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I don't think it will work. When a switch is open, the related FET gates are "floating" at an indeterminate voltage. I don't think you can guarantee that they will all turn off.
There may be other problems but I didn't bother to look further than this.
Thanks and apologies for omitting to mention that I don't need accuracy. Also, I'm trying not to spend any money if I can avoid it, so I'd like to use what I have available (enamelled copper wire, wood, nails and plenty of general purpose electronic components). I'd like to achieve resonance if...
I want to construct a coil of enamelled copper wire to use as an "antenna" to pick up the 50 Hz radiation from 220 volt power cables buried under 2 inches of plaster and close to steel reinforcing rods in concrete.
With so much metal around I can't use the usual heterodyne methods so I plan to...
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