I've been discussing specifics of an electrical job with a licensed electrician and he mentioned that in my area, it's acceptable/recommended to feed 12 gauge NM wire through an outdoor conduit but that the PVC sheathing SHOULD be removed if the wiring is going to travel through more than 6 feet of conduit.   This doesn't make sense to me. How/why would that be better than keeping sheathing on through the conduit run? Condensation?
If I have NM cable running into a junction box, can I strip the sheath of the NM cable starting inside the junction box and run the conductors without a sheath through conduit that is connected to the junction box? I understand that the wiring you'd typically use through conduit is THHN or NM (if you want to use the conduit solely as protection).  But I'd like to be able to take this incoming NM cable and have it's conductors only continue on through conduit along with some other THHN that's coming from another source. The individual conductors of the NM cable while not labeled can still be traced back to where the sheathing ends, so technically the conductors are still identifiable as to what they are. If need be, I could splice the NM conductors to THHN wire in the junction box, but I don't see a reason to add a splice where I don't think it's needed. My reasoning for why I think this should be OK is that if you terminate NM cable in a panel, you typically have a foot or so of the conductors without the sheath and there's nothing identifying those other than tracing it back to the sheath it came from.
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Digitally selectable filter I have asked a  but I did not get an answer, as it was too specific. So I will build on it but make it a bit more broad spectrum.  I would like to make a digitally selectable BPF using transistors to select a component in the filter; resulting in the center frequency being changed.  I have used FilterPro to generate quick second order filters and get a rough filter response.  For all the designs, a Multiple-feedback was selected:  In the first picture, a center frequency at 108KHz with a bandwidth @ -3dB of 103K to 113KHz is given.    For the second, a center frequency at 117.5KHz with a bandwidth @ -3dB of 112.8K to 122.2KHz is given.    The only difference between these two circuits is R3.  If I were to implement a circuit as shown below, would it work and what transistor would be recommended? I have selected the  as the Opamp in the circuit design as that is what was used for the .    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