The inductance meter adapter circuit output is connected with a frequency meter and the inductance is calculated from the frequency. So, you will need a frequency meter and some calculation to get your inductor value. The circuit enables to measure inductance of the inductor which is the inductance to be measured. The operation of the circuit is built by a TTL square wave whose frequency relates to the inductance being measured. This the figure of the circuit;
How is the circuit work? The core of the circuit is the buffer colpitts oscillator(the first stage) which resonates with the unknown inductance to give a sinus wave of a particular frequency . The frequency of the sinus wave is a function of the unknown inductance and the four 1000pF C. The output sinus 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 74ls393. Counter IC which is configured as a divide by 256 counters. The output of the IC pin 6 and ground is connected to the frequency meter.
How is the circuit work? The core of the circuit is the buffer colpitts oscillator(the first stage) which resonates with the unknown inductance to give a sinus wave of a particular frequency . The frequency of the sinus wave is a function of the unknown inductance and the four 1000pF C. The output sinus 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 74ls393. Counter IC which is configured as a divide by 256 counters. The output of the IC pin 6 and ground is connected to the frequency meter.
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