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VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a cylinder with a 7-segment display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see http://www.onsemi.com/pub/Collateral/QRE1113-D.PDF PhotoDiode, plastic SMD DIL, 4.5x4mm² PhotoDiode plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5488319/BPW%2034%20S_EN.pdf PhotoDiode, Clear Silicone, Osram TOPLED, 4x5.09mm, area: 2.85x2.85mm, Orientation mark at cathode, https://optoelectronics.liteon.com/upload/download/DS22-2009-0099/LTW-M670ZVS-M5_0906.pdf LED RGB NeoPixel Nano LED RGB NeoPixel addressable PLCC-4 5050 LED, SMD, PLCC-2, 3.0 x 2.0mm, orientation marker at cathode, https://dammedia.osram.info/media/resource/hires/osram-dam-25688470/SFH%202201%20A01_EN.pdf PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.2x2.2mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5989350/BP%20104%20FAS_EN.pdf PhotoDiode, plastic DIL, 4.3x4.65mm², RM5.08 PhotoDiode plastic SMD SmatDIL Resistor, LDR 20mm diameter, pin pitch 5.00mm diameter 7mm Inductor, Radial series, Radial, pin pitch=2.50mm 5.00mm, , length*width=7*3.5mm^2, Capacitor C Radial series Radial pin pitch 7.50mm length 9mm width 3.9mm Capacitor C, Rect series, Radial, pin pitch=5.00mm, , diameter*width=4.7*2.5mm^2, Capacitor, http://www.vishay.com/docs/45233/krseries.pdf C Disc series Radial pin pitch 5.00mm diameter 10mm Electrolytic Capacitor CP, Axial series, Axial, Vertical, pin pitch=2.54mm, , length*diameter=5.2*2.7mm^2, , http://www.diodes.com/_files/packages/DO-41%20(Plastic).pdf Diode DO-41_SOD81 series Axial Horizontal pin pitch 15.00mm length 18mm diameter 8mm Inductor, Axial series, Axial, Vertical, pin pitch=7.62mm, , length*width=21.59*11.43mm^2, Pulse, KM-3, http://datasheet.octopart.com/PE-92112KNL-Pulse-datasheet-17853305.pdf L_Toroid Vertical series Radial pin pitch 15.24mm 0.5W = 1/2W, length*diameter=9*3.2mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf Resistor Axial_DIN0207 series Axial Vertical pin pitch 5.30mm length 14mm width 5.6mm Bourns 5700 L_Toroid, Vertical series, Radial, pin pitch=22.00mm, , length*width=27*9mm^2, Capacitor C Radial series Radial pin pitch 5.00mm diameter 10.0mm Neosid SD12 style2 Inductor, Radial series, Radial, pin pitch=7.62*7.62mm^2, , length*width=10.16*10.16mm^2, Pulse, LP-30, http://datasheet.octopart.com/PE-54044NL-Pulse-datasheet-5313493.pdf Inductor Radial series Radial pin pitch 22.90mm diameter 25.4mm Vishay TJ5 BigPads L_Toroid, Vertical series, Radial, pin pitch=5.00mm, 7W, length*width=13.0*9.0mm^2, http://www.vishay.com/docs/30218/cpcx.pdf Resistor Radial_Power series Radial pin pitch 2.50mm diameter 5.0mm z-position of LED center 2.0mm, 2 pins diameter 3.0mm z-position of LED center 2.0mm, 2 pins, pitch 10mm, size 35x9mm^2, drill diamater 1.3mm, pad diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00045_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT single screw terminal block RND 205-00053 pitch 5mm size 41.5x15mm^2 drill 1.2mm pad 2.4mm Terminal Block Phoenix PT-1,5-15-3.5-H pitch 3.5mm size 42x7.6mm^2 drill 1.2mm pad 3mm Terminal Block WAGO 804-124 45Degree pitch 5mm size 20x8mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-201 45Degree pitch 5mm size 7.3x14mm^2 drill 1.15mm pad 3mm Terminal Block 4Ucon ItemNo. 10684, 7 pins, pitch 2.54mm, drill diameter 0.8mm wire loop bead wire loop.

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