I would disagree that "protecting the external circuit referred to, and not the
cap.(?)" I still think it is to protect the cap :)
Still stand by my statement "I agree it can be done in some places just be
careful." I might change some places to many places though; you just need to
have an understanding of the circuitry connected to the cap and what the cap is
doing there.
There is allot if info out here in the web and here is another reference with a
chart of some CAPACITOR SPECIFICATIONS AND TRADE-OFFS, although it does not
mention the inrush or ripple current specs for Tantalum caps. Interesting
comment on Tantalum caps in audio circuits in there also.
http://www.intersil.com/data/an/an1325.pdf
Stuart had some good input in his email also.
73, Dennis N9TZL
----- Original Message -----
From: Roy <royanjoy@ncn.net>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Sent: Tue, 24 Jan 2012 11:51:25 -0600 (CST)
Subject: Re: [TenTec] swapping a tantalum...
Not to be a killjoy but: Personally I would be careful in the wholesale
replacement of electrolytics with Tantalum caps. Tantalum caps can not stand
the inrush current that electrolytics can which can cause the Tantalum cap
to fail. They require some series impedance from the voltage source to the
cap so as not to exceed the inrush current.
I agree it can be done in some places just be careful.
Couple of references!
http://en.wikipedia.org/wiki/Tantalum_capacitor
http://www.hitachiaic.com/docs/products/tantprecautions.pdf
73, Dennis N9TZL
Dennis,
I take the below statement to possibly pertain to protecting the external
circuit referred to, and not the cap.(?)
73, Roy K6XK
"Tantalum capacitors have a relatively low effective series resistance (ESR)
when compared to equivalent value aluminium electrolytic capacitors. Because
of this, care must be taken when designing a circuit using tantalum
capacitors to limit charge and discharge currents (particularly those of a
repetitive nature) to a safe value. "
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