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Old 6th January 2009, 11:30 PM   #11
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here too:
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Old 7th January 2009, 02:53 PM   #12
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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
Steven is offline Steven  Netherlands
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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.

The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973
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