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  • This LC meter circuit can measure coils and capacitors. When Lx or Cx is connected in the circuit the oscillator frequency will decrease and this decrease is measured by a frequency-voltage converter build with T3 and T4. To adjust this lc meter circuit with P1 and P2. LC meter precision is 3%.
    Scale calibration can be achieved with this formula: ni = nm(1 – fr)/(1 – fc) where ni is number of divisions measured on the scale, nm = total number of division of the scale, fr = relative frequency, fc = the smallest relative frequency measured.

    The total power consumption is 12mA at 12V when the LC measurement occur.

    LC meter circuit diagram

    lc meter circuit schematic

    Coil Capacitor meter schematic components


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    7 Responses to "LC Meter Circuit, Coil Capacitor Meter"

      • J. Winter says: on November 18, 2009 at 9:59 pm

        Almost exact copy of diagram is in the book: “Schaltbeispile mit diskreten Halbleiterbauelementen”, ITT (1972)

    1. Carlos Chan says: on October 17, 2009 at 7:38 pm

      Bien por la información, buen desarrollo del circuito. Vy a armarlo y te diré que tan efectivo es. Saludos.

    2. obsolete

    3. Mujtaba Ali says: on July 21, 2011 at 6:12 pm

      Sir u know how to design a transformer,there formulas?
      E=4.44fФN Here Ф=Bm*A (In Tesla or Weber/m sq)
      Bm=Flux Density of core which we use as low magnetic reluctance path.
      basicaly every designer stops at this point,bcoz he has no idea about the quantity of flux density of material that how many magnetic lines of force will passes through in it.In short plz tell me simple formula to design tranformer & flux density of iron core material in teslas?Thanks

    4. sir,
      how to design an lc meter for impedance matching?

    5. Sir, it can be used in measuring capacitance of metal??

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