[sdiy] Using non-linear passives

[cheater00 cheater00]

Hi guys,
I've recently been reminded that ceramic caps (eg x5r) will only adhere to
their rating up to 1V, and will then start losing capacitance as you go
beyond. So effectively a DC bias could create a voltage controlled filter
just like that, with no semiconductors. I wonder, has anyone tried this?

What are some other non-linear passives? I guess some magnetics saturate
but I don't know much about that.

I guess you can call memristors passives, and they have memory, so they're
non-linear.
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