A Surprisingly Accurate Digital LC Meter ”I didn't expect it to work so well!”
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Transcript of A Surprisingly Accurate Digital LC Meter ”I didn't expect it to work so well!”
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A SURPRISINGLY ACCURATE DIGITAL LC METER”I DIDN'T EXPECT IT TO WORK SO WELL!”
A design byPhil RiceVK3BHR
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Available in Different Languages on the web.
Author Language & Web Site Marek SP7DQR Polish
http://sp7dqr.waw.pl/lcmeter_pl.html Aleksandr Buyevskiy Russian
http://www.cqham.ru/lc_meter.phtml Patrick TK5EP French
http://tk5ep.free.fr/tech/lcmeter/fr/lcmetre_f.php Volker SM5ZBS
German http://www.janson-soft.de/lcmeter/lcmeter.htm
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FeaturesPic Based design with software calibration.
http://en.wikipedia.org/wiki/PIC_microcontroller
Low Part Count.Simple to use.Battery Powered.Locally available parts.Claimed measuring range:
Capacitors - 0.0pF to about 0.1uFInductors - 0.0uH to somewhere
over 10mHAll Thourgh Hole and NO SUFACE MOUNT
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Claimed measuring range
Small measurements are inaccurate,because of quantising error.
Capacitors - 0.0pF to about 0.1uF
Inductors - 0.0uH to somewhere over 10mH
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The Mathematicsbehind the scenes.
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Parallel LC oscillator& Frequency Meter
Origional Design
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Improved Version 2https://sites.google.com/site/vk3bhr/home/index2-html
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It differs from the original in that:
A 16F628 PIC is used. This has internal comparator, which means the LM311 is no longer needed.
Software calibration is used. The finished meter can be calibrated against "any" accurate capacitor within the range 100pF to about 10000pF.
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Component Layout
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Variations in Artwork
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http://kc7zow.tripod.com/hamradio/id8.html
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http://f6bon.albert.free.fr/LCMETER2.pdf
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Variations in Schematics
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http://www.aade.com/manuals/lcm2b%20kit.pdf
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http://f6bon.albert.free.fr/lcsch.pdf
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Variations in Implementation
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http://kc7zow.tripod.com/hamradio/id8.html
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http://www.aade.com/lcmeter.htm
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http://py2wm.qsl.br/LC_meter/LC_meter-e.html
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http://f6bon.albert.free.fr/lcmetre.html
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http://www.pi4zlb.nl/Zelfbouw/LC-meter.html
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http://xavier.fenard.free.fr/LCMeter.htm
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http://electronics-diy.com/lc_meter.php
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http://www.marc.org.au/
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http://py2wm.qsl.br/Gravador_PIC/pic-programmer.html
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Build Process
Redrew schematic in ExpressPCB with Mouser Part numbers.
Redrew layout with changes for new parts.
Extracted Bill of Materials from the schematic.
Upload to Mouser and make any changes for items you have.
Print PCB layout and etch the circuit board (Iron on process).http://www.staples.com/Staples-Color-Laser-Paper-Glossy-8-1-2-inch-x-11-inch/product_633215
This is still a work in progress…
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Express PCB Schematic
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Express PCB Layout
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Bill of Materials
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Front Panel Artwork& Drilling Template
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Board by Chris Hood, KE5SBP
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Completed Board and Display
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Drilled Case and Mounting Hdw.
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Completed Meter