Newbie: Help finding 560nF capacitors for electronic crossover?
I recently purchased a used Sentec EC-9 electronic crossover filter. The problem is that the filter frequency was set to 170Hz and I would like to use 80Hz.
I got hold of conversion table for different frequencies and now I need a suitable 560nF capacitor. There seams to quite hard to find these in Sweden, so I would be very thankful if someone could help me find a company that have these components and ships to Sweden.
The physical dimension of the needed capacitor would be, width max 4,5 mm and height 10 mm to suit the board.
I'm a newbie att this so I'm also wondering which type is best for use with audio applications in mind?
560 is an E12 value. These are less available in capacitor values.
Try to use E6 values and parallel two values to give close to what you need.
E6=10, 15, 22, 33, 47, 68 and the decades above or below.
note, 220+330=550, just 2% different.
The tolerance of your caps will probably be 5% or 10%.
If you can select to better than 5% then do so.
Most builders recommend using 1% or 2% capacitors for electronic filters.
The smallest through-hole non-ceramic 0.56uF capacitor that I know of is a metalized polyester film 0.56uF capacitor, an AVX 63V "box" model (Mouser.com 581-BQ074D0564J; search there to find datasheet), with a footprint of 5mm x 7.5mm, with 8mm vertical height and approx 5mm lead spacing.
If something like that won't fit, maybe you could do as Andrew suggested and parallel some 0.22uF and 0.33uF and 0.01uF (or just 0.22uF and 0.33uF for 0.55uF, or just 0.47uF and 0.10uF for 0.57uF), possibly mounting some of them on the other side of the board, if you don't want to use longer leads.
Or, a search at digikey.com might find a suitably-sized 0.56uF cap, for which you might then be able to find a closer supplier.
OK, I searched at digikey.com and found only five 0.56uF film caps that had 5mm or 5.08mm lead spacing (All others were larger.):
Panasonic ECQ-V1H564JL3 (Digikey # P4534TB-ND)
Panasonic ECQ-V1H564JL (Digikey # P4672-ND)
BC Components 2222 370 11564 (Digikey # BC1634-ND)
AVX BF074D0564J (Digikey # 478-2052-ND)
AVX BQ074D0564J (Digikey # BQ074D0564J-ND)
You can go to digikey.com to find their datasheets, to see what their sizes are.
- Tom Gootee
Hi Andrew and thanks for the reply!
I just ordered 100nF and 470nF caps to combine. Ordered some extras and will try to match them as closely as possibly.
keep in mind that the individual caps do not need to match each other.
It's the total that should match.
eg. 99nF+466nF = 102nF+461nF within 0.4% and is only <1% away from the desired value.
Try to get a match for low pass and high pass. Also try to match between the channels. That makes 4sets of similar capacitance for a single pole filter. A two pole active filter requires 8 matched sets.
Guess how many sets are needed for a 4pole active filter.
Guess which tolerates inaccuracy least?
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