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8th March 2010 17:24
How Can i calibrate circuit for 0-100uH and 25uH-200uH
1st April 2008 23:51
Bert,
It "just worked" for me when I tacked it together on the bit of IC socket. I built it on a solderless breadboard first to confirm it was OK, did three inductor swaps, but otherwise just chucked it together. Try the right Schmitt inverter chip and see if it works then?
I mainly use inductors < 8 uH so a resonance bridge I have tacked together on a fragment of PCB or the resonance meter based on Drew's design is what I generally use for inductor measurement, this meter hardly gets any use except for top-band receivers and ferrite chokes.
I have been using my tone dipper and the tiny C-jig or fixed caps for < 1 uH inductors a lot lately. I was considering building a fixed-tuned tone/regen with a varicap across a really tiny test fixture built around a peg or alligator clip for sub 200 nH inductors. I built the dipper circuit up but haven't got the mechanics of the fixture quite to my liking.
Regards,
Alan
1st April 2008 22:52
Hi again.
How do you connect it like this?
I can't even make the unit work ,although I tested it with two PCBs I have etched, purposely for this circuit. Any tips?
Before I make this inductance meter, I built a capacitance meter, using 74HC132 (it was just the same, but the Nand gate forced me to connect one more input to the Vcc, forming a Not gate(inverted buffer) like 74HC14.)
9th March 2010 21:45
Alan Yates wrote...