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Re: bipolar aluminum caps

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"Tim Wescott" <tim@seemywebsite.really> wrote in message 
news:ybmdnZ2Ne9JZtJ3FnZ2dnUU7-QGdnZ2d@giganews.com...
> Since the circuit in question had DC paths to ground on both sides of the
> cap, we replaced it with a pair of back-to-back tantalums with the far
> side biased through a high resistance to some negative voltage (probably
> -12V) that was already on the board.  It worked pretty good for a panic-
> driven kludge.
>
> Sumpin' to think about.

An excellently valid solution, and note that tantalums are precise enough 
(~10%) to avoid the problem mentioned a few posts above (reversal for 
mismatched caps in series).

Electrolytic caps (chemically speaking, this includes wet and dry tants) are 
basically semiconductor* junction diodes with a fuckoff huge junction area. 
Reverse bias is a natural win for them!

*All insulators are semiconductors, to a sufficient definition of "semi". 
:-)

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com 

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bipolar aluminum caps John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 07:01 -0700
  Re: bipolar aluminum caps George Herold <gherold@teachspin.com> - 2016-10-13 07:11 -0700
    Re: bipolar aluminum caps Robert Baer <robertbaer@localnet.com> - 2016-10-15 00:38 -0800
  Re: bipolar aluminum caps tabbypurr@gmail.com - 2016-10-13 07:34 -0700
    Re: bipolar aluminum caps Reinhardt Behm <rbehm@hushmail.com> - 2016-10-13 22:58 +0800
    Re: bipolar aluminum caps John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 08:44 -0700
      Re: bipolar aluminum caps tabbypurr@gmail.com - 2016-10-13 08:59 -0700
        Re: bipolar aluminum caps George Herold <gherold@teachspin.com> - 2016-10-13 09:14 -0700
          Re: bipolar aluminum caps "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-10-14 03:40 -0500
            Re: bipolar aluminum caps Syd Rumpo <usenet@nononono.co.uk> - 2016-10-14 09:52 +0100
              Re: bipolar aluminum caps "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-10-14 03:59 -0500
                Re: bipolar aluminum caps Syd Rumpo <usenet@nononono.co.uk> - 2016-10-14 11:01 +0100
                Re: bipolar aluminum caps "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-10-14 21:48 -0500
              Re: bipolar aluminum caps tabbypurr@gmail.com - 2016-10-14 02:18 -0700
      Re: bipolar aluminum caps Robert Baer <robertbaer@localnet.com> - 2016-10-15 00:45 -0800
        Re: bipolar aluminum caps krw <krw@nowhere.com> - 2016-10-15 11:06 -0400
          Re: bipolar aluminum caps tabbypurr@gmail.com - 2016-10-15 08:23 -0700
            Re: bipolar aluminum caps krw <krw@nowhere.com> - 2016-10-15 19:39 -0400
        Re: bipolar aluminum caps Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2016-10-18 21:23 -0400
    Re: bipolar aluminum caps Robert Baer <robertbaer@localnet.com> - 2016-10-15 00:42 -0800
      Re: bipolar aluminum caps krw <krw@nowhere.com> - 2016-10-15 11:07 -0400
        Re: bipolar aluminum caps Robert Baer <robertbaer@localnet.com> - 2016-10-17 09:28 -0800
          Re: bipolar aluminum caps krw <krw@nowhere.com> - 2016-10-17 19:52 -0400
            Re: bipolar aluminum caps John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-17 17:29 -0700
            Re: bipolar aluminum caps Robert Baer <robertbaer@localnet.com> - 2016-10-19 13:06 -0800
  Re: bipolar aluminum caps Joerg <news@analogconsultants.com> - 2016-10-13 09:14 -0700
  Re: bipolar aluminum caps Frank Miles <fpm@u.washington.edu> - 2016-10-13 17:15 +0000
    Re: bipolar aluminum caps John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 11:42 -0700
      Re: bipolar aluminum caps Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2016-10-13 14:52 -0400
        Re: bipolar aluminum caps John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 11:56 -0700
        Re: bipolar aluminum caps "David Eather" <eather@tpg.com.au> - 2016-10-15 14:53 +1000
    Re: bipolar aluminum caps "David Eather" <eather@tpg.com.au> - 2016-10-15 14:52 +1000
  Re: bipolar aluminum caps Tim Wescott <tim@seemywebsite.really> - 2016-10-13 19:41 -0500
    Re: bipolar aluminum caps "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-10-14 03:43 -0500
      Re: bipolar aluminum caps Tim Wescott <seemywebsite@myfooter.really> - 2016-10-14 12:19 -0500
        Re: bipolar aluminum caps "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-10-14 22:18 -0500
  Re: bipolar aluminum caps krw <krw@nowhere.com> - 2016-10-13 20:57 -0400
    Re: bipolar aluminum caps John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 18:05 -0700
      Re: bipolar aluminum caps krw <krw@nowhere.com> - 2016-10-13 21:39 -0400
        Re: bipolar aluminum caps "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-10-14 03:44 -0500
          Re: bipolar aluminum caps whit3rd <whit3rd@gmail.com> - 2016-10-14 12:22 -0700
  Re: bipolar aluminum caps whit3rd <whit3rd@gmail.com> - 2016-10-13 18:01 -0700
  Re: bipolar aluminum caps alpibucky <alpibucky@mail.be> - 2016-10-14 22:23 +0200
  Re: bipolar aluminum caps Robert Baer <robertbaer@localnet.com> - 2016-10-15 00:35 -0800
    Re: bipolar aluminum caps Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2016-10-18 21:22 -0400

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