(Topic ID: 243219)

Another Capacitor Question

By mstire

33 days ago

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  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 33 days ago by G-P-E
  • Topic is favorited by 1 Pinsider


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cap (resized).jpg

#1 33 days ago

I'm replacing the original caps on my GP Sharpshooter II sound board

Can someone tell me which is the negative side of this 220 mf cap. All of the other caps are crimped on the positive side or have some kind of marking to show the negative side but this one is crimped on both ends.

There are no markings on the capacitor itself and no indication on the board

cap (resized).jpg
#2 33 days ago

The 220uF on your sound board is a bidirectional or bipolar cap, the Richey cap is a standard,unidirectional cap. Axial bipolar caps are getting hard to find as more and more manufacturers discontinue axial style caps.
You need to get a 220uF bidirectional cap for that one if your sound board is using a bipolar (both plus and minus supplies in addition to ground). You can use a standard cap if there is only one supply. If only one supply, you need to figure out from the schematics - which end is in reference to ground. BUT -- standard caps of this size are not really intended for sound applications, really best to try to locate a bipolar of this size.


#3 33 days ago

If you can find one -- Illinois Capacitor has one in their BPA series: 227BPA025M

#4 33 days ago

should be able to use two 470uF polar if you put them in series + - - + (pos neg neg pos)

#5 33 days ago

You can also use a 220uF radial bipolar.
Something like this one:

Using two axials in series does work but sometimes not real good in an audio circuit. This tends to add a bit of inductance to the mix which affects frequency response.

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