[sdiy] Possible 2164 12db/oct bandpass filter design..

Jean-Pierre Desrochers jpdesroc at oricom.ca
Wed Jun 5 17:29:18 CEST 2019


You are probably right Ritchie.

-----Message d'origine-----
De : Richie Burnett [mailto:rburnett at richieburnett.co.uk] 
Envoyé : 5 juin 2019 11:10
À : Jean-Pierre Desrochers; 'Paul Dugan'
Cc : Synth-diy at synth-diy.org
Objet : Re: [sdiy] Possible 2164 12db/oct bandpass filter design..

Don't you need to also change the feedback to be positive feedback instead 
of negative feedback in order to achieve resonance using this method?  I 
might be wrong, but I thought that was the case because the phase shift 
around the loop is 0 degrees at the cutoff frequency instead of -180 
degrees.

-Richie,

-----Original Message----- 
From: Jean-Pierre Desrochers
Sent: Wednesday, June 05, 2019 3:46 PM
To: 'Paul Dugan'
Cc: Synth-diy at synth-diy.org
Subject: Re: [sdiy] Possible 2164 12db/oct bandpass filter design..



Use the following schematic :

https://userdisk.webry.biglobe.ne.jp/000/024/65/1/VcfSSM0602a.GIF



and modify the 1st and 2nd   filter sections to be HPF and keep the 3rd and 
4rth as LPF.

You will end up with a 12db/oct Bandpass filter using one SSM2164 IC.



JP





De : Paul Dugan [mailto:mathlyfe at icloud.com]
Envoyé : 5 juin 2019 00:50
À : jpdesroc at oricom.ca
Objet : Re: [sdiy] Possible 2164 12db/oct bandpass filter design..





Hi there,







I saw an old thread on the SDIY mailing list about a 12db/oct bandpass 
filter. I’m looking for something similar myself, so I tried to follow the 
link http://www.arcenson.com/public/2164_BP_filter.JPG but it appears to be 
dead. Any chance you have that file saved and can share it?







Cheers,







Paul






Virus-free. www.avg.com





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