LC meter

LC meter based on LM311 and PIC16F84 micro controller. 0.0pF – 1uF and 0.0uH – 0.5H range. Quite precise meter.

My Machtech tester is capable of metering the capacitors, but is very complicated to measure short lead capacitors, not speaking about SMD ones. Also, I needed to measure the coils. In I found some LC meter schematics. It was quite interesting and capable to measure very small values. It is based on the LC generator frequency difference when additional capacitance or inductance is attached. The only precise element in the meter is capacitor. Also, it is possible to use trimmer and set the meter to required level of precision.

The meter is based on LC generator on LM311 and microcontroller PIC 16F84 (16c84). The indicator- standard alphanumeric LCD display. From old Hagenuk cable detector I removed very nice LCD displays with big numbers and symbols. They are as twice as big as normal. The internal jumper JP1 is used to switch meter from nanofard mode to microfarad. It is useful for old schoolers ­čÖé

The meter under the construction:

LC meter

Original schematics are in the author pages.
Preview of the schematics:

LC meter circuit diagram

I’ll place this meter and other stuff to standard 19″ rack from some old switch. There is original PSU from the switch. It gives me all needed voltages and is quite powerful.

According to mine idea there will be: LC meter, frequency meter, wide range high frequency functional generator with sweep option.

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3 Responses to LC meter

  1. AjayGhosh says:

    I am interested in this project
    Please mail me the source code
    Thank you

  2. Check for original source. And maybe my Lithuanian blog for more info: (in the comments)

  3. Ravi says:

    Dear sir,
    I feel your LC meter project is very good. I hope to make this LC meter.
    IF you like it, please mail me the source code & schematic diagram.
    Thank you.

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