{Collins} Re: Tantalums vs. Standard Caps



I agree.
You need to over spec on the voltage. Over 30 years ago I was building 
specialized test equipment at 3M for evaluating video recorders and video 
tape. We designed & ran all the test equipment on either 12 or 15 volts, and 
always used 35 or 50 volt tantalums on every circuit board. I never had one 
go bad ( except for the ones I mounted backwards). I still have some boards 
from that time period that are still in operation, for other purposes, with 
the original tantalums installed & still working just fine.

Bruce  K0SON

----- Original Message ----- 
From: "Danny J. Conner" <djconner@xxxxxxxxxxx>
To: <w4nj@xxxxxxxxxxxxxxx>; <collins@xxxxxxxxxxxxx>
Sent: Thursday, June 14, 2007 5:39 PM
Subject: {Collins} Re: Tantalums vs. Standard Caps


> Hi guys,
>
> Tantalum Capacitors have better tolerances than standard electrolytic
> capacitors.  The problem with tantalum capacitors is they don't like 
> Voltage
> spikes such as the ones you see when powering up a piece of equipment.
> Putting a 16 volt tantalum in a 12 volt circuit means you're going to
> eventually have a failure.  If we used a 35 Volt capacitor in the same
> circuit, you would not need to worry about a failure.  When I need to
> replace tantalum capacitors, I replace them with tantalum capacitors rated
> at a higher voltage rating.  My Harris RT 1446 units were notorious for
> blowing tantalums - I've never had to replace one more than once.
>
> 73,
>
> Danny
> W4MI
>
>
>
> -----Original Message-----
> From: collins-bounce@xxxxxxxxxxxxxxxxxxxxx
> [mailto:collins-bounce@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of
> w4nj@xxxxxxxxxxxxxxx
> Sent: Thursday, June 14, 2007 3:38 PM
> To: collins@xxxxxxxxxxxxx
> Subject: {Collins} Tantalums vs. Standard Caps
>
> Hello CCA Friends and the List,
>
>   Thank you to all who have responded so quickly to my Tantalums
> inquiry. Many have suggested abandoning completely the dreaded Tantalums
> and replacing them with standard caps. Opinions please to this suggestion?
>
> 73,
>
> Cliff Crane - W4NJ
> .
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      http://www.collinsradio.org/html/membership.html    -paypal accepted-
.
 NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
  SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
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