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792 B

QuantityManufacturer Part #Digikey Part #Notes
1STS1024S6V51470-4725-ND Switching Power Supply
1SGAS711800-3802-ND Flammable gas sensor ($30)
1A000005 1050-1001-ND arduino nano
2TC33X-2-104E TC33X-2-104ECT-ND100K potentiometer (TY53SL)
2CR0805-FX-2003ELFCR0805-FX-2003ELFCT-ND200K resistor 0805
2TC33X-2-105ETC33X-2-105ECT-ND 1M potentiometer
2CL21A106KAYNNNE1276-2891-1-ND 10uf ceramic for switcher
1C3216X5R1E476M160AC 445-8047-1-ND 47uf capacitor for switcher. This is somewhat high price, may not be needed (data sheet says optional)
case is 1593ARBK buy from newark or other
this bom assumes you have 1K 0805 and 0805 LEDs stocked (buy a reel), as well as reverse voltage diode and speaker, and female pin headers, terminal blocks, and barrel plugs