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Debugging Notes from MK's PCB livestream - avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals - make power connection traces larger; MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 10k | Resistor | | | S2 | 1 | SW_3PDT_x3 | Switch, single pole normally-open tactile switch Light Touch Switch, https://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE28.pdf Light Touch Switch, http://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE3.pdf SMD SMT crystal Abracon ABM10 Abracon Miniature Ceramic Smd Crystal ABM10 http://www.abracon.com/Resonators/ABM10.pdf SMD SMT Miniature Crystal Clock Oscillator TXCO Fordahl DFA S11-OV/UOV, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, hand-soldering, 9.1x7.2mm^2 package Miniature Crystal Clock Oscillator TXC 7C series, http://www.txccorp.com/download/products/osc/7C_o.pdf, hand-soldering, 5.0x3.2mm^2 package SMD Crystal Seiko Epson MC-506 http://media.digikey.com/pdf/Data%20Sheets/Epson%20PDFs/MA-505,506.pdf, 12.7x5.1mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002LB https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, hand-soldering, 10.5x5.0mm^2 package SMD Crystal SERIES SMD2520/4 http://www.newxtal.com/UploadFiles/Images/2012-11-12-09-29-09-776.pdf, 2.5x2.0mm^2 package SMD Crystal Seiko Epson MC-505 http://media.digikey.com/pdf/Data%20Sheets/Epson%20PDFs/MA-505,506.pdf, hand-soldering, 11.7x4.0mm^2 package SMD Crystal Seiko Epson SG-8002CE https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, hand-soldering, 3.2x2.5mm^2 package Miniature Crystal Clock Oscillator IQXO-70, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, hand-soldering, 7.3x5.1mm^2 package Miniature Crystal Clock Oscillator EuroQuartz XO32 series, http://cdn-reichelt.de/documents/datenblatt/B400/XO32.pdf, 3.2x2.5mm^2 package crystal Ceramic Resin Sealed SMD http://www.foxonline.com/pdfs/fe.pdf, hand-soldering, 7.5x5.0mm^2 package crystal Epson Toyocom FA-238 series http://www.mouser.com/ds/2/137/1721499-465440.pdf, hand-soldering, 3.2x2.5mm^2 package SMD Crystal EuroQuartz MJ series http://cdn-reichelt.de/documents/datenblatt/B400/MJ.pdf, hand-soldering, 5.0x3.2mm^2 package SMD Resomator/Filter Murata CDSCB, http://cdn-reichelt.de/documents/datenblatt/B400/SFECV-107.pdf, 4.5x2.0mm^2 package SMD Resomator/Filter Murata CDSCB, http://cdn-reichelt.de/documents/datenblatt/B400/SFECV-107.pdf, 4.5x2.0mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002CE https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, hand-soldering, 10.5x5.0mm^2 package SMD Watch Crystal MicroCrystal CC1V-T1A series https://www.microcrystal.com/fileadmin/Media/Products/32kHz/Datasheet/CC1V-T1A.pdf, 8.0x3.7mm^2 package SMD Crystal Seiko Epson MC-506 http://media.digikey.com/pdf/Data%20Sheets/Epson%20PDFs/MA-505,506.pdf, hand-soldering, 12.7x5.1mm^2 package SMD Crystal Oscillator Seiko Epson MC-406 https://support.epson.biz/td/api/doc_check.php?dl=brief_MC-306_en.pdf, hand-soldering, 9.6x4.1mm^2 package SMD Resomator/Filter Murata CDSCB, http://cdn-reichelt.de/documents/datenblatt/B400/SFECV-107.pdf, hand-soldering, 4.5x2.0mm^2 package SMD Crystal MicroCrystal MS3V-T1R 5.2mm length 1.4mm diameter http://www.microcrystal.com/images/_Product-Documentation/03_TF_metal_Packages/01_Datasheet/MS3V-T1R.pdf SMD Crystal Seiko Epson MC-506 http://media.digikey.com/pdf/Data%20Sheets/Epson%20PDFs/MA-505,506.pdf, 12.7x5.1mm^2 package SMD Resomator/Filter Murata CDSCB, http://cdn-reichelt.de/documents/datenblatt/B400/SFECV-107.pdf, hand-soldering, 7.9x3.8mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002CE https://support.epson.biz/td/api/doc_check.php?mode=dl⟨=en&Parts=SG-8002DC, hand-soldering, 10.5x5.0mm^2 package SMD Crystal EuroQuartz.

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