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On only one tl074 and support Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 Hardware/lib/Kosmo_panel | 1 | B10k | \*\*Potentiometer, 9 mm vertical board mount | | J2 | 1 | 1 uF tantalum\nYuSynth 1, 10 µF tanty looks better than EL\n(higher output, less leakage)\nbut only by a little. 1 µF \npolyester film looks much \nbetter. Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | Tayda | A-1847 | | | | | | C6, C7, C8, C9 | 4 Hardware/PCB/precadsr/precadsr.sch | 412 Hardware/PCB/precadsr/precadsr.xml | 1557 Hardware/PCB/precadsr/sym-lib-table | 2 .../Unseen Servant/Unseen Servant.kicad_pro | 2 | | Tayda | A-159.

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