Need someone to assemble a the circuit board I'm unable

 Ok, Here's da scoup !   111 turns got me in the Ball Park  with 5.5uH , on the low side of the needed 6.5uH.   Was able to get it spot on as per my  Chines meter to the required 6.5uH needed for the Rx Coil.  That will change after I apply some yet to be obtained Spiral Wrap.  I did hit it with some White Krylon spray paint to work as a adhesive and keep things from moving so much.   Waiting for the Krylon to Dry and then I will LIGHTLY wrap it with some Teflon Plumbers Tape and measure again.  
 I may do without the Spiral Wrap.  

  Now if I can manage to do this well on the Tx Coil or at least keep the .5uH separation needed I'll be most pleased.  
 

Posted on: December 11, 2017, 06:05:21 pm

---

I use sand paper to do the Stripping.   This thin wire doen't like being bent in more then a few times ether.  

I wrapped coil with the Teflon and things did change a bit but not as expected.  The uH went down.  LOL  Now getting like 6.367.  I'll play at wrapping some more Teflon tighter and see if I can get it back up. I'm good with that.  I can make up the difference on Tx  if needed and still be  will in the 14Khz Tx.  

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,65709.msg321917.html#msg321917

LOL, NO.   Makes little difference .  Actually only a few points.   I tried that too.   The Inductance  goes UP if there is enough metal.    The Geometry makes  way more effects.   I can get it back to the required 6.5uH by opening the coil about a inch or so.


Outside Coil, Inside Coil,  and Coil opened a bit more.



Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,65709.msg321923.html#msg321923

Not so sure this .2mm wire is going to work as advertised.  Having issues getting it to sing on the Tx Oscillator.  Tx Oscillator is suppose to be outputting 16 volts.   Not measured yet.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,65709.msg321946.html#msg321946

		Quote:			Posted by Mudflap
	Be careful when stripping the enamel off that for soldering........ Dosen't take much to break it........      voice of experience....

Hi there, just an engineer here, previous experience working on radio circuits, CNC, motor and stator coil windings etc. Figured I should mention a tip for removing that enamel. You can simply expose it to a naked flame with a pocket lighter or the stove, providing you don't keep it there for long, I recommend picking up some generic plumber's flux if the solder won't stick great, de-oxidises the surface allowing a better meld of copper and tin. Alternatively, a decent soldering iron with a large heat mass, will quite easily melt the enamel off if you leave the wire inside the blob of solder for a few seconds, it should start to melt then boil off, leaving you with a nice tinned surface.

Best regards
DK

Posted on: December 25, 2017, 11:37:06 am

---

		Quote:			Posted by homefire
	Not so sure this .2mm wire is going to work as advertised.  Having issues getting it to sing on the Tx Oscillator.  Tx Oscillator is suppose to be outputting 16 volts.   Not measured yet.

Another bit of help if I can offer any, I'd try to find suppliers that offer fine tolerance wire, this will cost a tad more but try to look for smaller tolerances, sometimes called "Radio Grade", the cheaper wires tend to be mainly for motor windings which don't need an awful lot of accuracy as they tend to be controlled by a capacitor and H bridge anyway. You should have far far better results using fine tolerance wire. Twists in the wire when winding also can make a difference sometimes, as it can put strain on the corners, when stretched this produces inaccuracies in width of the wire but to be honest you'll probably never stretch it that far (tension will just snap the wire before it narrows), just some industrial experience if I can offer any. Regarding the tolerance though, you'll often find a figure like "+/- 0.01mm", try to get that number as small as possible within reason.

Best regards
DK

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,65709.msg322013.html#msg322013

That's fantastic, gratz. Recommends a good ol' bottle of RTM with a few electronics books on impedance and fields. You can pick this up to a science quite easily, lots of engineering books cover it, might just be me being a bookworm, I studied this all throughout college and university. I'm no detectorist but I want to get into geology, and I have a huge background in mechatronics engineering and smithing so I'll keep an eye out on this thread if I get the time. This thread caught my eye because I build my own circuits from scratch, using either perfboard with Kynar, or designing my own PCBs and etching them, I am very proficient in C, Java, Arduino and AVR's version of C. I have experience burning chips (not the potato kind), and knowledge of interfaces used throughout the Arduino market. I don't have professional facilities yet but I'm working on some things that will help me do it easier. I've repaired dozens upon dozens of monitors, and some old audio equipment, built devices, and also computers for a living, hope I can be of help. (Woops, half of this belongs in Introductions! Nevermind.)

Best regards
DK

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,65709.msg322019.html#msg322019