BOM for Afterburner PCB 3.2b
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* (R1 - 5x) Resistor 4k7 (TH or SMT 0805) 0.25W, 5% or better tolerance  - 5x
* (R8, R4) Resistor 10k (TH or SMT 0805) 1% or better tolerance - 2x
* (R5, R18) Resistor 100k (TH or SMT 0805) 1% or better tolerance - 2x
* (R6) Resistor 20k (TH or SMT 0805) 1% or better tolerance - 1x
* (R7, R3, R2) Resistor 3k3 (TH or SMT 0805) 1% or better tolerance - 3x
* (R9) Cermet trimmer (TH Suntan TSR-3362P-202R 2k) - 1x

* (C1, C5) Capacitor electrolytic 10uF, 25V or 50V, 20% tolerance or better (through hole) - 2x
* (C4) Capacitor electrolytic 220uF, 16V or higher, 20% tolerance or better (through hole) - 1x
* (C2, C3, C8, C9) Capacitor ceramic 100nF 10V or higher (TH or SMT 0805) - 4x
* (C6) Capacitor ceramic 100nF 25V or higher (TH or SMT 0805) - 1x
* (C7) Capacitor ceramic 2nF 25V or higher (TH or SMT 0805) - 1x

* (D1) 5mm LED (TH or SMT 0805) - 1x
* (Q1) N-MOSFET (SMT: BSS138P - SOT23 or TH: BS170G - TO92, or similar)  - 1x

* (U1) MCP4131-103 (DIP or SOIC) Digital potentiometer 10k - 1x
       Alternatively MCP4151-103 can be used as well.
* (U2) 74HC595 (DIP or SOIC) Shift register - 1x

* 24 pin narrow ZIF socket OR 24 pin DIP IC socket 0.1" pin spacing - 1x
* MT3608 module - 1x
* Square 7x7x12mm 6 Pin DPDT Mini Push Button Self-locking Multimeter Switch (YTSPS-22E70L, 2mm pin spacing) - 1x
* 40 Pin Male Single Row Strip 2.54mm Pin Header Connector 0.1" Straight - 1x
* Arduino UNO


OPTIONAL features
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on-board voltage booster (replacement for MT3608 module)

* (R10, R13 ,R14) Resistor 100k (TH or SMT 0805) 1% or better tolerance - 3x
* (R11) Resistor 4k7 (TH or SMT 0805) 0.25W, 1% or better tolerance  - 1x
* (R12) Resistor 3k3 (TH or SMT 0805) 1% or better tolerance - 1x
* (C10) Capacitor ceramic 1uF, 9V or higher (TH or SMT 0805) - 1x
* (D2)  Diode Schottky SK14, 1A 40V (SMT package DO-214AC-2 )
        or alternative TH Schottky diode 1N5818
* (L1)  Inductor 10uH, NLCV32T-100K-PF  (SMT package 1210)
        or alternative TH: AICC-02-100K-T Axial inductor
* (U3)  Voltage booster MIC2619 (SOT-23-6) with over voltage protection (OVP)
        or alternative MIC2250  (SOT-23-5) without OVP, R10, R11 and R12 not required
        or possibly TPS61040DBVR (SOT-23-5) without OVP - not tested yet

SPI-RAM: extra memory for UNO (not used ATM. Can be soldered later if needed)

* (R15, R16)  Resistor 10k (TH or SMT 0805) 5% or better tolerance - 2x
* (R17) Resistor 4k7 (TH or SMT 0805) 0.25W, 5% or better tolerance  - 1x
* (C11) Capacitor ceramic 100nF 10V or higher (TH or SMT 0805) - 1x
* (Q2,Q3) N-MOSFET (SMT: BSS138P - SOT23 or TH: BS170G - TO92, or similar)  - 2x
* (U4)  SPI-RAM 5V, 23LC1024, DIP or SOIC-8, alternative 23LC512 or 23LCV512 or 23LCV1024