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Another version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, based on the Program) on a decade counter expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many people have made it clear that any problems introduced by others will not work. Ask me how I know this. And by "ask me" I mean "shut up". BIN Images/capsocket.png Normal file Unescape Hardware/Panel/precadsr_panel_al/precadsr_panel_al.sch Normal file Unescape Hardware/PCB/precadsr/ao_tht.pretty/DIP-6_W7.62mm_Socket_LongPads.kicad_mod Normal file View File Datasheets/tl074.pdf Normal file Unescape Hardware/PCB/precadsr_aux_Gerbers/precadsr-B_Paste.gbr Normal file Unescape Hardware/PCB/precadsr/ao_tht.pretty/Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical.kicad_mod Normal file View File 3D Printing/Cases/Eurorack 2-Row/2row_frame.scad Executable file Unescape Hardware/PCB/precadsr_Gerbers/precadsr-F_Cu.gbr Normal file Unescape ; DRILL file {KiCad 5.1.10-88a1d61d58~90~ubuntu20.04.1} date Sat Aug 7 10:22:31 2021 e6b834b08c Fix floating pin for op amp 54f1a61ba5 gets jiggy with PCB cutout, light-direction downwards, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105.pdf package for diode bridges, row spacing 7.62 mm (300 mils), SMDSocket, SmallPads 18-lead though-hole mounted DIP package, row spacing 8.61 mm (338 mils), body size 9.78x30.12mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/209-210.pdf), LowProfile 2x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), LongPads, see https://ac-dc.power.com/sites/default/files/product-docs/tinyswitch-iii_family_datasheet.pdf PowerIntegrations variant of 8-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size 10.8x32.04mm 12x-dip-switch SPST , Slide, row spacing 11.48 mm (451 mils 18-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size 9.78x30.12mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile, JPin.

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