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Summary of Contents for Elenco Electronics K-44
- Page 1 LIE DETECTOR KIT MODEL K-44 Assembly and Instruction Manual Elenco Electronics, Inc. Copyright © 2003 Elenco Electronics, Inc. 753116...
- Page 2 If you are a student, and any parts are missing or damaged, please see instructor or bookstore. If you purchased this Lie Detector kit from a distributor, catalog, etc., please contact Elenco™ Electronics address/phone/e-mail is at the back of this manual) for additional assistance, if needed.
- Page 3 IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors. BAND 1 1st Digit Color Digit Black Brown Orange Yellow Green Blue Violet Gray White IDENTIFYING CAPACITOR VALUES Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or mF (microfarads). Most capacitors will have their actual value printed on them.
- Page 4 CIRCUIT OPERATION The heart of the Lie Detector is the 555 IC. The 555 timer has become one of the basic and extremely successful chips in the semiconductor field. Understanding this device will prove most helpful, as you will surely encounter its use many times in the future.
- Page 5 CONSTRUCTION Introduction The most important factor in assembling your K-44 Lie Detector Kit is good soldering techniques. Using the proper soldering iron is of prime importance. recommended. The tip of the iron must be kept clean at all times and well tinned.
- Page 6 ASSEMBLE COMPONENTS TO THE PC BOARD D1 - LED (light emitting diode) (see Figure A) VR1 - 900kW Trim Pot (see Figure B) U1 - 8-pin IC Socket U1 - LM555 Integrated Circuit (see Figure C) C1 - .02mF or 0.22mF (203 or 223) Discap R1 - 1MW 5% 1/4W Resistor (brown-black-green-gold)
- Page 7 ASSEMBLE COMPONENTS TO THE PC BOARD (continued) Speaker Remove the backing from one side of the speaker pad and then attach it to the speaker. Remove the second backing and attach the speaker to the PC board as shown. Solder the speaker wires to points A and B on the the PC board as shown.
- Page 8 OPERATION Turn the unit on, set to LOW or HIGH mode. Hold one washer in each hand using your thumb and index finger. The speaker sounds as the LED flashes. Now squeeze the washers harder, the frequency should increase. galvanic skin resistance lowering due to stress. The kit is ready for use.
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