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Straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 1M | Resistor | | | | R21, R22, R23 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 Standard switching diode, DO-35 2x5 pin shrouded header 2.54 mm spacing D Switch, single pole double throw, center OFF position K switch normally-open pushbutton push-button LCD illuminated right angle Molex 0.50mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0300, 30 Circuits (https://www.molex.com/pdm_docs/sd/2005280300_sd.pdf), generated with kicad-footprint-generator Molex PicoBlade Connector System, 53048-1010, 10 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator Capacitor SMD Kemet-E (7360-38 Metric), IPC_7351 nominal, (Body size source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SO, 16 Pin (http://www.analog.com/media/en/technical-documentation/data-sheets/LTC7810.pdf), generated with kicad-footprint-generator JST XA series connector, S7B-EH (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Harting har-flexicon series connector, BM11B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Angled solder pin 1 x 1 mm, 734-174 , 14 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator JST SUR series connector, BM09B-GHS-TBT (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated.

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