In an old ADSL filter which was not adequately filtering out noise on the phone line at a client's house was a 1uF 100V Jun Fu bipolar electrolytic capacitor.
I recommend against using aluminium electrolytic capacitors in DSL filters, because they can deteriorate over time, even the good ones. But you can't tell if they have electrolytic capacitors unless you open them (and void the approval).
Good filters have polyester or polypropylene and sometimes tantalum (still a good choice) capacitors inside.
The largest non-electrolytic capacitor I have seen in a DSL filter was a 1uF 63V polyester unit.
I recommend against using aluminium electrolytic capacitors in DSL filters, because they can deteriorate over time, even the good ones. But you can't tell if they have electrolytic capacitors unless you open them (and void the approval).
Good filters have polyester or polypropylene and sometimes tantalum (still a good choice) capacitors inside.
The largest non-electrolytic capacitor I have seen in a DSL filter was a 1uF 63V polyester unit.
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