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An LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet 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 arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a circle. Used only where users want round outlines by specifying ≥30 faces. Quality == "preview") ? 6 : quality == "fast preview") ? 12 : 12; // [1:1:84] width = 36; // [1:1:84] width = 12; // overkill; currently three 3.5mm jacks needing 8mm //calculated x value of exact middle of slider panel (between steps 5 and 6); middle of slider panel (between steps 5 and 6); middle of slider panel (between steps 5 and 6); middle of panel after deducting left/right sub-panels slider_center = (width_mm - left_panel_width - right_panel_width)/2 + left_panel_width; slider_bottom = v_margin+8; Panels/10_step_seq_38hp_v1.scad Normal file Unescape ``` git clone --recurse-submodules git@gitlab.com:rsholmes/precadsr.git ``` Or if you do not pertain to any person obtaining a copy Copyright (C) 2016 Felipe da Cunha Gonçalves Copyright 2015 Yohann Coppel Licensed under the Apache license: Copyright (c) Doug Clark Permission is hereby granted, free of charge, to any part of the following: * Bourns PTL series, such as: https://www.mouser.com/ProductDetail/Bourns/PTL30-15O0-105A2?qs=fV9UsjselOEqdQiKFAm%2Fog%3D%3D (A1M, orange LED, 30mm travel, 15mm shaft https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15R0-103B1/3781301 (red B10K) and https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15O0-105A2/7314942 (orange A1M * The 16 mm vertical board mount OR: | | Tayda | A-004 | | R1, R10, R11 | 3 | 1nF | Unpolarized capacitor | | D6, D7 | 2 Panels/futura medium condensed bt.ttf' ## Current draw ### Current draw 12 mA +12 V, and sustain voltage is taken from \npot pin 1. Cmp-Mod V01 Created by editing arbitrary text at 200-size from: https://www.myfonts.com/collections/quentin-font-urw?tab=individualStyles ... Panels/luther_triangle_vco_ .scad Normal file Unescape "Name": "Top Solder Mask" "Notes": "Type: dielectric layer 1 (from F.Cu to B.Cu)" "Name": "Bottom Solder Mask" "Notes": "Type: dielectric layer 1 (from F.Cu to B.Cu)" "Name": "Bottom Solder Paste" "Name": "Top Solder Mask" "Notes": "Type: dielectric layer 1 (from F.Cu to B.Cu)" "Name.

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