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Re: Capacitor rules

Cross-posted to 5 groups.

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On 2023-03-01, Daniel <me@sc1f1dan.com> wrote:
> Hi folks I'm really new with electronics. Doing a massive project for a
> retro computer system and, as a prong of this project I'm attempting to
> locate a modern equivalent of the board components. Enter the tantalum
> capacitor. Having gone to digikey, mouser, and newark none of them seem
> to have the item I'm looking for in stock.
>
> What are the rules about alternate values?

lower percentage good, higher voltage good. 
same or close capacitance good,
sometimes more capacitance is good.

> The tantalum cap I'm looking
> for, according to the service manual, has the following rating:
>
> 1uf,10v, +-20%. 
>
> The DIP style cap that the board uses isn't in stock anywhere so would I
> be able to substitute this cap for 1uf, 20v, +-20%?

DIP: I guessing you mean radial pins.

With tantalum going up in voltage leads to improved reliability
if this is a 5V or 8V supply decoupling capacitor the 20V part is much
better suited.

On the other hand inexpensive 1uF ceramic capacitors are now available 
and might be an even better substitute (even better reliability), but
that depends mostly on the power supply being able to start with the 
reduced series resistance presented by the ceramic parts.

-- 
 Jasen.
 pǝsɹǝʌǝɹ sʇɥƃᴉɹ ll∀

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Capacitor rules Daniel <me@sc1f1dan.com> - 2023-03-01 14:06 +0000
  Re: Capacitor rules Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2023-03-01 09:33 -0500
    Re: Capacitor rules Daniel <me@sc1f1dan.com> - 2024-06-19 07:32 +0000
      Re: Capacitor rules Daniel70 <daniel47@nomail.afraid.org> - 2024-06-19 23:38 +1000
        Re: Capacitor rules Daniel <me@sc1f1dan.com> - 2024-06-26 02:11 -0700
          Re: Capacitor rules Daniel70 <daniel47@nomail.afraid.org> - 2024-06-26 22:57 +1000
      Re: Capacitor rules vjp2.at@at.BioStrategist.dot.dot.com - 2024-07-06 04:32 +0000
        Re: Capacitor rules John Robertson <jrr@flippers.com> - 2024-07-07 23:44 -0700
          Re: Capacitor rules Daniel70 <daniel47@nomail.afraid.org> - 2024-08-05 20:29 +1000
  Re: Capacitor rules Jasen Betts <usenet@revmaps.no-ip.org> - 2023-03-02 00:17 +0000
    Re: Capacitor rules Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2023-03-01 19:54 -0500
      Re: Capacitor rules Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2023-03-01 19:56 -0500
  Re: Capacitor rules chuck <donnyduck@gmail.com> - 2023-03-13 10:28 -0400

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