Hello. I recently built a 500kHz oscillator with a high L and very low C. Part of the capacitor is constituted by a plate left alone (without its counterpart to ground) in free space, such that all surrounding conductive objects constitute "the ground plate".
During my experiments, I put conductors and isolators near the plate; of course I obtained variations in frequency proportional to the distance and shape of conductors, but I noticed that a tiny change in frequency also happened when I moved very close isolators, like PVC and PET pipes (long enough not to be myself, the conductor to influence frequency). I have not a ceramic or glass bar long enough to test it. I am curiuos if the effect could be due to the change in dielectric constant between air and the pipe material, or the pipe itself that, despite being clean, is not a so good insulator, even at low voltage (about 10V) and moderately low frequency. Best regards, Andrea Baldoni _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.
