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Wire Tracer Circuits
Last Updated on:
Saturday, April 14, 2012 06:34 AM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Beeper to find short circuits - 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....(electronic design added 6/07) |
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Broken coil detector is simple yet robust - 4-Mar-10 Issue of EDN
An oscillator, filters, and comparators detect missing wires in an assembly
line.... [Design Idea by Juan Pablo Caram, Santiago, Chile] |
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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 guides, contain small magnets and
compasses that act as sensor elements.... [Design Idea by Luis Miguel
Brugarolas and Manuel Ramón, Sire Sistemas y Redes Telematicas, Tres
Cantos, Madrid, Spain] |
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Circuit tests VCOM drivers - 11-Nov-04 Issue of EDN 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.... [Design Idea by Soufiane Bendaoud, Analog Devices, San
Jose, CA] |
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Design makes handy audible circuit tracer - 9-Jan-03 Issue of EDN 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.... [Design Idea by Jerry O'Keefe, Cupertino, CA] |
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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.…. [Tony van Roon's circuit] |
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In Circuit Transistor Checker - It is able to check transistors, in the
circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can
also check the output power transistors on amplifier circuits….(added 04/05/06)
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INSIDER V10 - In-Circuit debugger, created by E.E. Atanasios Melimopoulos.
Updated Ver 1r1 (circuit added 2/09) |
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Quickly find PC-Board shorts with low-cost tracer technique - 25-Nov-04
Issue of EDN 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.... [Design Idea by Teno P Cipri, Engineering Expressions Consulting] |
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Short-Circuit Finder uses Few Parts - 11-Nov-98 Issue of EDN 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,....Note File has several circuits, scroll to find this one....
[Design Idea by Boris Khaykin, Candid Logic Inc, Madison Heights, WI] |
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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. [Andy Collison] |
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Signal Tracer - The main part of this circuit is the LM386 amplifier chip.
It also uses a transistor input to buffer the input signal and provide extra gain for
the LM386. The little unit has helped me out on numerous occasions when trouble
shooting any amplifier circuit like a stereo receiver, tv / vcr audio section, radios,
cd players and car stereos…. [Randy Linscott, designer] |
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Simple scheme detects shorts - 07/08/99 EDN-Design Ideas....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,....[File contains multiple circuits. Scroll to find this one.].... [Design
Idea by Luis Miguel Brugarolas, SIRE, Madrid, Spain] |
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Wire tracer - Schematic only, no circuit description |
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Wire Tracer
Circuits
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