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Generally you don't need to worry, any filter is going to
be with +- 10% of spec at worst.
If you want to be anal. Head down to the local electronics
hobby shop and have the guy test values before purchase
and get as close as possible.
2 0.056uF capacitors
1 100ohm resistor
1 0.47mH voice grade transformer
ring and trip of the phone line goes to the caps, the caps go
to the transformer, the resistor goes across the 2 inputs
inbetween the caps and the transformer. Other side of
the transformer to the phone.
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This AVS pays my mortgage!
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