Need small coupling capacitors

pandaemonium9 · 12th November 2006, 07:34 PM

I would like to replace the electrolytic coupling capacitors in my pre-amp and DSP but I have too little room on the boards for big poly caps. Anyone know of any small decent caps I could use? They currently use 4.7uF@50v between NE5532s (changed from 4558s). Would it be useful to use small value, high-grade bypass caps across the electrolytics?

sharpi31 · 12th November 2006, 09:07 PM

Black Gate N 4.7uF 50V are great for signal coupling and PSU duties, and not too expensive....

Minion · 12th November 2006, 11:37 PM

You can also use good quality Metal Film or Mylar Caps which are Much smaller than Poly caps but offer simular performance and can be found for a fraction the price of Poly caps....

I recently picked up 100 0.1uF Metal Film caps for about $3.....

Cheers

RogerGustavsson · 13th November 2006, 05:00 AM

Look for Wima MKS2 or Evox Rifa MMK. Both uses metallized polyester film (mylar). 4.7 µF/50V are 7.2x7.2x13 mm. Pitch is 5 mm. Wima can supply 6.8 and 10 µF too but with a lower voltage rating.

AndrewT · 13th November 2006, 06:51 PM

Hi,
is the pre a valve (tube) type or opamps?

If opamps then you don't need 50V cap rating.

A metallised plastic film is better than any exotic electrolytic. But they are usually bigger.
Search the catalogues to find something that fits.
BTW 4.7uF in that 7mm package is very small. You will struggle to find anything smaller.

12th November 2006, 07:34 PM	#1
pandaemonium9 diyAudio Member Join Date: Nov 2005 Location: Canada	Need small coupling capacitors I would like to replace the electrolytic coupling capacitors in my pre-amp and DSP but I have too little room on the boards for big poly caps. Anyone know of any small decent caps I could use? They currently use 4.7uF@50v between NE5532s (changed from 4558s). Would it be useful to use small value, high-grade bypass caps across the electrolytics?

13th November 2006, 06:51 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, is the pre a valve (tube) type or opamps? If opamps then you don't need 50V cap rating. A metallised plastic film is better than any exotic electrolytic. But they are usually bigger. Search the catalogues to find something that fits. BTW 4.7uF in that 7mm package is very small. You will struggle to find anything smaller. __________________ regards Andrew T.

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12th November 2006, 09:07 PM	#2
sharpi31 diyAudio Member Join Date: Oct 2005	Black Gate N 4.7uF 50V are great for signal coupling and PSU duties, and not too expensive....

12th November 2006, 11:37 PM	#3
Minion diyAudio Member Join Date: May 2006	You can also use good quality Metal Film or Mylar Caps which are Much smaller than Poly caps but offer simular performance and can be found for a fraction the price of Poly caps.... I recently picked up 100 0.1uF Metal Film caps for about $3..... Cheers

13th November 2006, 05:00 AM	#4
RogerGustavsson diyAudio Member Join Date: Aug 2004 Location: Huskvarna	Look for Wima MKS2 or Evox Rifa MMK. Both uses metallized polyester film (mylar). 4.7 µF/50V are 7.2x7.2x13 mm. Pitch is 5 mm. Wima can supply 6.8 and 10 µF too but with a lower voltage rating.

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