CDs useful for winding a toroidal coil?

At your risk.


A compact disk, in fact 2 of them were seen lying on the street. Most of the label had been wiped off by the adverse conditions.


So these CDs looked like opaque disks with a hole in the center.


Is this a nice toroid (ring) core for winding air wound mductors?


The only problem is that for microphone low cut filtering, many many turns of wire would have to be wound which can be very tedious or even a relaxing exercise. We are talking thousands of turns unless the mic is of very low impedance.


So a Pleiades (R,L) gentle slope filter with hum bucking properties is possible. R can come from the wire resistance itself. Then the coil connected across the microphone output terminals.