coil generator : tester of coils

[kt315]

GBL copper bottom layer
GBR board outline
TXT routing and drill

[kt315]

you can check files online http://www.gerber-viewer.com/

[Tibuck19]

GBL copper bottom layer
GBR board outline
TXT routing and drill

Thank you KT, it really helped having a real physical one to compare with that im trying to do . here the results, and I feel I can improve by at least 15%. Have a look

[Tibuck19]

you can check files online http://www.gerber-viewer.com/

I use flatcam to open the Gbr files and export to .SVG then in Freecam I import the SVG and extrude the vector and export as STL, then I just run it on my 3dprinter. but it seems like a lot of work lol when you think it takes only a few seconds to use a laser printer and ink transform to a copper board lol Lucky I have other uses for it in mind.

[kt315]

Hello to all
I have some questions that I would like to thank for help


In general, there are two Rx coil coupling structures that are:


1) Parallel tank resonance circuit (TGSL and ELDORADO and RAPTOR devices)
2) series Tank resonance circuit (CIBOLA, TEGON and FORTUNE devices)
I've taken photos of these two different structures.


1) What is the difference between the two parallel and serial connection structures in the Rx VLF metal detector coil?
2) Why did TESORO's older machines use parallel tank structures, but used end-of-series tank resonance series?

[ATTACH]45115[/ATTACH] [ATTACH]45116[/ATTACH] [ATTACH]45117[/ATTACH]
[ATTACH]45118[/ATTACH] [ATTACH]45119[/ATTACH]

transfer this post here. looks people want to be in the darkness of the ignorance.

[6666]

Hello KT315, do you have any spare PCB's for this coil tester for sale ? thanks

[kt315]

hello 6666

i have whole batch. as i wrote if anyone buys dp or bara pcb the cost of the board is 2 euro.
i am selling it on ebay for 5USD and 3USD sending. buy op amp tester one and this board 2 euro + 2 euro
+3 euro for shipping if you want.

if you do fee from my side add 1euro to the cost.

my paypal [email protected]

thank you

[6666]

hello 6666

i have whole batch. as i wrote if anyone buys dp or bara pcb the cost of the board is 2 euro.
i am selling it on ebay for 5USD and 3USD sending. buy op amp tester one and this board 2 euro + 2 euro
+3 euro for shipping if you want.

if you do fee from my side add 1euro to the cost.

my paypal [email protected]

thank you

Thanks KT, I will buy one coil tester pcb and one op amp tester pcb, + postage , total cost seven euro
I will do the fee,
I will email you my address
thanks
cheers

[6666]

Thanks KT, I will buy one coil tester pcb and one op amp tester pcb, + postage , total cost seven euro
I will do the fee,
I will email you my address
thanks
cheers

Email sent, just transferring some funds into paypal

[kt315]

ok. do please payment. i will see.

thank you

[moorejl57]

Another simple circuit to look at for coil resonance http://pyams.blogspot.com/2017/05/th...scillator.html

[moorejl57]

A better explaination https://wiki.analog.com/university/c...-lab-peltz-osc

[6666]

Hi KT315 paypal sent

[6666]

Another simple circuit to look at for coil resonance http://pyams.blogspot.com/2017/05/th...scillator.html

It would be interesting to test this, I would imagine that a buffer would be needed in the output so not to load the circuit.

[moorejl57]

It would be interesting to test this, I would imagine that a buffer would be needed in the output so not to load the circuit.

The link in post #132 includes a LTSpice file to test with. You can simulate a 10X probe (10M and 20pf in parallel) load and see what happens to the frequency.