PIC based LC meter remake

LC meter is a handy device. Probably any hobbyist can find C meter on their multimeter while L meter is rare feature on common devices. If you feel that you need compact and reliable LC meter then check this one. This is actually slight remake of Phil Rice original LC meter that was designed quite some time ago. But this circuit seems to be time proved and can serve as good reference for new one. Among changes there is a Li-Ion battery that replaces 9V pack. So this needs a 5V voltage booster and charger circuitry to make it work. Mini USB connector were added to make charging easy. Also there were minor changes made to firmware where recalibration were fixed. Board was placed in to nice box and now looks really pro. Continue reading

PIC based accurate LC meter

LC meter is one of frequent embedded projects. It is simply because most multimeters don’t have an inductance meter and sometimes capacitance. You can always buy a better one where you can find these features but why not to build one even with better characteristics you may need. This LC meter operates as most LC meters – they are based on LC oscillator circuit. By measuring the frequency of serial or parallel LC circuit you can calculate unknown L or C value. As result this project is capable to measure inductance in range 0 nH to 10mH at resolution 2nH, capacitance from 0pF to 10uF at resolution 0.1pF. It has automatic calibration ability and autorange as well. This is great and practical project for any hobbyist. Continue reading