Project ..... Capacimeter Inductance Meter |
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It measures capacitance from 0 to 0.1 uF and inductance from 0 to 10 nH with good precision (about 1% and depends on the tolerance of the sample capacitor Ccal. Furthermore, it must be ensured that the oscillator composed of L and C oscillates at 550 KHz and shown on the display in calibration position 55000). Unfortunately I forgot to write down the coil data so it is necessary to take an MF and wind the necessary turns (about 100 turns of 0.14 wire coil with ferrite core to obtain 82 uH). Jumper position: LK1 - ON.. serves to calibrate the coil to the exact value as mentioned at 55000 (if it remains at 00000 the circuit does not oscillate). LK2 - OFF LK3 - ON . If the backlit LCD is used as in my case, battery power is not recommended (it doesn't last long...). Photo below of the first version while on the left the photo of the final version. Upon request I can provide the .hex file for programming the Pic. |
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