I guess 2n, 2n ,BF can be substituted The following circuit enables me to measure inductance of the inductor labeled LX which is the inductance to be measured. The inductance meter adapter output is connected to a frequency meter and the inductance is calculated from the frequency. Hence you need a frequency meter and some calculation to get your inductor value. The frequency of the sine wave is a function of the unknown inductance and the four pF capacitors. The output sine wave is amplified by the second transistor and is then rectified by the capacitor and diode combination that Follows.

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I guess 2n, 2n ,BF can be substituted The following circuit enables me to measure inductance of the inductor labeled LX which is the inductance to be measured. The inductance meter adapter output is connected to a frequency meter and the inductance is calculated from the frequency. Hence you need a frequency meter and some calculation to get your inductor value. The frequency of the sine wave is a function of the unknown inductance and the four pF capacitors.

The output sine wave is amplified by the second transistor and is then rectified by the capacitor and diode combination that Follows. The rectified sine wave now having only positive excursions is buffered by the third transistor and is then fed to the 74ls Counter ic which is configured as a divide by counter. The output of the ic pin 6 and ground is connected to the frequency meter.

NOTES The regulator powers the IC and the last 2 transistors The circuit operates from a 9V battery which also feeds the regulator The Ic consists of two counters in one package of 14 pins hence you need just one. I programmed my calculator to get me the inductance value from the reading. A simple computer programme can do this as well. However the lower Values could have error due to the circuit including test lead inductance.

The circuit is that sensitive. I play with some tricks to get around this which I will discuss later if people are interested in the circuit. Thanks to Bernardo Dimacali for helping me put the equation in a good and clear form.

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## Simple 1.5 V Inductance Meter Circuit

If you have ever looked into your junk box and wanted to know the value of the unmarked parts, these simple circuits will give you the answer. The units are calibrated against a known part. Therefore, the overal accuracy depends only on the calibration values and not on the components used to build the circuits. Layout is non-critical - almost any construction technique will suffice. Wire-wrapping or point-to-point soldering may be used.

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## Inductance and capacitance meter adapter for DVM

Inductance and capacitance meter adapter for DVM This device is an addon to a digital or analog voltmeter. How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig. It works as an oscillator whose frequency is determined by the RC components R R5 and C C5 in feedback circuits. A two deck rotary switch S1 selects one of five measurement ranges. The transistor Q1 is used to amplify the signal to provide sufficient current through potentiometer R8 and a load circuit.