2
Digital LC Meter Version ll
An "improved" inductance/capacitance meter by Phil Rice, VK3BHR & Bob Innes, ZS6RZ.
A great economical test instrument to have!
Specifications:
Ø Inductance: 0.15uH to 200mH
Ø Capacitance: 0.1pF to 1uF (non-electrolytic!)
Ø Self-calibrating: Upon switch-on
Ø Display: In pF, nF or uH, mH
Ø Power: Any voltage between 9 and 12VDC (Unit has a built-in regulator)
This unit has been compared with an HP Inductance meter, and found to be extremely accurate, in spite of being so simple.
It differs from the original in that:
· A 16F628A PIC is used instead of the old discontinued PIC16F84A. The PIC16F628A has an internal comparator, which means the LM311 is no longer needed.
· Software calibration is used. The finished meter can be calibrated against "any" accurate 1% capacitor within the range 100pF to about 10000pF.
· A capacitor is supplied to calibrate the meter. Capacitance is marked.
Great for QRP’ers when building your own radios and also for the vintage radio guys when re-furbishing.
The amount of stray capacitance and inductance in the test leads is subtracted from the final reading.
See my website for more info and pricing!
Bob Innes...... ZS6RZ BiCraft Electronics 15th Aug, 2015
Mobile Phone: 083 625 0294 (Business hours only)
Email: Website: http://www.jbcs.co.za/ham_radio/bobi_index.html