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Wire Tracer Circuits
 

Last Updated: November 30, 2017 07:38 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Beeper to find shorts -  This circuit uses two 741s or equivalent op amp to form a beeper that is used to detect short circuits.  This design offers a way to trace resistance in the milliohm range, right to a short between bridged traces beneath a solder mask.  A1 is configured as a multivibrator.  R1 and C1 determine the frequency of oscillation and __ Contact IQ Technologies

Broken-Coil Detector Is Simple Circuit Yet Robust -  03/04/10  EDN Design Ideas:  The circuit in this Design idea was originally designed to detect damaged conveyor belts in the mining industry.  Thin coils are embedded in the conveyor belt.  if the belt suffers damage, it stretches at the affected location, causing one or more coils to break.  The method for detecting the broken coil is to allow a “sensing” coil to magnetically couple with the passing coils in the belt, thus changing the total inductance of the magnetic pair.  The sensing coil is part of an LC oscillator (Figure 1).   __ Circuit Design by Juan Pablo Caram, Santiago, Chile

Cable finder seeks out wall conduits -  05/11/00 EDN Design Ideas:  When you debug home electrical wiring, a tool that determines the location of cable conduits comes in handy, especially when problems arise.  Some tools, such as nylon or glass fiber guide as, contain small magnets and compasses that act as sensor elements __ Circuit Design by Luis Miguel Brugarolas and Manuel RamĂłn, Sire Sistemas y Redes Telematicas, Tres Cantos, Madrid, Spain

Cable Tester Uses LEDs to Find Faults -  22-Oct-09 EDN Design Ideas:  Test as many as 16 wires with LEDs as continuity indicators __ Circuit Design by Pavel Šádek, Apri, Roznov pod Radhoštem, Czech Republic

Circuit tests VCOM drivers -  11-Nov-04 EDN Design Ideas:  Flat-panel LCD monitors offer excellent image quality andcompact form factor than CRTs—hence, their steadily increasing popularity.  Unfortunately, the complexity of their manufacturing process makes LCD monitors considerably expensive than CRTs.  The amplifier that drives VCOM, the voltage on the backplane of the LCD panel, must be able to drive large capacitive loads, deliver h __ Circuit Design by Soufiane Bendaoud, Analog Devices, San Jose, CA

Design Makes Handy Audible Tracer -  01/09/03 EDN Design Ideas:  The circuit tracer in Figure 1 is a handy tool for finding connectivity paths on a pc board.  Because the sense voltage you use to measure the path is lower than a transistor's VBE voltage, you can use the design in circuits containing semiconductor elements without affecting the measurement.  The tracer's output takes the form of audio tones __ Circuit Design by Jerry O'Keefe, Cupertino, CA

Detect wire breaks with unusual CMOS gate -  02/10/14 EDN Design Ideas:  TDR in the shop? Try this circuit to detect a wire break.  CMOS devices have large input impedance with input currents on the order of 0.01nA.  Adding feedback circuitry can result in a latch-like device that can be used to store bits, and also operate in a more analog mode as shown in this Design idea, which pinpoints the location of a break in a wire.   __ Circuit Design by Raju Baddi

Electroluminescent Wire Sequencer -  Assembly and Operation of the SEQ5 ELWire Sequencer __ Designed by John DuBois

Evolved-Analysis Technique Provides Greater Insight -  12/05/96  EDN Design Ideas:  Circuit-analysis techniques often fail to provide true insight into network design.  A previous EDN article (Reference 1) introduced the Extra Element Theorem (EET) and gave designers a powerful circuit-analysis technique that provide as useful symbolic results.  The article highlighted EET specialized to an impedance function and applied it to a bridge circuit with a voltage-dependent current source, but the article stopped short of explaining why the method works.   __ Circuit Design by Celestino A Corral, Scientific-Atlanta Inc

Fleapower Detects shorts -  07/02/98 EDN Design Ideas:  (FILE
has several circuits, please scroll to find this one) Sometimes, the need arises for a short-circuit tester that supplies a low current to the device under test (DUT) and also uses voltages lower than 100 mV to prevent conduction of semiconductors.  The circuit in Figure 1 meets these requirements.  R1 limits the current in the DUT to 0.9 mA.  The voltage on the DUT can not exceed the value set by the ratio R2/ (R1+R2).  The NE5230 micropower op amp compares the voltage on RX (representing the DUT) with the voltage at the junction of R3 and R4.   __ Circuit Design by W Dijkstra, Waalre, The Netherlands

Fox & Hound Wire Tracer -  The "Fox" and "Hound, " made by Triplett Corporation (www.  triplett.  com) , are a transmitter and receiver for tracing telephone (and others) wires through walls.  You connect the transmitter to the wire, and the receiver helps you trace the wire from several inches distance away.  Triplett doesn't say much about how they work, but th Fox and Hound apparently use inductive coupling of a low-frequency signal, maybe around 50 to 100KHz __ Designed by Tony van Roon  VA3AVR

Hot-Swap Structure Offers Improved Redundancy -  01/09/03 EDN Design Ideas:  For redundancy purposes, a number of power supplies, using ORing diodes, can work into the same load.  During maintenance, when you can remove any power supply, the minimum possible power perturbation at the load is desirable.  To compensate for the voltage drop across the ORing diodes, you must connect the power-supply feedback lines after the diodes, at the load __ Circuit Design by Samuel Kerem, Corvus Corp, Columbia, MD

Induction receiver for tracing wiring behind walls, hearing lightning & other electric discharges -  The induction receiver shown below is very sensitive and can serve a variety of purposes.  it is excellent for tracing wiring behind walls, receiving audio from an induction transmitter, hearing lightning and other electric discharges, and __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

INSIDER V10 -  in-Circuit debugger, created by E.  E.  Atanasios Melimopoulos.  Updated Ver 1r1 __ Designed by Jose Pino

Milliohm Squawker great at finding shorts & reverse engineering PCBs -  05/23/14  EDN Design Ideas:  This well thought out tool for “listening to” low resistances really speeds troubleshooting & tracing.   __ Circuit Design by Glen Chenier

Quickly find PC-Board shorts with low-cost tracer technique -  25-Nov-04 EDN Design Ideas:  A predominant failure mechanism for production pc boards is shorted traces.  Finding hidden shorts is often time-consuming and frustrating.  Typical techniques of cutting traces, lifting pads, and "blowing" shorts are, at best, questionable because they may affect the reliability of the circuit, and the ever-decreasing geometries and lower voltage ICs  make these practices tricky and risky __ Circuit Design by Teno P Cipri, Engineering Expressions Consulting

Scheme Detects shorts -  07/08/99  EDN Design Ideas:  NOTE:  File contains multiple circuits.  Scroll to find this one.  When you manually assemble complex boards, it’s common to short-circuit adjacent component or IC pins.  Determining which section of the circuit you have shorted is not too difficult, but finding the precise point where the short exists can be a formidable task, because the short may be under a surface-mount component. __ Circuit Design by Luis Miguel Brugarolas, SIRE, Madrid, Spain

Short tracer/finder uses low power -  9/07/2014-EDN Design Ideas:  Build this bench tool and become a master at pinpointing shorts.   __ Circuit Design by Dan Meeks

Short-Circuit Finder uses Few Parts -  11/05/98 EDN Design Ideas:  (File contains several ciruits.  Scroll to find this one) The simple tester in Figure 1  detects short circuits on assembled pc boards and also rings out cables and harnesses.  The short finder has a narrow zone of threshold uncertainty and very low "insertion" voltage and current, and it's not confused by capacitors.  The circuit uses an LM10, an IC that combines a precision 200-mV reference,  __ Circuit Design by Boris Khaykin, Candid Logic Inc, Madison Heights, WI

Signal Injector / Tracer -  A simple test circuit to fault find audio and radio equipment.  Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer.   __ Designed by Andy Collison

Simple Circuit Scheme Detects shorts -  07/08/99  EDN Design Ideas:  NOTE:  File contains multiple circuits.  Scroll to find this one.  When you manually assemble complex boards, it’s common to short-circuit adjacent component or IC pins.  Determining which section of the circuit you have shorted is not too difficult, but finding the precise point where the short exists can be a formidable task, because the short may be under a surface-mount component. __ Circuit Design by Luis Miguel Brugarolas, SIRE, Madrid, Spain

Test VCOM Drivers -  11-Nov-04 EDN Design Ideas:  Flat-panel LCD monitors offer excellent image quality andcompact form factor than CRTs—hence, their steadily increasing popularity.  Unfortunately, the complexity of their manufacturing process makes LCD monitors considerablyexpensive than CRTs.  The amplifier that drives VCOM, the voltage on the backplane of the LCD panel, must be able to drive large capacitive loads, deliver h __ Circuit Design by Soufiane Bendaoud, Analog Devices, San Jose, CA




Wire Tracer Circuits


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