<p dir="ltr">Maybe you could add an inductor or some other "anti capacitor" in series to cancel out most of the capacitance of our non linear capacitor. This opposing part would have to not depend on dc. Then the dc dependent capacitance of the non linear caps would be a much larger part of the whole effective capacitance.</p>
<br><div class="gmail_quote"><div dir="ltr">On Thu, 6 Apr 2017 22:22 Mattias Rickardsson, <<a href="mailto:mr@analogue.org">mr@analogue.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto" class="gmail_msg">Maybe some kind of "differential" mode could expand that octave into a larger range?<div dir="auto" class="gmail_msg"><br class="gmail_msg"></div><div dir="auto" class="gmail_msg">Daft idea anyway, for synthesis. :-) But it wouldn't be surprising if some clever constructions actually utilise the voltage dependency in order to auto-stabilize some frequency etc.</div><div dir="auto" class="gmail_msg"><br class="gmail_msg"></div><div dir="auto" class="gmail_msg">/mr</div><div dir="auto" class="gmail_msg"><br class="gmail_msg"></div></div><div class="gmail_extra gmail_msg"><br class="gmail_msg"><div class="gmail_quote gmail_msg">Den 6 apr. 2017 8:31 em skrev "Richie Burnett" <<a href="mailto:rburnett@richieburnett.co.uk" class="gmail_msg" target="_blank">rburnett@richieburnett.co.uk</a>>:<br type="attribution" class="gmail_msg"><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">You wouldn't be able to sweep your filter over a very large frequency range though. The change in capacitance is one decade at most even for the smallest package sizes with the crappiest dielectric material.<br class="gmail_msg">
<br class="gmail_msg">
-Richie,<br class="gmail_msg">
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-----Original Message----- From: Mattias Rickardsson<br class="gmail_msg">
Sent: Thursday, April 06, 2017 4:38 PM<br class="gmail_msg">
To: Michael Zacherl<br class="gmail_msg">
Cc: synth-diy mailing list<br class="gmail_msg">
Subject: Re: [sdiy] Using non-linear passives<br class="gmail_msg">
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On 5.Apr 2017, at 17:04 , cheater00 cheater00 <<a href="mailto:cheater00@gmail.com" class="gmail_msg" target="_blank">cheater00@gmail.com</a>> wrote:<br class="gmail_msg">
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<blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
So effectively a DC bias could create a voltage controlled filter just like that<br class="gmail_msg">
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Almost like in the Moog ladder filter. :-D<br class="gmail_msg">
<br class="gmail_msg">
/mr<br class="gmail_msg">
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