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Electrical parts.

Eli, can ya find a 24uF cap on there? i couldnt. 250V btw.

in fact, they dont have a polypropylene cap that goes above 2.2uF

MIKE
 
Originally posted by: nourdmrolNMT1
heh, nope even after asking technical support there, they dont have any.

MIKE
Click to expand...
:Q

Damn, must be a pretty rare part....

Holy sh!t, 24uf, 250v caps are like, big.... definately not your average Radio Shack part.

Maybe here
 
6.8 ohm 10W resistor:
Xicon 5% Cement Power resistor, axial leads.
Mouser part num: 280-CR10-6.8
Price each: $0.55

24 uf 250V capacitor:

Closest I could find (I didn't search all of the catalog) is a 22uf 250V in several styles. It would probably work fine - large value electrolytics have a very wide tolerance range. However, you could add a 2.2uf in parallel with the 22uf to get an equivalent 24.2uf cap.

Nichicon Aluminum electrolytic capacitor, UVR 85C General Purpose Series (lead free):
22uf 250V
Mouser part num: 647-UVR2E220MHD
Price each: $0.61

2.2uF 250V
Mouser part num: 647-UVR2E2R2MED
Price each: $0.31

(These are radial lead, polarized electrolytics. If you need NPO, or want axial lead or other styles check Mouser's catalog.)

I copied these from Mouser's Nov - Jan 2005 printed catalog. Please check www.mouser.com online for correctness and ordering info.
Good luck!
 
Eli's on the right track.

Here's what I'd do though....

You are obviously building a passive crossover. These require high voltage NPO caps. Go here:

http://www.allelectronics.com/...gory=140900&type=store

The 24uF 250V can be accomplished by putting three 80uF 100V caps in series. The equivalent capacitanace is then 80/3, which is close enough to 24uF. It will also give you a voltage rating of 100*3, or 300V, which exceeds your requirement. These type of caps are generally +/- 10% anyway.

I would wind the coils myself, since I have an LCR meter, but if you don't, do you have access to one at the university? It would be quite simple to make these with plain magnet wire, available at RS. You may also try Eli's link, or the one I gave you and do a generic search. Again, the other cap can be constructed with three NPOs in series, just take the 4.3uF*3 and find an NPO that is close from the same page I gave you above.

HTH
 
Ok, so on Partsexpress, for the 24uF 250V cap, i got 2 12uF 250V's in parrallel should give me 24uF. and the 6.8ohm 10watt resistor i threw a 1.8ohm 10watt, and a 5.0ohm 10 watt in series should give me 6.8ohm.

basically this was just a price out, but i couldnt find those parts, and they ended up being quite rare which was interesting.

MIKE
 
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