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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 3 Jun 1999 13:04:20 -0700 |
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I think I've seen every type of polar component mis-marked of the years
- keeps you on your toes. Seems to me I remember something about the
smoke from fried tantalums being toxic so it might be prudent to add
ventilation to the safety precautions.
>-----Original Message-----
>From: Raymond Klein [SMTP:[log in to unmask]]
>Sent: Thursday, June 03, 1999 12:45 PM
>To: [log in to unmask]
>Subject: Re: [TN] Tantalum caps and the big bang
>
>Ron,
>
>In the past 20 or so years I've seen about 6 lots of tant caps the were
>polarity mis-labeled. They get quite hot and pop. One even smoked a trace
>on the PWB. (My fault for making it too thin).
>
>You can test caps by putting them directly across a DC supply at 1/2 the
>rated voltage. The supply should be able to supply at least 1 amp. If the
>cap gets hot in a few seconds its "+" lead (what ever its marking) is
>connected to the "-" lead of the power supply. Wear safety goggles as com
>caps can fail spectacularly. Also be careful touching them as they can
>raise a blister.
>
>Good luck - Ray Klein
>
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