If you thought that capacitor orientation only matters for polarized varieties like electrolytic capacitors you should read one article to make you change your mind. In PCB Layout Tricks—striped capacitors and more article Bruce Trump looks at why some film capacitors have a stripe printed on one end and why their orientation can matter. Careful placement and orientation may yield noticeable improvement in sensitive circuits.
3 Comments
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Tomi Engdahl says:
Orange Drops: Busting Tone Control Capacitor Myths
http://www.electronicproducts.com/Analog_Mixed_Signal_ICs/Sensors/Orange_Drops_Busting_Tone_Control_Capacitor_Myths.aspx#.U5rJCShsUik
Tomi Engdahl says:
How To Tell If You’re Installing Foil Capacitors Backwards
http://hackaday.com/2015/05/20/how-to-tell-if-youre-installing-foil-capacitors-backwards/
It only takes one mistake to realize electrolytic capacitors have a polarity, but if you’re working with old tube gear, tube amps, or any old equipment with those old orange dip, brown dip, or green dip foil capacitors you also have to watch your polarity. These old caps were constructed with a foil shielding, and there’s always one side of these caps that should always be connected to the chassis ground. If you don’t, you’re going to get interference – not something you want in an amplifier circuit.
Old caps that have long since given up the ghost usually have a black band designating whatever side of the cap the ‘foil ground’ is. This is the side that should be connected to ground.
To properly test foil caps and determine which side should be closer to ground, you can construct a small tester