GDO scheme



The oscillator for this Dip meter is based on Alan N1AL article: "A modern GDO - THe "Gate" Dip Oscillator".
NOTE: to make this GDO more sensitive for "dip" while at resonance with a measured circuit a parallel to the coil resistor was added. I used the following method: firstly I set the lowest frequency with this particular coil then parallel to the coil a trimmer was added and the resistance of the trimer was decreased up to the moment when the generator stops its oscillation. Then increase slightly resistance - check oscillations for all frequency range with this coil. Replace the trimmer with a solid resistor.

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