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Offline silverdog
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« Reply #20 on: May 05, 2010, 04:03:41 am »
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fairly basic I guess, I do have a multimeter and an lc meter, and am measuring from circuit ground to various points - just have no reference as to what to expect at ic inputs etc

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« Reply #21 on: May 05, 2010, 08:05:20 am »
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Mudflap I couldn't agree with you more

6666 here is the first test that I did today but I'm still not happy have to change the top section

Silverdog could you post us a few pic's of your PI

Regards Xavier

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« Reply #22 on: May 05, 2010, 10:40:25 am »
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I will post some pictures when I get it working, some help would be good though

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« Reply #23 on: May 05, 2010, 01:53:40 pm »
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 Shocked Why the heck do you think that I want some Pic's I want to see the PCB top and bottom so that we can tell you where to test and what to check

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« Reply #24 on: May 05, 2010, 05:50:07 pm »
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Thanks Xavier, be interested to see your change in the top

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« Reply #25 on: May 05, 2010, 07:14:40 pm »
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Nice coil Xavier. I built a discriminating detector using a 2 coil scheme and the receiver coil had a fair number of turns of #30. Can't tell ya how many I wound and when did the soldering the wire broke  Thumbs Down. Finally got a good one and added a Faraday shield and over laid it on the larger transmit coil. Still have the little unit. Its good for about 4 inches on a dime...

Jim

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« Reply #26 on: May 06, 2010, 02:12:26 am »
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Hi Mudflap

Here is my test coil what I did was to work out the length of wire that I needed for the coil from 43 turns and 230mm od I got 31m I then measured the 31m of wire and wound it I ended up with 60 turn's but it would have been better if I had known the inductance of the coil any how here is a pic of it. As for the top section I need to find the material for it so it will just have to wait a while. You can see on the pic that there is a problem with the winding of the coil and that is because the top section flexes I'm hopeful to find a piece of aluminum plate of 8mm thick 400x400 mm then by using proper shim stock instead of cardboard as a spacer for the wire gauge I will be able to produce good quality coils just for interest sake the wire that I used here is 19 AWG

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« Reply #27 on: May 06, 2010, 02:41:38 am »
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xavier, ok thanks I'll try and get some pics later, only got a mobile phone camera though
voltage at tp of ic9 is correct , voltage at tp of ic10 is now positive, not negative ?  -  lost output to speaker as well

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« Reply #28 on: May 06, 2010, 02:52:55 am »
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IC 10 is an op-amp's and is the one that will give you an audio out so is IC9 it's possible that your IC is shot but first you will have to look at all the voltages from the regulators and see if they are correct then work your way from there send some pic's it will make a big difference. And don't put till later what you can do now

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« Reply #29 on: May 06, 2010, 11:42:11 pm »
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Xavier, the problem with a flat coil versus a scatter wound coil is that the diameter of the coil changes throughout the windings. The only way to measure the inductance is to use a meter or to wind it after using a nonlinear formula for the diameter.

Also, you may not be aware of the field pattern from an air wound coil. The field will be destroyed by each successive winding on your flat wound coil. An antenna with such a patter will receive a better signal that way but the field developed during the transmit cycle will be less than 25% efficient compared to a scatter wound coil.

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« Last Edit: May 06, 2010, 11:45:50 pm by GoldDigger1950 » 		Logged
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