CGS Serge resonant equalizer: Difference between revisions

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Line 12: == A little on how it works == [[File:cgs_schem_cgs202_res_eq.gif\|thumb\|center\|800px\|Click through to view an enlarged copy of the schematic.]] === Note from Aaron Lanterman (19 Dec 2022) === I wanted to share some research I've been doing into the Serge Resonant Equalizer, with the help of Serge Tcherepnin, Yves Chartier, and many folks on the [http://synth-diy.org/pipermail/synth-diy/2022-December/thread.html#130816 SDIY mailing list]. The top three filters on the CGS schematic are incorrect. The input of the 2nd op amp should be taken from the + input of the 1st op amp. The resulting filter is a "ideal current-inversion negative-immittance converter (INIC) bandpass filter" per a "Handbook Of Operational Amplifier Active RC Networks" TI (actually Burr Brown) app note by Carter and Huelsman. Note that the mixing op amp has slightly different resistors from the higher bands to the virtual ground than the lower bands; this is needed to get the volumes of the different filters to match up.[[File:cgs serge resonant equalizer filter top and bottom filter bandwidths.jpg\|thumb\|center\|300px\|Note the top and bottom filter have bandwidths that are slightly wider than the rest.]] == Construction == [[File:cgs_pcb_cgs202v1.1_re.gif\|thumb\|center\|900px\|The component overlay for the VER1.0 PCB. Click through for an enlarged, printable version. Print at 300dpi.]] [[File:cgs_panel_res_eq.gif\|\|thumb\|right\|120px\|]] Before you start assembly, check the board for etching faults. Look for any shorts between tracks, or open circuits due to over etching. Take this opportunity to sand the edges of the board if needed, removing any splinters or rough edges. Line 192 ⟶ 196: * 330R refers to 330 Ohms. 100 nF = 0.1 uF. * PCB 6" x 2" with 3mm mounting holes 0.15" in from the edges. == CC-BY-NC == Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work. Serge Tcherepnin retains all rights to his work. == See also == Line 199 ⟶ 206: == References == * ''[https://web.archive.org/web/~~20180209234737fw_~~20180209234737f/http://www.CGS.synth.net:80/modules/CGS202_reseq.html Serge Resonant Equalizer for music synthesizers.]'' ~~(archived)~~ by Ken Stone, 2010, with permission of the author - archived == External links == * [https://web.archive.org/web/20190427005433/http://www.serge.synth.net/documents/kit/res_eq.html Original Serge kit instructions.] * [http://groups.yahoo.com/group/CGS_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc. === Suppliers === * [https://web.archive.org/web/20181025065301/http://www.elby-designs.com/webtek/cgs/serge/cgs202/cgs202_reseq.html CGS202 Resonant Equalizer], revision 1.1, Elby Designs [[Category:CGS ~~modular~~signal processors]]