[sdiy] Weird Serge Resonant Filter topology in upper bands
guy.mccusker at gmail.com
Thu Dec 15 08:56:10 CET 2022
Isn’t Rod Elliott’s Fig 7 exactly what Don drew?
On Thu, 15 Dec 2022 at 03:42, Lanterman, Aaron D via Synth-diy <
synth-diy at synth-diy.org> wrote:
> On Dec 13, 2022, at 4:39 AM, René Schmitz <synth at schmitzbits.de> wrote:
> On 13.12.2022 10:22, René Schmitz wrote:
> But if you swap + and -, and tap at the -input, then it works like I'd
> Now it starts to look familiar. The opamp forms a negative impedance
> And of course one can as well tap at the + input. Forming a voltage
> divider between C2/R1 and the NIC reflected R4/C1 impedance.
> So I did find a filter that looks like Rene’s filter (which I’m going to
> call the Rene filter until I find out something else it should be called),
> namely Figure 7 here on one of Rod Elliott’s pages:
> Except Rod’s op amp inputs are flipped relative to Rene’s.
> Aaron Lanterman, Prof. of ECE, Georgia Tech
> My blog on Education and Innovation: https://edupocalypsenow.wordpress.com
> My blog on Electronics and Programming: https://lantertronics.blogspot.com
> My YouTube channel on Electronics and Programming:
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> Selling or trading? Use marketplace at synth-diy.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Synth-diy