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  • The Ultimate FM Transmitter  (Long Range Spybug)

    Your schematics says that the inductor's inductance = .1uHBy winding an AWG18 (1mm thick) copper wire 7-8 times around a 1/4" (6mm) bolt we would theoretically get an inductor with the inductance of 0.25-0.29uH and not .1uH as recommended by your schematics. Check yourself: http://rimstar.org/science_electronics_projects/coil_design_inductance.htm.This is a big issue because the LC resonant frequency would vary between 47-225MHz which is outside the desired 87-108MHz freq. interval. Check yourself: http://www.daycounter.com/Calculators/LC-Resonance-Calculator.phtml.Am I missing something?

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