You know the frequency range of your signal source. That's a constant.
You know the equation for the resonant frequency (1/(2*pi*sqrt(LC)) so build up a spreadsheet.
Pick an L, you have the frequency range, calculate a lower and upper limit for C based on that range (or some percentage of the range). Pick a C, calculate an upper and lower limit for L.
Ordinarily, things like volts/division on a scope are selected in a 1-2-5 (10-20-50) arrangement of values. I prefer neat numbers like 1 uF, 10 uF, 100 mH, etc.
Remember, in the equation, L is in Henrys and C is in Farads. Frequency is in Hz. I wouldn't go too low in Hz because it will be hard to see on a scope. 1 Hz would be truly grim. I might stay at or above 1 kHz. I guess it would depend on what the spreadsheet turned up.
Richard
Posted by: rstofer@pacbell.net
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