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I have been using this kind of capacitor for tuning resonant coils.
The switch is a binary coded hexadecimal switch with 16 positions. It has four outputs and one common input. When soldering capacitors like indicated in the picture, the adjustment range is 0 - 7.5 nF in ~0.5nF steps.
The adjustment range and steps can be changed by altering the capacitor values. By doubling each value in the picture, the range is 0 - 15nF in ~1nF steps.
The switch contains just copper, so the parasitic parameters are negligible on frequencies the metal detectors usually operate.
The switch is a binary coded hexadecimal switch with 16 positions. It has four outputs and one common input. When soldering capacitors like indicated in the picture, the adjustment range is 0 - 7.5 nF in ~0.5nF steps.
The adjustment range and steps can be changed by altering the capacitor values. By doubling each value in the picture, the range is 0 - 15nF in ~1nF steps.
The switch contains just copper, so the parasitic parameters are negligible on frequencies the metal detectors usually operate.
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