Deutsch   English   Français   Italiano  
<vv7sie$1epp4$1@dont-email.me>

View for Bookmarking (what is this?)
Look up another Usenet article

Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: John R Walliker <jrwalliker@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Cap C-V test
Date: Sun, 4 May 2025 15:11:26 +0100
Organization: A noiseless patient Spider
Lines: 29
Message-ID: <vv7sie$1epp4$1@dont-email.me>
References: <sik71k9uvbqacp964bvlc5317ga12gu9al@4ax.com>
 <vv6bc3$lohn$1@dont-email.me> <loid1kl3cb3c0m0hi5dvno24q5vk545gof@4ax.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Sun, 04 May 2025 16:11:27 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="908031b3c195349a05358289dd02a955";
	logging-data="1533732"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX19nTIXTTAWLXNML+jNq4KFm0W15u8hvCKU="
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:8ytnawebiBLjXzwBM6G4cmLG0e8=
In-Reply-To: <loid1kl3cb3c0m0hi5dvno24q5vk545gof@4ax.com>
Content-Language: en-US

On 04/05/2025 03:17, john larkin wrote:
> On Sun, 4 May 2025 02:11:47 +0200, Lasse Langwadt <llc@fonz.dk> wrote:
> 
>> On 5/1/25 22:09, john larkin wrote:
>>>
>>> https://www.dropbox.com/scl/fi/a7425c69k3w8wx8tqjpq5/X110_CV_Test.jpg?rlkey=pc3c0b12ncswv6ajrn148stdk&raw=1
>>>
>>>
>>> The DUT is a Venkel 2.2 uF 100v 1812-size ceramic cap. I need to run
>>> it at 48 volts. 0.8 uF is probably OK. I have room on my board so I
>>> guess I'll add another cap in parallel.
>>
>> or in series, I believe there are some automotive standards that call
>> for that on high current lines because ceramics tend to fail short with
>> mechanical stress
>>
> 
> Two of those caps in series would make about half the capacitance of
> two in parallel, but ESR and ESL would suffer by 4:1.
> 
> We don't see many ceramic cap failures. Our worst parts are "sealed"
> relays that actually aren't. Some switches, too.
> 
> We don't use surface-mount film caps. They are awful.

Even the PPS type?

John