Electronic Circuit Project » Tester http://www.electronic-project-circuit.com For Electronic Hobbyist, Engineer, And Student Wed, 02 Dec 2009 04:16:17 +0000 http://wordpress.org/?v=2.8.6 en hourly 1 Simple Lie Detector http://www.electronic-project-circuit.com/simple-lie-detector/ http://www.electronic-project-circuit.com/simple-lie-detector/#comments Mon, 12 Oct 2009 00:26:50 +0000 admin http://www.electronic-project-circuit.com/?p=31 If you want to test someone telling you the truth or not, you can use this simple lie detector. It’s easy to build. You need transistor, electrode, resistor, capacitor and analog ampere meter. This lie tester works by measuring skin resistance which goes down when you lie. For electrodes, you can use alligator clips, electrode pads, or just wires and tape.

To use the circuit, first, attach the electrodes to the back of the subjects hand, about 1 inch apart. Secondly, adjust the meter for a reading of 0. Ask simple questions that you know he lying or not for calibration. After that ask your main question. You know the subject is lying when the meter changes.

Simple Lie Detector

source : http://www.hackcanada.com/ice3/wetware/lie_detector_circuit_2.html

]]> http://www.electronic-project-circuit.com/simple-lie-detector/feed/ 0 Logic Probe Tester With Audio http://www.electronic-project-circuit.com/logic-probe-tester-with-audio/ http://www.electronic-project-circuit.com/logic-probe-tester-with-audio/#comments Tue, 06 Oct 2009 05:53:23 +0000 admin http://www.electronic-project-circuit.com/?p=25 During testing circuit, it’s difficult use LED as indikator of logic probe. Another good option is using Audible Logic Probe. With this probe, Any input greater then 2 volts will be high and output a high tone through the speaker. Any input less then .8 volts will be low and produce a low tone through the speaker.

Audio Logic Probe


© randylinscott

This probe is designed for TTL circuits but you can modified for CMOS circuit. How to use it? Connect power source 5 volt to to Audible Logic Probe (you can use power source of circuit that being test). Clip the ground input of the probe to the ground of the circuit being tested. The other input lead is used to probe the different chips of the circuit being tested. The project use LM339 (comparator) as main component.

source : http://home.maine.rr.com/randylinscott/feb99.htm

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