Simple Lie Detector Circuit

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STD Simple Lie Detector Circuit

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Update time： 2021-04-10 14:05:30

Creation time： 2017-11-21 11:52:43

Description

The concept behind this **Lie Detector Circuit** is that, we assume when a person lie he kind of pumps up his anxiety level which makes him sweat and develop moisture on his skin. We then use this piece of circuit to detect if there is moisture on his skin and based on the result we glow and LED, a green one for truth and red for lie. Of course yes this cannot be claimed as a lie detector, but you can use this to play with your friends and have fun. More than that you get to learn stuff

Design Drawing

schematic diagram

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Lie Detector Circuit Diagram
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PCB

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Lie Detector Circuit PCB layout
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	BC547A	Q1,Q2,Q3	TO92-INLINE	3
2	470	R1	AXIAL-0.3	1
3	50k	R2	RES-ADJ_3386P	1
4	LED	D1,D2	LED5MM	2
5	47k	R3	AXIAL-0.3	1
6	10k	R4	AXIAL-0.3	1
7	100nF	C3	RAD-0.1	1
8	1M	R6,R5	AXIAL-0.3	2
9	Header-Male-2.54_1x1	P1,P2	.032AUTO-LG-PAD	2
10	Header-Female-2.54_1x2	P3	PCB 2 pole screw terminal block 2.54	1