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Offline dlucaTopic starter
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« on: September 20, 2010, 01:19:12 pm »
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Hello, looking for on Internet a L/C meter to measure the coils, i found this web that have a very simple L/C meter to build with a pic.
The proyect is complete with the scheme, PCB board and calibration of the instrument.

Spanish version link:

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http://asterion.almadark.com/2009/11/09/inductometro-y-capacitometro-digital-version-2/


English version link:

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http://www.marc.org.au/


In the english version the designer use a 16F84 and a LM311 Amp Op, in the spanish version there is a modification in the scheme, they use a 16F628 and the LM311 is not used, because they use the internal comparator in the 16F628.
I hope this will be usefull for someone.


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Offline GoldDigger1950
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« Reply #1 on: September 20, 2010, 02:10:15 pm »
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Dluca, this one is a bit easier and costs only $21.88 including shipping. Ready to use out of the box.

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http://www.dealextreme.com/details.dx/sku.26768~r.69508068


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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline dlucaTopic starter
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« Reply #2 on: September 20, 2010, 03:04:40 pm »
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Ok, thanks for the information.
Very helpfull.
I look for it on ebay and with free shipping the cost is U$S25.56
Thanks again


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Offline Paul A
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« Reply #3 on: September 21, 2010, 01:30:47 am »
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Hi,
I like this one..... (actually pretty accurate too!)

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http://www.simplecircuitdiagram.com/2009/05/10/inductance-meter-adapter-circuit-turns-your-digital-voltmeter-to-inductance-meter/




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Offline GoldDigger1950
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« Reply #4 on: September 21, 2010, 01:52:52 am »
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The one I specified is cheaper and easier since you don't have to build it or own another meter. Why make it so hard?

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #5 on: September 21, 2010, 01:56:46 am »
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Maybe because some of us don't live in that particular country or:
Already have a MM and don't need another...


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« Reply #6 on: September 21, 2010, 04:04:12 am »
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And from what I can see the inductance is all wrong for us detector builders - Inductance: 20mH ~ 20H (100Hz) I build the one that Dluca posted the link to the only thing that I did to it was reduce the size of the board so that it would be the same size as the display works pretty well too. I posted it on the forum some time ago.

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http://thunting.com/smf/test_equipment_for_dity_projects/lc_meter-t13686.0.html


Best regards
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So many questions so little time
Offline dlucaTopic starter
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« Reply #7 on: September 21, 2010, 04:00:42 pm »
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Ok, Xavier.

I builded the inductance meter today and works fine for me, I tested an inductor of 100uH, and the measure in the instrument was 98.95uH, I think that this is a good presicion.
I will post pictures of the instrument.
Regards,

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Offline GoldDigger1950
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« Reply #8 on: September 21, 2010, 04:06:15 pm »
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Quote:Posted by Paul A
Maybe because some of us don't live in that particular country or:
Already have a MM and don't need another...


There are very few countries bereft of a post office but a lot of detectorists who build an item that works just like a $22.00 item for $50.00 and think they saved money when they also have to have a $50.00 multimeter to use their "bargain."

Paul, I merely suggested a very economical alternative to building one. Contrary to popular belief here on these forums, building one yourself is not always cheaper, better or faster. A wrongly connected component can result in a hundred posts here trying to fix it.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
Offline Paul A
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« Reply #9 on: September 22, 2010, 01:00:20 am »
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Granted...
But some of us just love making stuff!
I wouldn't think that would cost more than a few dollars.
Most of it in constructors "junk" boxes!


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