This is how it is made:
One inductor L connected in series with a variable resistor R1.
One capacitor C connected in series with a variable resistor R2.
The 2 networks are connected in parallel.
The mic 2.3 terminals are connected in parallel too. (Attention to condenser mics, this filter is connected to the output of a mic. If a ribbon or moving coil mic or bass guitar pickup coil is used they would not mind, other active devices may do mind at some setting). Just an inductor has already been used on previous Pleiades experiments with classic electron tube condenser mics with no problem. Your own risk.
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