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Assembly Notes: Do not connect the Normal pin for op 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 Envelope/Envelope.kicad_pcb | 2 | 10uF | Polarized capacitor | | | | S1 | 1 nF | Unpolarized capacitor | | | C2 | 1 | SW_DPDT_x2 | Switch, triple pole double throw | | | | Tayda | A-553 | | | | | | S1 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x7 | | | R9 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch - number of pins: 12; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1806229 12A 630V Generic Phoenix Contact connector footprint for: MSTBV_2,5/9-GF-5,08; number of pins: 05; pin pitch: 5.00mm; Vertical || order number: 1776537 12A || order number: 1923940 16A (HC Generic Phoenix Contact connector footprint for: MSTBV_2,5/5-GF-5,08; number of pins: 02; pin pitch: 3.50mm; Angled || order number: 1776731 12A || order number: 1806300 12A 630V Generic Phoenix Contact connector footprint for: MSTBV_2,5/7-GF; number of pins: 08; pin pitch: 3.50mm; Angled || order number: 1843321 8A 160V Generic Phoenix Contact connector footprint for: GMSTBA_2,5/8-G; number of pins: 11; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1777154 12A || order number: 1757514 12A || order number: 1776553 12A || order number: 1830732 8A 160V Generic Phoenix Contact SPT 5/8-V-7.5-ZB Terminal Block, 1719299 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719299), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 40 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=295), generated with kicad-footprint-generator JST XA series connector, S8B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin (http://www.issi.com/WW/pdf/61-64C5128AL.pdf), generated with kicad-footprint-generator JST PH top entry connector Molex KK-396 vertical Molex KK 396 Interconnect System, old/engineering.

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