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 Post subject: Are polarized and non polarized capacitors interchangeable
PostPosted: Sep Wed 22, 2021 11:50 pm 
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Joined: Jan Thu 07, 2021 10:41 am
Posts: 132
I need an axial 100uF electrolytic capacitor to replace C140 but none available locally. I do have a number of 100uF non polarized crossover capacitors. Can I use those as a substitute.


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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 12:48 am 
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Joined: Jan Sat 25, 2020 5:23 am
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Location: Colorado Springs, CO 80917
Generally, a nonpolar cap can be used where a polar (electrolytic) was originally. But you have to make sure that crossover cap has sufficient voltage rating.


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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 1:00 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 18684
Location: Mountains of Mourne. Ireland.
Are you in the Boonies?
100µF (microfarad) is a commonly found value.


As mentioned, you can replace a regular polarized electrolytic capacitor with an NP (non-polarized) capacitor - - - never the other way round.

You can "make" an axial capacitor from a radial.
viewtopic.php?p=3386575#p3386575

The WVDC (working voltage) of a capacitor is how much "juice" that it can handle.
This can be increased.

Greg.


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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 1:17 am 
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Joined: Jan Thu 07, 2021 10:41 am
Posts: 132
egg wrote:
Are you in the Boonies?
100µF (microfarad) is a commonly found value.


As mentioned, you can replace a regular polarized electrolytic capacitor with an NP (non-polarized) capacitor - - - never the other way round.

You can "make" an axial capacitor from a radial.
viewtopic.php?p=3386575#p3386575

The WVDC (working voltage) of a capacitor is how much "juice" that it can handle.
This can be increased.

Greg.

Very common here too but not axial. Thanks for the link, that may be the best solution. I need long leads but I can “extend”.
Problem atm in Australia is lockdown and postage times. I was just looking for a solution that would allow me to continue my restoration and not wait for parts.


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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 2:13 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 39559
Location: SoCal, 91387
The circuit doesn't care about the lead configuration, only the capacitance value and working voltage limit. I commonly use radials that I have on hand when recapping what were always axial caps.

Here's a Sonora sporting my exquisite craftsmanship :wink: , where the black filter caps are radials, non polarized ones are them little yella fellas...


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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 12:35 pm 
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Location: Sunbury, Ohio 43074
Quote:
Here's a Sonora sporting my exquisite craftsmanship :wink:

I think I see a wire or two that are not perfectly straight, parallel, or make 90 degree bends......

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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 12:37 pm 
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Joined: Aug Thu 26, 2021 8:07 am
Posts: 102
Location: Ukraine
Barry H Bennett wrote:
I think I see a wire or two that are not perfectly straight, parallel, or make 90 degree bends......


This is a divine curve with a variable compensation component)

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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 2:57 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13485
Location: Fernandina Beach, FL
US7IGN wrote:
Barry H Bennett wrote:
I think I see a wire or two that are not perfectly straight, parallel, or make 90 degree bends......


This is a divine curve with a variable compensation component)

Providing better sonic qualities...

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Don


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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 3:28 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3931
Location: Boston, Massachusetts
kevwr wrote:
egg wrote:
Are you in the Boonies?
100µF (microfarad) is a commonly found value.


As mentioned, you can replace a regular polarized electrolytic capacitor with an NP (non-polarized) capacitor - - - never the other way round.

You can "make" an axial capacitor from a radial.
https://www.antiqueradios.com/forums/vi ... 5#p3386575

The WVDC (working voltage) of a capacitor is how much "juice" that it can handle.
This can be increased.

Greg.

Very common here too but not axial. Thanks for the link, that may be the best solution. I need long leads but I can “extend”.
Problem atm in Australia is lockdown and postage times. I was just looking for a solution that would allow me to continue my restoration and not wait for parts.


Australia is in lockdown? Just ordered some clock parts from Jonathan Knowles in NSW, and it arrived in the US within a week.
Carls Capacitors
https://www.ebay.com.au/sch/i.html?_dmd ... _nkw=100uf

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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Thu 23, 2021 4:08 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13485
Location: Fernandina Beach, FL
mrx wrote:
...
Australia is in lockdown? ...
That is an understatement! My daughter and family live in Victoria. What a mess...

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Don


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 Post subject: Re: Are polarized and non polarized capacitors interchangeab
PostPosted: Sep Sat 25, 2021 3:30 am 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 11151
Location: Long Island NY
Using a non-polarized electrolytic in place of a polarized one is something many people do in a pinch, but it is not really a recommended practice. Aside from the fact that you are using a more expensive capacitor to replace a cheaper one but not gaining any advantage, non-polarized electrolytics are usually higher in ESR than their polarized counterparts. In some circuits higher ESR can be detrimental, though it is doubtful that you would notice any difference in this case.

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