A design by Phil Rice VK3BHR. Author Language & Web Site Marek SP7DQR Polish .
Post on 01-Apr-2015
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A SURPRISINGLY ACCURATE DIGITAL LC METER
”I DIDN'T EXPECT IT TO WORK SO WELL!”
A design byPhil RiceVK3BHR
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
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 0.1uF
Inductors - 0.0uH to somewhere over 10mH
All Thourgh Hole and NO SUFACE MOUNT
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
The Mathematicsbehind the scenes.
Parallel LC oscillator& Frequency Meter
Origional Design
Improved Version 2https://sites.google.com/site/vk3bhr/home/index2-html
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.
Component Layout
Variations in Artwork
http://kc7zow.tripod.com/hamradio/id8.html
http://f6bon.albert.free.fr/LCMETER2.pdf
Variations in Schematics
http://www.aade.com/manuals/lcm2b%20kit.pdf
http://f6bon.albert.free.fr/lcsch.pdf
Variations in Implementation
http://kc7zow.tripod.com/hamradio/id8.html
http://www.aade.com/lcmeter.htm
http://py2wm.qsl.br/LC_meter/LC_meter-e.html
http://f6bon.albert.free.fr/lcmetre.html
http://www.pi4zlb.nl/Zelfbouw/LC-meter.html
http://xavier.fenard.free.fr/LCMeter.htm
http://electronics-diy.com/lc_meter.php
http://www.marc.org.au/
http://py2wm.qsl.br/Gravador_PIC/pic-programmer.html
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…
Express PCB Schematic
Express PCB Layout
Bill of Materials
Front Panel Artwork& Drilling Template
Board by Chris Hood, KE5SBP
Completed Board and Display
Drilled Case and Mounting Hdw.
Completed Meter
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