Designator	Component	Number	Cost per unit-currency	Total cost-currency	Source of materials	Material type
Microcontroller	Arduino Uno	1	$29.95	$29.95	Amazon	Semi-conductor
Power supply	$\pm 15\text{V}$Voltage Supply	1	$7.75	$7.75	ebay	Other
Circuit board	Stripboard	$102{\mathrm{cm}}^2$	$$0.013/{\mathrm{cm}}^2$	$1.33	Amazon	Metal/Polymer
Sockets	Banana sockets	24	$0.39	$9.35	Amazon	Metal/Polymer
Power input	C14 socket	1	$0.59	$0.59	Amazon	Metal/Polymer
Wire	24awg solid	$1.05\text{m}$	$0.25	$1,05	Amazon	Metal/Polymer
Wire	24awg stranded	$7.60\text{m}$	$0.26	$2,01	Amazon	Metal/Polymer
Switch	SPST, mini	$2$	$0.89	$1.84	Amazon	Metal/Polymer
IC	LM324N	6	$0.60	$3.60	Amazon	Semiconductor
IC	LM1458	2	$1.6	$3.20	Amazon	Semiconductor
Electronic component	$5\text{V}$Voltage Regulator LM78L05	$2$	$0.08	$1.60	Amazon	Semiconductor
Relays	AS5W-K	$4$	$3.80	$15.20	ebay	Metal/Polymer
Resistor	$250\mathrm{\Omega }$	$1$	$0.06	$0.06	Amazon	Metal/Polymer
Resistor	$10\mathrm{k}\mathrm{\Omega }$	$6$	$0.06	$3.39	Amazon	Metal/Polymer
Resistor	$20\mathrm{k}\mathrm{\Omega }$	$4$	$0.05	$0.20	Amazon	Metal/Polymer
Resistor	$45\mathrm{k}\mathrm{\Omega }$	$4$	$0.014	$0.06	ebay	Metal/Polymer
Resistor	$47\mathrm{k}\mathrm{\Omega }$	$4$	$0.03	$1.20	Amazon	Metal/Polymer
Resistor	$100\mathrm{k}\mathrm{\Omega }$	$6$	$0.05	$0.30	Amazon	Metal/Polymer
Potentiometer	$10\mathrm{k}\mathrm{\Omega }$	$16$	$0.17	$2.72	ebay	Metal/Polymer
Capacitor	$1\mathrm{\mu }\mathrm{F}$	$4$	$0.08	$0.32	Amazon	Metal/Polymer