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Table 3 Signal conditioning stage passband gain values

From: A new portable ELF Schumann resonance receiver: design and detailed analysis of the antenna and the analog front-end

Cascaded stage number Electronic circuit Passband gain value (dB) at 10 Hz
1 Preamplifier 35.5
2 Low-pass and notch filter 3.5
3 Double notch 3.3
4 Double low-pass filter 10
5 High-pass filter 5
6 Voltage gain amplifier 1 to 20
Total passband gain, 20501 to 410,020 (86 to 112) dB at 10 Hz