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Amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF 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 supporting components. ~$6 in parts, depending mainly on whether 8+6 pins + hardware fits on shaek board or similar size perf. MiniADSR derived from this software without specific prior written permission. This software consists of voluntary contributions made by Sharp Solid State relais SSR Sharp Sanyo SIP-15, 78.0mm x 8.0mm bosy size, STK-437E STK-439E STK-441E STK-443E (http://datasheet.octopart.com/STK430-Sanyo-datasheet-107060.pdf 8-Lead Plastic VSON, 3x3mm Body, 0.5mm Pitch, http://www.ti.com/lit/ds/symlink/ts3a24159.pdf Texas Instruments, DSBGA, 0.822x1.116mm, 5 bump 2x1x2 array, NSMD pad definition (http://www.ti.com/lit/ds/symlink/lmc555.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments, DSBGA, 1.5195x1.5195x0.600mm, 8 ball 3x3 area grid, NSMD pad definition Appendix A BGA 1156 1 FF1157 FFG1157 FFV1157 FF1158 FFG1158 FFV1158 Virtex-7 BGA, 42x42 grid, 42.5x42.5mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=302, NSMD pad definition Appendix A BGA 225 0.8 CSGA225 Spartan-7 BGA, 15x15 grid, 13x13mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=77, NSMD pad definition (http://www.ti.com/lit/ds/symlink/bq51050b.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments, BGA Microstar Junior, 2x2.5mm, 12 bump 3x4 (area) array, NSMD pad definition (http://www.ti.com/lit/ds/slas718g/slas718g.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments CSD18531Q5A http://www.ti.com/lit/ds/symlink/csd18531q5a.pdf WSON, 6 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-dfn/05081703_C_DC6.pdf), generated with kicad-footprint-generator XP_POWER ITQxxxxS-H SIP DCDC-Converter XP_POWER JTE06 Dual Crystal THT HC-52/8mm, http://www.kvg-gmbh.de/assets/uploads/files/product_pdfs/XS71xx.pdf Crystal THT DS10 1.0mm diameter http://www.microcrystal.com/images/_Product-Documentation/03_TF_metal_Packages/01_Datasheet/DS-Series.pdf SMD Crystal EuroQuartz MT series http://cdn-reichelt.de/documents/datenblatt/B400/MT.pdf, hand-soldering, 3.2x2.5mm^2 package crystal Epson Toyocom TSX-3225 series https://support.epson.biz/td/api/doc_check.php?dl=brief_fa-238v_en.pdf, 3.2x2.5mm^2 package SMD Crystal MicroCrystal MS1V-T1K 6.1mm length 2.0mm diameter http://www.microcrystal.com/images/_Product-Documentation/03_TF_metal_Packages/01_Datasheet/DS-Series.pdf SMD Crystal Oscillator Seiko Epson MC-506 http://media.digikey.com/pdf/Data%20Sheets/Epson%20PDFs/MA-505,506.pdf, 11.7x4.0mm^2 package SMD Crystal EuroQuartz MQ series http://cdn-reichelt.de/documents/datenblatt/B400/MQ.pdf, 7.0x5.0mm^2 package Miniature Crystal Clock Oscillator Abracon ASDMB series, 2.5x2.0mm package, http://www.abracon.com/Oscillators/ASDMB.pdf Miniature Crystal Clock Oscillator EuroQuartz XO91 series, http://cdn-reichelt.de/documents/datenblatt/B400/XO91.pdf, 7.0x5.0mm^2 package SMD Crystal Oscillator Seiko Epson MC-506 http://media.digikey.com/pdf/Data%20Sheets/Epson%20PDFs/MA-505,506.pdf, hand-soldering, 11.7x4.0mm^2 package SMD Crystal ABS25 https://abracon.com/Resonators/abs25.pdf, 8.0x3.8mm^2 package SMD Crystal TXC 9HT11 http://txccrystal.com/images/pdf/9ht11.pdf, hand-soldering, 2.0x1.2mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002JC https://support.epson.biz/td/api/doc_check.php?mode=dl⟨=en&Parts=SG-8002DC, 10.5x5.0mm^2 package SMD Crystal EuroQuartz MJ series http://cdn-reichelt.de/documents/datenblatt/B400/MJ.pdf, 5.0x3.2mm^2 package Miniature Crystal Clock Oscillator.

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