Presentation on theme: "A design by Phil Rice VK3BHR"— Presentation transcript:
1 A design by Phil Rice VK3BHR A Surprisingly Accurate Digital LC Meter ”I didn't expect it to work so well!”A design byPhil RiceVK3BHRAmateur Radio magazine, April 2004
2 Available in Different Languages on the web. Author Language & Web SiteMarek SP7DQR PolishAleksandr Buyevskiy RussianPatrick TK5EP FrenchVolker SM5ZBS German
3 Features Pic Based design with software calibration. 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
4 Claimed measuring range Small measurements are inaccurate, because of quantising error.Capacitors - 0.0pF to about 0.1uFInductors - 0.0uH to somewhere over 10mH
8 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.
26 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).This is still a work in progress…