Lie Detector Electronic Kit and Circuit Explanation
We’ve had a few emails and posts about folks who wanted to build their own lie detector, here’s one (and how it works) – “The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five resistors (R1 to R5), and a variable resistor (VR1). Suitable transistors to use are BC547, BC548 or BC549, or any other small NPN transistor. The Lie Detector circuit works based on the fact that a person’s skin resistance changes when they sweat (sweating because they’re lying). Dry skin has a resistance of about 1 million ohms, whereas the resistance of moist skin is reduced by a factor of ten or more.” Link.
Harvey writes “Where US Taxpayer’s have already bought the best equipment (Like $2,000 hammers) and you can pick up it up for a faraction of its original cost. Get electronics and test equipment, pumps and motors, battaries and computer equipment by the pallet! Buy entire pallets of parts at a time and make the impractical dream a reality! NOTE: Read the fine print and watch out for shipping costs!”
Jason from Preshrunk writes “The gang over at Vestal Design have made and documented a really killer bar made out of somewhere in the neighborhood of 700 discarded library books. Well, I know I’d totally make one if I had that many books laying around.”
Excellent set of photos of the construction of cigar box guitars from Pasque – “I am building guitars out of cigar boxes with my students. Here are some photos of the prototype I built at home (now updated with photos of my students’ guitars). I went begging and got a bunch of wooden fingerjointed cigar boxes. The fee… a photo of my students with their guitars, a fair trade. The project idea came from Make magazine
Ian writes “This ‘instructable’ covers my new design that programs 8/14/18/28/40 pin PICs. The circuit is based on the
“This project combines an Apple iPod with a T+A-hifi stereo system (R-system). The iPod can be plugged into the stereo system and does not only deliver the Audio-signal to the T+A-system but is also remote controllable with the T+A remotecontrol without an own infrared receiver.The following iPods are supported: All iPods with dock connector, but not the iPod Mini!”
Chris has a how to on cleaning equipment that has water damage – “…I noticed the white calcium rings on the box and on the transformer, something had been dripping into it. Apparently it had rained quiet hard a couple of days earlier and water had dropped in from the balcony through a crack in the concrete and dropped down on the Linksys.”