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    Schematics / VCA 3

    < Arp 40235 Dual VCF Schematics | Schematics | Serge VCA as suggested by Serge Tchernepnin in an old issue of Electronotes >
    < Jurgen Haible Trapezoid VCA | Listbytype | Serge VCA as suggested by Serge Tchernepnin in an old issue of Electronotes >


    DIY | VCA | René Schmitz


    VCA 3 by René Schmitz ,visit http://www.uni-bonn.de/~uzs159/vca.html for more VCA ideas ,in depth look on OTA's ,temperature compensation and more . For this circuit on the page :

    My latest VCA is the one in the picture VCA3. This is the VCA that I use inside my so called "Blue Box". It is based on VCA 2, but shows a number of minor improvements (which can be retrofitted to VCA2). I have also shown my external pot connections. These were left out on the VCA2 drawing. I added a trimpot at the inverting input, so that the output offset can be eliminated. This makes it DC accurate. The adjustment is somewhat tricky, since it interacts with the CV rejection pot. You will have to adjust the trimmers alternatingly. Its well worth the effort, with careful adjustments you get it basically thump free. (But beware that your breath might have an impact on the setting, best is to insulate the pair with styrofoam or something.) Also there is the trimmer called "deaf-zone elimination" by which you can shift the point where the gain goes to 0, so that with 0V input (and the manual pot at the lowest setting) the VCA is just closed


    < Arp 40235 Dual VCF Schematics | Schematics | Serge VCA as suggested by Serge Tchernepnin in an old issue of Electronotes >
    < Jurgen Haible Trapezoid VCA | Listbytype | Serge VCA as suggested by Serge Tchernepnin in an old issue of Electronotes >

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