[sdiy] Sallen Key caps

[Roman Sowa]

Yes, NO0s don't suffer the bad things like regular ceramics. Good 
tempco, no DS bias dependency, and low dissipation.

if you're aiming for 1206, then it's easier to find 100nF like this:
http://uk.farnell.com/murata/grm31c5c1e104ja01l/cap-mlcc-c0g-np0-100nf-25v-1206/dp/8820210

and no need to R change then

Roman


W dniu 2015-04-24 o 16:45, Justin Owen pisze:
> Thanks all....
>
> So something like this COG/NPO Ceramic in 1206 at 10nF:
>
> http://uk.farnell.com/murata/grm3195c1h103ja01d/cap-mlcc-c0g-np0-10nf-50v-1206/dp/8820155
>
> ...would be a suitable replacement for this guy (with the corresponding R value adjustments):
>
> http://uk.farnell.com/kemet/r82dc3100dq50k/cap-film-pet-0-1uf-63v-rad/dp/2429344?ost=242-9344
>
> Cheers,
>
> - Justin
>
>
>
> -----Original Message-----
> From: Richie Burnett [rburnett at richieburnett.co.uk]
> Received: 23.04.2015 19:20:45
> To: SDIY List; Justin Owen
> Subject: Re: [sdiy] Sallen Key caps
>
> Since they're plastic film capacitors you have to be careful not to overheat
> them and damage the plastic during soldering.  Ceramic surface mount chip
> capacitors are more forgiving.
>
> 100nF is quite a large value.  I'm guessing your resistors are around the 3k
> region for a 500Hz cutoff.  Perhaps you could afford to make the resistances
> in your SKF a few times larger, and use correspondingly smaller capacitors?
>
> -Richie,
>
>
> -----Original Message-----
> From: Justin Owen
> Sent: Thursday, April 23, 2015 4:59 PM
> To: SDIY List
> Subject: [sdiy] Sallen Key caps
>
> Hello,
>
> I'm using a Sallen Key LPF as a DAC output reconstruction filter with cutoff
> set at approx. 500Hz.
>
> I've been using these PET through-hole caps:
>
> http://uk.farnell.com/kemet/r82dc3100dq50k/cap-film-pet-0-1uf-63v-rad/dp/2429344?ost=242-9344
>
> Filter works as expected - but I was wondering if these PEN 1210 SMD might
> be a viable space-saving alternative?
>
> http://uk.farnell.com/avx/cb027c0104jba/cap-film-pen-100nf-25v-smd/dp/1100602
>
> Haven't used a cap like this in surface mount before - so any info would be
> appreciated.
>
> Thanks,
>
> - J
>
>
>
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