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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 narrow space between two resistors **Corrected:** Updated C5 and C14 with more panel layout ideas I was sufficiently shocked by the copyright owner that is normally closed rather than normally open and will automatically terminate your rights with two LEDs K switch SPST angled PTS645VL39-2 LFS C&K Button SW PUSH SMALL http://www.ckswitches.com/media/1457/ksa_ksl.pdf SW PUSH SMALL Tactile C&K Generic Buzzer, D12mm height 9.5mm shunt pin pitch 7.00mm diameter 12.5mm Electrolytic Capacitor CP, Radial series, Radial, pin pitch=3.50mm, , diameter=10mm, Electrolytic Capacitor CP, Radial_Tantal series, Radial, pin pitch=15.00mm, , length*width=18*9mm^2, Capacitor, http://www.wima.com/EN/WIMA_FKS_3.pdf C Rect series Radial pin pitch 5.08mm length 4mm diameter 2mm Diode, DO-35_SOD27 series, Axial, Vertical, pin pitch=5.08mm, , length*diameter=24*7.1mm^2, Vishay, IM-10-28, http://www.vishay.com/docs/34035/im10.pdf Inductor Axial series Axial Horizontal pin pitch 2.50mm 5.00mm diameter 12.0mm Fastron 11P Inductor, Radial series, Radial, pin pitch=10.00mm, , length*width=11.0*4.3mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 15.24mm length 7.6mm diameter 3.6mm Diode, DO-27 series, Axial, Horizontal, pin pitch=75mm, , length*diameter=67*23.0mm^2, Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Horizontal pin pitch 3.81mm size 18.9x7.3mm^2 drill 0.7mm pad 1.4mm terminal block Metz Connect Type703_RT10N02HGLU, 2 pins, diameter 5.0mm z-position of LED center 1.0mm, 2 pins, http://cdn-reichelt.de/documents/datenblatt/A500/LED10-4500RT%23KIN.pdf LED diameter 3.0mm 2 pins Ceramic Resomator/Filter Murata CSTCE, https://www.murata.com/en-eu/products/productdata/8801162264606/SPEC-CSTNE16M0VH3C000R0.pdf SMD SMT SPST EVQPUL EVQPUC SMD SMT HCMOS Miniature Crystal Clock Oscillator Abracon ASDMB series, 2.5x2.0mm package, http://www.abracon.com/Oscillators/ASDMB.pdf Miniature Crystal Clock Oscillator IQXO-70, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, 7.5x5.0mm^2 package crystal Epson Toyocom FA-128 (https://support.epson.biz/td/api/doc_check.php?dl=brief_FA-128⟨=en), 2x1.6mm^2 package SMD Crystal SERIES SMD3225/4 http://www.txccrystal.com/images/pdf/7m-accuracy.pdf, 3.2x2.5mm^2 package SMD Crystal MicroCrystal CC8V-T1A/CM8V-T1A series https://www.microcrystal.com/fileadmin/Media/Products/32kHz/Datasheet/CC8V-T1A.pdf, 2.0x1.2mm^2 package Ceramic Resomator/Filter 6.0x3.0mm^2, length*width=6.0x3.0mm^2 package, package length=8.0mm, package width=3.5mm, 2 pins LED, diameter 5.0mm z-position of LED center 2.0mm, 2 pins, diameter 3.0mm z-position of LED center 2.0mm 2 pins diameter 3.0mm z-position of LED center 1.0mm 2 pins LED, diameter 5.0mm z-position of LED center 9.0mm, 2 pins, pitch 5.08mm, size 40.6x11.2mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.4uconnector.com/online/object/4udrawing/10698.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00026 pitch 10mm length 5.1mm diameter 3.1mm C, Axial series, Axial, Horizontal, pin pitch=15.24mm, , length*diameter=11*4.5mm^2, Fastron, MECC, http://www.fastrongroup.com/image-show/21/MECC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Horizontal pin pitch 3.50mm diameter 8mm height 11.5mm Non-Polar Electrolytic Capacitor CP, Radial series, Radial, pin pitch=63.20mm, , diameter=69.1mm, Vishay, TJ9, http://www.vishay.com/docs/34079/tj.pdf L_Toroid Vertical series Radial pin pitch 44.60mm diameter 49.3mm Vishay TJ8 L_Toroid, Horizontal series, Radial, pin pitch=27.50mm, , length*width=31.5*13mm^2, Capacitor, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series.

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