Bypass capacitor placement

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Navyblue

Member
2012-03-22 8:37 am
For this:

MC7812_zpsd1b05c1d.png


Ideally, both the capacitor and the regulator has to be placed close together. However, I can not place the 10mF cap close to the regulator (with 3-4" of wire in between). So should I solder the 100nF cap to the pin of the 10mF cap or the pin of the regulator? Or do I want 2 caps at both locations?

And for this purpose, do I want ceramic cap or film cap? Most seem to recommend ceramic, but is it because of cost reason? Or ceramic has advantages over film (lower ESL?)?
 
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