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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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20th Oct 2018, 11:44 am
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#21 |
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Equipment for detecting capacitor's outer foil.
Amp. plus thumb and forefinger, no dedicated test equipment needed.
Lawrence. Last edited by ms660; 20th Oct 2018 at 11:53 am. |
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20th Oct 2018, 2:22 pm
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#22 |
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Hexode
Join Date: May 2009
Location: Newcastle, Australia
Posts: 319
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Re: Equipment for detecting capacitor's outer foil.
Another easy method.
Broadcast receiver valve job (why not??). Disconnect the antenna wire from the antenna lead and connect it to one end of your capacitor. Crank up the volume on the radio and tune it to between stations. Grip the capacitor on the sides of it and compare the noise from the radio with different ends of the capacitor connected to the antenna lead. The one making the loudest noise is connected to the outer of the capacitor. You get the idea. Same thing that Lawrence just said using a radio instead of an audio amp. Cheers, Robert. |
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20th Oct 2018, 2:44 pm
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#23 |
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Rest in Peace
Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
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Re: Equipment for detecting capacitor's outer foil.
Might not work with a radio unless the capacitor is quite low value. Most of these checks rely on stray capacitance alone being noticeably higher in value than 'stray+capacitor value in series'.
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20th Oct 2018, 2:51 pm
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#24 |
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Equipment for detecting capacitor's outer foil.
Just to be clear with my suggestion, the capacitor is connected across the two input terminals/whatever.
I didn't explain the procedure as it should be self evident. Lawrence. |
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