TROS — aircore “ferrite”

if primary coil works inside the coil it means there’s oscillation there too, so just placed a load coil inside and got lite too (it’s a low voltage oscillation, so the regular lightbulb will work too if to get higher power), but inserting any iron or ferrite material inside the load coil gets light brighter, means oscillation on ferrite (toroid and ferrite TROSes) more efficient

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