Posted by **Dingleberry** on Sunday, September 23, 2012 at 4:43am.

A friend working on a psychology experiment asks you for help with the design of a simple circuit. She needs an LC timing circuit in which the voltage on a fully charged capacitor drops to zero in 15s . She has a 20H inductor available, but doesn't know what value of capacitor to use. What do you recommend?

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