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DIY Crowbar OVM

 
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cluros(at)gmail.com
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PostPosted: Wed Jan 16, 2019 11:55 am    Post subject: DIY Crowbar OVM Reply with quote

A couple years ago I ordered the parts to make an OVM for my friends aircraft. We finally got around to breadboarding it this week and we have a part left over: A 5 ohm 5 watt resistor, see picture below. Anyone want to guess what use this would be in an aircraft? Maybe I ordered it for a panel dimmer circuit or something?

Also, my 0.1uF/250V capacitor https://www.digikey.ca/products/en?keywords=p10967 does not have polarity markings that I can find. The diagram shows a polarized cap. Is this just in case? If I can't find markings on my cap am I safe disregarding polarity?
Thank you,
Sebastien


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cluros(at)gmail.com
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PostPosted: Wed Jan 16, 2019 12:03 pm    Post subject: DIY Crowbar OVM Reply with quote

Whoops. Picture attached.

On Wed, Jan 16, 2019 at 11:59 AM Sebastien <cluros(at)gmail.com (cluros(at)gmail.com)> wrote:

Quote:
A couple years ago I ordered the parts to make an OVM for my friends aircraft. We finally got around to breadboarding it this week and we have a part left over: A 5 ohm 5 watt resistor, see picture below. Anyone want to guess what use this would be in an aircraft? Maybe I ordered it for a panel dimmer circuit or something?

Also, my 0.1uF/250V capacitor https://www.digikey.ca/products/en?keywords=p10967 does not have polarity markings that I can find. The diagram shows a polarized cap. Is this just in case? If I can't find markings on my cap am I safe disregarding polarity?
Thank you,
Sebastien


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bobnoffs



Joined: 04 Jul 2012
Posts: 99
Location: northern wi.

PostPosted: Wed Jan 16, 2019 1:32 pm    Post subject: DIY Crowbar OVM Reply with quote

no 

On Wed, Jan 16, 2019 at 2:13 PM Sebastien <cluros(at)gmail.com (cluros(at)gmail.com)> wrote:

Quote:
Whoops. Picture attached.

On Wed, Jan 16, 2019 at 11:59 AM Sebastien <cluros(at)gmail.com (cluros(at)gmail.com)> wrote:

Quote:
A couple years ago I ordered the parts to make an OVM for my friends aircraft. We finally got around to breadboarding it this week and we have a part left over: A 5 ohm 5 watt resistor, see picture below. Anyone want to guess what use this would be in an aircraft? Maybe I ordered it for a panel dimmer circuit or something?

Also, my 0.1uF/250V capacitor https://www.digikey.ca/products/en?keywords=p10967 does not have polarity markings that I can find. The diagram shows a polarized cap. Is this just in case? If I can't find markings on my cap am I safe disregarding polarity?
Thank you,
Sebastien



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Eric Page



Joined: 15 Feb 2017
Posts: 118

PostPosted: Wed Jan 16, 2019 6:20 pm    Post subject: Re: DIY Crowbar OVM Reply with quote

Sebastien,

Your capacitor is non-polarized; its orientation doesn't matter.

Eric


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