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Offline leonardo
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« Reply #40 on: April 29, 2015, 09:59:27 pm »
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good results with admiral, I think coil is not right turns,detecting very close only...
a forum member has already set up?

Posted on: April 29, 2015, 09:56:03 pm
my English is bad'  i am Brazilian!portuguese language


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Offline bernte_oneTopic starter
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« Reply #41 on: April 30, 2015, 03:59:26 am »
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try to set rx coil so that you get an induced voltage lower than 10mV
fix the coil at this Point, check for right behaviour of coil, function of ground Balance (test with a pieces of ferrite)
and Disc. 100g hammer and a coin.

if this does not work
flip one part of the coil the tx OR the rx side - or just Change one Connection of connector from tx   OR rx, winding direction of tx and rx should be same direction

if this does not work too
try another cap value maybe at rx stage on pcb, to get better ratio of frequency difference between tx and rx

good luck

Posted on: April 30, 2015, 03:56:44 am
another Thing: your test coil Looks bad, loose winding  - fix them tightly and bring tx and rx coil in symetrical shape

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« Reply #42 on: April 30, 2015, 01:46:45 pm »
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Bernte_one is right. Get that coil tightly wrapped, then get it nulled, so as little as possible signal is in the secondary. Then take a coin and place it on the gap so as much signal as possible is seen on an oscilloscope. From there, remove rx cap from the board, hook a capacitor sub box across the coil and substitute different  caps until the signal cannot get any bigger. Put a cap on the rx board with that value. If you don't have a sub box, use individual capacitors. This is where the coil is most sensitive.

Dusty Carl

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« Reply #43 on: May 07, 2015, 09:34:09 am »
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Quote:Posted by leonardo
good results with admiral, I think coil is not right turns,detecting very close only...
a forum member has already set up?

Posted on: April 29, 2015, 09:56:03 pm
my English is bad'  i am Brazilian!portuguese language


Nothing wrong with the specs that you were given,  but you handiwork.

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Offline leonardo
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« Reply #44 on: May 14, 2015, 07:24:51 am »
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admiral ok

Posted on: May 14, 2015, 07:23:04 am
md admiral

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Offline xavier
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« Reply #45 on: May 14, 2015, 08:46:20 am »
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Good have you found thing with it yet?

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Offline bernte_oneTopic starter
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« Reply #46 on: May 18, 2015, 01:31:01 am »
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hello Leonardo,

Looks good, have you tested, can you make Video? Clapp

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Offline xavier
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« Reply #47 on: May 18, 2015, 04:19:01 am »
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Quote:Posted by bernte_one
hello Leonardo,

Looks good, have you tested, can you make Video? Clapp

Unfortunately a lot of new members come here get the build done, then you don't hear from them any more. I hope that it won't be the case here.

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Offline bernte_oneTopic starter
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« Reply #48 on: May 18, 2015, 09:43:08 am »
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hello xavier, tried to answer your pm  but your inbox is full
i have overworked dbp layout a bit and want to show it

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Offline xavier
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« Reply #49 on: May 18, 2015, 10:04:58 am »
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No my in box is not full mate, just cleaned it a few days ago.

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