Diode-Bridge Voltage-Controlled Attenuator - bom/diode-vca-attenuator-bom.csv

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John Lauer Saif Abdessayed's diode-bridge VCA: KiCad project, Gerbers, BOM, simulations, reports, and the earlier RC filter test 45f3ff6 11d ago
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Refs,Qty,Value / function,Manufacturer,Exact MPN,Electrical rating,PCB footprint,DigiKey / sourcing status (checked 2026-10-08),Assembly note
U1,1,Dual JFET op amp,Texas Instruments,TL072CP,"30 V supply span; 13 V/us typical; PDIP-8",AnalogVCA_THT:DIP8_W7.62mm,"296-1775-5-ND; Active; 64 in stock when checked","Notch toward pin-1 mark"
Q1,1,NPN servo transistor,onsemi,2N3904BU,"40 V; 200 mA; 625 mW",AnalogVCA_THT:TO92_Inline_EBC,"2N3904FS-ND; Active; 248803 in stock when checked","Flat-face lead order E-B-C; verify before insertion"
D1-D4,4,Fast switching diode,onsemi,1N4148,"100 V; 200 mA; 4 ns; DO-35",AnalogVCA_THT:D_DO35_V_KBottom_P10.16mm,"1N4148FS-ND; Active; 666601 in stock when checked","Cathode band to square pad 1; use one lot if possible"
R1,1,1 kOhm 1%,Yageo,MFR-25FBF52-1K,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_DIN0207_P10.16mm,"1.0KXBK-ND; exact part Active; 88126 in stock when checked","Horizontal axial"
R2 R8,2,1 MOhm 1%,Yageo,MFR-25FBF52-1M,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_DIN0207_P10.16mm,"Yageo MFR-25FBF52 family; exact value stock not rechecked","Horizontal axial"
R3,1,2.2 kOhm 1%,Yageo,MFR-25FBF52-2K2,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_DIN0207_P10.16mm,"Yageo MFR-25FBF52 family; exact value stock not rechecked","Horizontal axial"
R4,1,100 kOhm 1% onboard load,Yageo,MFR-25FBF52-100K,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_DIN0207_P10.16mm,"Yageo MFR-25FBF52 family; exact value stock not rechecked","Do not omit; this is the specified output load"
R5,1,22 kOhm 1%,Yageo,MFR-25FBF52-22K,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_V_P1Bottom_P10.16mm,"Yageo MFR-25FBF52 family; exact value stock not rechecked","Vertical board orientation footprint"
R6,1,8.06 kOhm 1%,Yageo,MFR-25FBF52-8K06,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_DIN0207_P10.16mm,"8.06KXBK-ND; Active; 3264 in stock when checked","Sets control-current scale"
R7,1,10 kOhm 1%,Yageo,MFR-25FBF52-10K,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_DIN0207_P10.16mm,"Yageo MFR-25FBF52 family; exact value stock not rechecked","Control-input filter"
R9,1,4.7 kOhm 1%,Yageo,MFR-25FBF52-4K7,"0.25 W; metal film; 1%",AnalogVCA_THT:Axial_V_P1Top_P10.16mm,"Yageo MFR-25FBF52 family; exact value stock not rechecked","Vertical board orientation footprint"
C1 C2,2,220 uF bipolar audio,Nichicon,UES1E221MHM,"220 uF; 25 V; +/-20%; bipolar; 85 C",AnalogVCA_THT:Radial_Bipolar_D12.5_P5.0mm,"493-15026-ND; Active; 1507 in stock when checked","Bipolar part only; 12.5 mm diameter; 5 mm pitch"
C3-C5,3,100 nF X7R,Murata Electronics,RCER71H104K0K1H03B,"0.1 uF; 50 V; +/-10%; X7R",AnalogVCA_THT:C_Disc_P5.00mm,"490-11886-ND; Active; 17865 in stock when checked","Formed 5.00 mm lead pitch; corrected from rejected 2.5 mm-pitch candidate"
C6 C7,2,Rail bulk capacitor,Nichicon,UHE1E100MDD,"10 uF; 25 V; polarized; radial",AnalogVCA_THT:C_Radial_D5_P2.0mm,"Manufacturer series/datasheet confirmed; live exact stock not rechecked","C6 + to +12 V; C7 + to GND"
J1,1,3-position power terminal,Phoenix Contact,1715734,"15 A; 300 V; 5.08 mm pitch",AnalogVCA_THT:Terminal_1x03_P5.08mm,"277-1264-ND; Active; 6042 in stock when checked","Left-to-right as silk: +12 / GND / -12"
J2 J3 J4,3,2-position terminal,Phoenix Contact,1715721,"15 A; 300 V; 5.08 mm pitch",AnalogVCA_THT:Terminal_1x02_P5.08mm,"277-1263-ND; Active; 8529 in stock when checked","J2 input/GND; J3 control/GND; J4 output/GND"