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The 10 nF (C2) and 50 mH (L2) form a fairly resonant (aka peaking) high pass filter at a frequency of 7117.6 Hz. That is what gives you voltage amplification. Here's a quick simulation of just those parts: -

enter image description here

As can be seen the peak is at 7.119 kHz (near enough to my calculation) and has a magnitude of over 31 dB.

The 10 nF (C2) and 50 mH (L2) form a fairly resonant (aka peaking) high pass filter at a frequency of 7117.6 Hz. That is what gives you voltage amplification. Here's a quick simulation of just those parts: -

enter image description here

As can be seen the peak is at 7.119 kHz and has a magnitude of over 31 dB.

The 10 nF (C2) and 50 mH (L2) form a fairly resonant (aka peaking) high pass filter at a frequency of 7117.6 Hz. That is what gives you voltage amplification. Here's a quick simulation of just those parts: -

enter image description here

As can be seen the peak is at 7.119 kHz (near enough to my calculation) and has a magnitude of over 31 dB.

2 added 217 characters in body
source | link

The 10 nF (C2) and 50 mH (L2) form a fairly resonant (aka peaking) high pass filter at a frequency of 7117.6 Hz. That is what gives you voltage amplification. Here's a quick simulation of just those parts: -

enter image description here

As can be seen the peak is at 7.119 kHz and has a magnitude of over 31 dB.

10 nF (C2) and 50 mH (L2) form a fairly resonant (aka peaking) high pass filter at a frequency of 7117.6 Hz. That is what gives you voltage amplification.

The 10 nF (C2) and 50 mH (L2) form a fairly resonant (aka peaking) high pass filter at a frequency of 7117.6 Hz. That is what gives you voltage amplification. Here's a quick simulation of just those parts: -

enter image description here

As can be seen the peak is at 7.119 kHz and has a magnitude of over 31 dB.

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source | link

10 nF (C2) and 50 mH (L2) form a fairly resonant (aka peaking) high pass filter at a frequency of 7117.6 Hz. That is what gives you voltage amplification.