Tweet
some more strange things...
going back to two disks, and one spiral coil with turn spacing equal to wire dia. I did some measurements.
2" copper disks
2" 24ga copper pancake coil
oil/vellum paper dielectric
12VAC,
each leg of coil one diode 1n34007, 10Meg ohm resistor and a 1.5uF 250v cap.
voltage measured : with no ground ~2.5VDC; with ground lead ~6.5VDC
coil ends, no diodes , no ground and shunted to 10meg Ohm R: ~4.5VAC,
when charging a capacitor there is zero measured current on the plate supply power.
now for the interesting bit, taking the AC transformer and holding it near the power cable drop,( I have a corded drop from the ceiling for power) the coil picks up this and puts out a voltage signal, looping the PS cable around the power cable also increases this effect, not too strange as this is 'inductive' pickup. It's highly sensitive though, esp to near body capacitance.
the ability to charge a capacitor and yet not measure a current draw is the strange part. it's highly sensitive, picks up and amplifies mutual inductance greatly.
been working on the calcs, so far the closer agreement is calculating a mutal charge field and not a magnetic field. need to brush up on my vector calculus some more and look a bit deeper into electrostatics.
going back to two disks, and one spiral coil with turn spacing equal to wire dia. I did some measurements.
2" copper disks
2" 24ga copper pancake coil
oil/vellum paper dielectric
12VAC,
each leg of coil one diode 1n34007, 10Meg ohm resistor and a 1.5uF 250v cap.
voltage measured : with no ground ~2.5VDC; with ground lead ~6.5VDC
coil ends, no diodes , no ground and shunted to 10meg Ohm R: ~4.5VAC,
when charging a capacitor there is zero measured current on the plate supply power.
now for the interesting bit, taking the AC transformer and holding it near the power cable drop,( I have a corded drop from the ceiling for power) the coil picks up this and puts out a voltage signal, looping the PS cable around the power cable also increases this effect, not too strange as this is 'inductive' pickup. It's highly sensitive though, esp to near body capacitance.
the ability to charge a capacitor and yet not measure a current draw is the strange part. it's highly sensitive, picks up and amplifies mutual inductance greatly.
been working on the calcs, so far the closer agreement is calculating a mutal charge field and not a magnetic field. need to brush up on my vector calculus some more and look a bit deeper into electrostatics.
Comment