capacitor help needed

dube · 24th July 2006, 06:20 PM

well i have blown a capacitor on my crossover and iam in need of a replacement any sujestion ?? it is a bennic. bi-polar.47 mfd.100 wv. and since i have my speakers apart iwas thinking about some more damping material or any diy upgrade

THANKS GARY

Netlist · 24th July 2006, 08:09 PM

Gary,

If the value is not too critical you can make your own bipolar by using two 100µF caps.
Connect them in series but tie both negative legs together and use both positive legs as the terminals.

/Hugo

AndrewT · 25th July 2006, 09:29 AM

Hi,
is it 0.47mfd or 47mfd or 0.47uF or 47uF?

If it is only 0.47 then a 100V plastic film can be used. This might change the sound for the better or worse.

If 47uF then 100V bi-polar electrolytics are available. My Rapid catalogue shows them at £0.19 each. You could use a motor start, plastic film cap here if you want the highest spec but they are very bulky and expensive.

dube · 25th July 2006, 02:25 PM

it is a 47 mfd

just looking for a good replacment

thanks gary

AndrewT · 25th July 2006, 02:41 PM

Hi,
is this another US manufacturer mis-using mfd when they mean micro farad (uF)

47uF 100V bipolar are readily available. It cannot be 47,000uF 100V or could it?

Panasonic are reputedly very good but many others are out there.

hughmon · 25th July 2006, 02:41 PM

These guys carry Bennics, though the closest value they stock to 47uF seems to be 50uF.

http://www.madisound.com/cgi-bin/ind...eywords=Bennic

Dick West · 25th July 2006, 06:08 PM

50 uF is close enough. Many caps are rated ±10% and then listed for the top end of that range. In other words, a 50 uF cap could "really" be a 47 or even 45 uF.

As I recall the original poster listed this cap as being in the tweeter circuit. 47 uF is a very large value for that location in a schematic. I think that 4.7 uF would be closer to what is needed.

Or, is this a 3-way speaker and the cap is in the midrange driver circuit.?

Also, how do you know this cap needs to be replaced? Did you test it?

Netlist · 26th July 2006, 09:33 AM

Quote:

Originally posted by Dick West

Also, how do you know this cap needs to be replaced? Did you test it?

The can looks very empty on the picture.

/Hugo

jacco vermeulen · 26th July 2006, 10:05 AM

That's not a dead capacitor.
It's a Norwegian Blue cap and it's resting !

pinkmouse · 26th July 2006, 10:21 AM

Nah mate, it's pining for the fjords...

25th July 2006, 09:29 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, is it 0.47mfd or 47mfd or 0.47uF or 47uF? If it is only 0.47 then a 100V plastic film can be used. This might change the sound for the better or worse. If 47uF then 100V bi-polar electrolytics are available. My Rapid catalogue shows them at £0.19 each. You could use a motor start, plastic film cap here if you want the highest spec but they are very bulky and expensive. __________________ regards Andrew T.

25th July 2006, 02:41 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, is this another US manufacturer mis-using mfd when they mean micro farad (uF) 47uF 100V bipolar are readily available. It cannot be 47,000uF 100V or could it? Panasonic are reputedly very good but many others are out there. __________________ regards Andrew T.

26th July 2006, 10:21 AM	#10
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Nah mate, it's pining for the fjords... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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24th July 2006, 08:09 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	Gary, If the value is not too critical you can make your own bipolar by using two 100µF caps. Connect them in series but tie both negative legs together and use both positive legs as the terminals. /Hugo

25th July 2006, 02:25 PM	#4
dube diyAudio Member Join Date: Jul 2006	it is a 47 mfd just looking for a good replacment thanks gary

25th July 2006, 02:41 PM	#6
hughmon diyAudio Member Join Date: Jun 2004 Location: Los Angeles	These guys carry Bennics, though the closest value they stock to 47uF seems to be 50uF. http://www.madisound.com/cgi-bin/ind...eywords=Bennic

25th July 2006, 06:08 PM	#7
Dick West diyAudio Member Join Date: Aug 2004 Location: Illinois	50 uF is close enough. Many caps are rated ±10% and then listed for the top end of that range. In other words, a 50 uF cap could "really" be a 47 or even 45 uF. As I recall the original poster listed this cap as being in the tweeter circuit. 47 uF is a very large value for that location in a schematic. I think that 4.7 uF would be closer to what is needed. Or, is this a 3-way speaker and the cap is in the midrange driver circuit.? Also, how do you know this cap needs to be replaced? Did you test it?

26th July 2006, 10:05 AM	#9
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	That's not a dead capacitor. It's a Norwegian Blue cap and it's resting !

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