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Old 6th January 2009, 11:30 PM   #11
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here too:
http://www.alliedelec.com/Search/Pro...=CB052E0105JBC
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Old 7th January 2009, 02:53 PM   #12
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Quote:
1uF cap resonant at 2 MHz , so L = 1 / (1e-6)(6.28 * 2e6)^2 L = 6.3 nH
Oops, another faux-pas. The equation used 1 MHz, but I wrote in 2 MHz. Change it, and all is good in the world.

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Old 8th January 2009, 09:28 PM   #13
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Quote:
Originally posted by Pafi

...
I even heard it. It plays speaker. (And microphone, when its on the input.)
...
X7R capacitors can be very microphonic. Some 20 years ago I was not aware of that when I started to use SMD components. I had a preamplifier PCB that doubled as microphone. When it was connected, I could just talk to the PCB and my voice was clearly audible from the loudspeaker. No need to connect a real microphone to it. Since then I never used these capacitors again as coupling capacitor, even in non-critical applications. At that time there were hardly other capacitors in SMD than ceramic ones, so I had to use through hole foil capacitors.

Steven
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