Aussie Capacitors

[epineh]

I am planning my next build and am starting to source parts, wondering if there are any reasonable suppliers for caps in Australia, I am looking at around 80 000uF to 100 000 uF values rated at about 80Volts.

Any suggestions welcome.

Russell.

[smarbaga]

hello
80 - 100,000 is a very large capacitor
hard to find and costly.
perhaps 8 to 12, 8 to 10,000 uf's in parallel
- would be cheaper,
- easier to find,
- and easier to place in a box.
c1+c2+c3+c....... = cTotal ( in parallel ).
* just a sugestion

[epineh]

Yup, certainly are hard to find, I have a 80,000 uF in my current router, 3 driver cards pulling about 2 amps each, works well. Next machine will be a little more serious, Caps will have their own enclosure, bleed up resistors and control gear to limit inrush currents, looking at about 10-12 of 100,000 uF caps in parallel, small busbar configuration, with high strand count flexible cables straight to the driver cards, looking at giving servo's best chance of solid pwr supply...

Russell.

[smarbaga]

the capasitors are only going to supply momentary current to compensate for a voltage dip.
the wire to them does not have to be that big.
maybe 18 gauge at the most.

[CountZero]

One advantage of using parallell capacitors is also reduced effect of ESR

[toneV8]

What is ESR

[epineh]

Equivalent Series Resistance, have a look here :

http://www.awiz.com/cwinfo.htm

this is just a site for an ESR meter, but it might help for an explanation.

Managed to find Cap's through Farnell, just like to shop around a bit, also better work out what size and how many I need, it is a work in progress...

Russell.