Current amplifier.
Here I'm oscillating the ferrite rod magnet piston off a 50 milliwatt inductive backspike from a "Reed Switch Spinner". The 75mH series connected ferrite core bifilar coil is in series with a 70uF 25 volt electrolytic capacitor for a resonant LC tank frequency of 70 Hertz.
https://www.youtube.com/watch?v=_hMmJlc6emw
Here I'm oscillating the ferrite rod magnet piston off a 50 milliwatt inductive backspike from a "Reed Switch Spinner". The 75mH series connected ferrite core bifilar coil is in series with a 70uF 25 volt electrolytic capacitor for a resonant LC tank frequency of 70 Hertz.
https://www.youtube.com/watch?v=_hMmJlc6emw
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