If you are a fan of the crime drama, then you will certainly love this, I have always been curious of the legitimacy and accuracy of the lie detector, most of the times bewitched by how to apply it, and the criminals who some how manage to beat the device, but that's another story. I found how easy it is to make one of my own. So using some old discarded parts I had lying around from old computers, I pushed forward to build my very own device.
Here's how to make a fun, cheap lie detector that really works! Find out if your friend or spouse is lying. This Homemade lie detector machine is just for your fun. You will need some electronic knowledge to do this. The video explains how to assemble the circuit with a block diagram.