheaper, 35V, 80mOhm impedance, same RC tolerance as E12 oddball

47uF: P11232-ND same price; 35V, 115mA higher RC tolerance, 450mOhm lower impedance over P10267-ND

68uF: P10292-ND fills a gaping hole that would cost twice as much if using 47u || 22u

100uF: Keep P10269-ND; price difference for performance is steep for higher value caps

220uF: Keep P10271-ND

330uF: 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.

[Zero999]

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? )

I 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.

[joelby]

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!

In my experience, they can and will beat Digikey pricing. It's definitely worth a try!

[alcs2000au]

Thanks guys for the great and detailed advice, I will change my order accordingly and also ask element14 for an offer! Cheers

[alcs2000au]

Just placed my order, element14 did in deed make an offer I could not refuse. Cheers!

[joelby]

Great! Did they beat Digikey's prices convincingly?

[alcs2000au]

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!