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 Forum index » DIY Hardware and Software
Ceramic Capacitor details
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Ayab



Joined: Oct 27, 2015
Posts: 35
Location: London, UK

PostPosted: Fri Jan 08, 2016 2:58 pm    Post subject: Ceramic Capacitor details
Subject description: Ceramic Capacitor's for Ian Fritz modules
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Hi There Folks

I am looking to build some Ian Fritz designs from pcb's and have downloaded the parts lists from Elby designs.

I want to use source the parts myself (and use some I have already where possible) but am a little unsure about the details (in bold) of some of the ceramic capacitors listed:

The 5 Pulser bom lists:

10pF 5% Ceramic, NPO
56pF 5% Ceramic, Low K


The Chaotica bom lists:
100pF 5% Ceramic C0G

Is it essential to specify "NPO, Low or COG". Some googling has not made me much wiser. Embarassed I am sure they are detailed for good reason but can I get away with normal ceramic or mcc?

Also can I substitute polystyrene for Mylar with these IF designs? I know some people here do with other designs - are there any rules of thumb on these things.

Obviously I would not want to jeopardise a module operating properly for the sake of a few components but overall the costs do build up considerably. I have been putting a lot of time into learning about all this from scratch but I feel that I am hitting a bit of an obstacle Rolling Eyes . Please help.

Best wishes to all for 2016

Last edited by Ayab on Fri Jan 08, 2016 4:17 pm; edited 1 time in total
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thermionicjunky



Joined: Dec 07, 2006
Posts: 82
Location: san francisco

PostPosted: Fri Jan 08, 2016 3:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

The 0 in C0G and NP0 is a zero. It's a very stable ceramic. You could use silver mica for the 10pf, but I would not use a regular ceramic.

Polystyrene is a very stable film cap. It may be overkill, and they are heat-sensitive (easy to damage), but it will work very well. Polypropylene is somewhere between polystyrene and polyester(mylar) in general quality.
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Ayab



Joined: Oct 27, 2015
Posts: 35
Location: London, UK

PostPosted: Fri Jan 08, 2016 5:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Thermionic

Really appreciate the wisdom and will take your advice and stick to the spec.

Cool
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Ayab



Joined: Oct 27, 2015
Posts: 35
Location: London, UK

PostPosted: Fri Jan 08, 2016 8:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

What about "Low K"?

Will I get away with a cheapo multilayered ceramic?
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thermionicjunky



Joined: Dec 07, 2006
Posts: 82
Location: san francisco

PostPosted: Sat Jan 09, 2016 10:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Ayab wrote:
What about "Low K"?

Will I get away with a cheapo multilayered ceramic?


It seems like the easiest way to find low-K is to search for NP0 or C0G. Low-K may also be referred to as Class 1. Other common ceramics will likely have mid-to-high-K.
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Ayab



Joined: Oct 27, 2015
Posts: 35
Location: London, UK

PostPosted: Sat Jan 09, 2016 1:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi thermionicjunky

Ok, ok Wink

Hope you are having a good weekend.
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