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== Clones and schematics ==
In chronological order:
* [http://analogue.bytenoise.co.uk/message/70a13992bd45f021330686a0f3795f991885e041 discrete SSM2040-style filter] by [[Jürgen Haible]], 1997.
* [http://www.jhaible.com/tonline_stuff/jh2040.gif SSM2040 Style 4 pole Filter] by [[Jürgen Haible]], 1998. A [[discrete]] version that reproduces the original sound. A lot of component selection is needed (matching transistor pairs). The circuit is not a pin for pin replacement, and it has a voltage controlled resonance path added. There'a little error in the drawing: the pnp current mirrors have C and E mixed up.
* [http://www.schmitzbits.de/rs2040.html SMD SSM 2040 filter] by René Schmitz, 1999
* [http://www5b.biglobe.ne.jp/~houshu/synth/Vcf0211a.GIF 4-pole VCF] by Osamu Hoshuyama, 2002
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