Voodoo Main Discussion

[6666]

@6666 I did a search for DSR coil and did not find anything. I would like to learn about these if you could point me towards some information. Thanks.

yep, take note of the marks they give the relative dimensions. DSR make an all singing all dancing imaging detector.

[surfdetector]

yep, take note of the marks they give the relative dimensions. DSR make an all singing all dancing imaging detector.

Thanks for the diagram. Have you made one of these? I would be interested in knowing some specs. Thanks again.

[6666]

Thanks for the diagram. Have you made one of these? I would be interested in knowing some specs. Thanks again.

I just noticed who ever made the diagram labelled it wrong. its DRS, but they make a machine called "Ground Exper PRO" which is what I search on, there is a lot of info on them.
Basicly with the coil, look at the marks, for any given TX coil, the RX length = the radius , the RX width = half the radius, so for an 8 inch TX the RX would be 4x2, for PI the TX can be 300uH, the RX can be 300-450uH, and adjust for IB .
For the Voodoo I will be trying TX 300uH, RX about 1.2mH plus cap and see if it will IB,
to print the ellipse shape I use https://www.rapidresizer.com/home/20...ne-shape-maker

[surfdetector]

I just noticed who ever made the diagram labelled it wrong. its DRS, but they make a machine called "Ground Exper PRO" which is what I search on, there is a lot of info on them.
Basicly with the coil, look at the marks, for any given TX coil, the RX length = the radius , the RX width = half the radius, so for an 8 inch TX the RX would be 4x2, for PI the TX can be 300uH, the RX can be 300-450uH, and adjust for IB .
For the Voodoo I will be trying TX 300uH, RX about 1.2mH plus cap and see if it will IB,
to print the ellipse shape I use https://www.rapidresizer.com/home/20...ne-shape-maker

The shape maker tool is very handy.
Cheers

[Altair]

I just noticed who ever made the diagram labelled it wrong. its DRS, but they make a machine called "Ground Exper PRO" which is what I search on, there is a lot of info on them.
Basicly with the coil, look at the marks, for any given TX coil, the RX length = the radius , the RX width = half the radius, so for an 8 inch TX the RX would be 4x2, for PI the TX can be 300uH, the RX can be 300-450uH, and adjust for IB .
For the Voodoo I will be trying TX 300uH, RX about 1.2mH plus cap and see if it will IB,
to print the ellipse shape I use https://www.rapidresizer.com/home/20...ne-shape-maker

Hi 6666,
thank you for share this informations.
I think that DRS coil type could be suitable to the Woodoo principle. Very interesting cue.

[6666]

Hi 6666,
thank you for share this informations.
I think that DRS coil type could be suitable to the Woodoo principle. Very interesting cue.

Your welcome, please let us know any results if you try it, thanks

[SilverSurfer17]

this is coil i started building but instead of 22 gauge i used 20 its what i had for the tx coil and for the rx i used 30 instead of 32 and he made his rx 3 1/4 inches i made mine 3 1/2 and i thought when i would put it in the coil calc it would come out with more inductance then he got because i used 1 sized thicker wire and would just take a turn or two off to get the same inductance but its not its 450 turns and is 28 instead of 35MH

[SilverSurfer17]

thats what i typed in and wound ten extra turns but ended up with 28MH ?

[SilverSurfer17]

And whats weird is i used a 3 1/2 inch form he said 3 1/4 and i typed in for 30 gauge instead of 32 gauge but its the same exact amount of turns to get the same inductance

[Qiaozhi]

[ATTACH]54293[/ATTACH] thats what i typed in and wound ten extra turns but ended up with 28MH ?

22 AWG wire is 0.6246 mm, not 0.254 mm.
If you put that into the coil calculator it gives an inductance value of 27.762mH, which is essentially 28mH!

20 AWG wire is 0.8128 mm.

[SilverSurfer17]

That was for the 30 gauge rx coil not the tx the tx is 20 gauge i think its in a 1/2 inch being off somewhere thats why i asked hes calling it a 8 inch coil but the tx is 7 1/2 and the rx isn't 4 inch its 3 1/4 Yours was the same in the book using 3 inch instead of 3 1/2 for that 7 inch coil why is whats the point of them being not what they are suppose to be and the coil calc where it asks for the inner radius is that the od of the coil form and the inner of what the coil is thats the only thing i can think of i did wrong 3 1/2 inches half is 1.75 inches converted to mm 44.45

[Qiaozhi]

That was for the 30 gauge rx coil not the tx the tx is 20 gauge i think its in a 1/2 inch being off somewhere thats why i asked hes calling it a 8 inch coil but the tx is 7 1/2 and the rx isn't 4 inch its 3 1/4 Yours was the same in the book using 3 inch instead of 3 1/2 for that 7 inch coil why is whats the point of them being not what they are suppose to be and the coil calc where it asks for the inner radius is that the od of the coil form and the inner of what the coil is thats the only thing i can think of i did wrong 3 1/2 inches half is 1.75 inches converted to mm 44.45

The coil calculator requires the inner radius of the loop. It will then gives you the mean radius and the coil thickness. Obviously the outer radius is then equal to the inner radius plus the coil thickness.

[SilverSurfer17]

When you say loop you mean the inner radius of the coil being built right if so thats what i did so now that its 28.8 instead of the 35mh what does that change in the rx coil besides resistor and cap the frequency also now i dont know what to do to check the tx because i dont want to chop it off the roll i guess ill have to buy more 30 gauge and rewind it again with more loops and figure out how i got around 45 loops short from being where im suppose to be at

[Qiaozhi]

In a concentric coil (for example) there are 3 loops - the TX, RX and nulling. The coil is the whole thing.
In a DD coil, there are 2 loops - the TX and RX.

[MartinB]

I just noticed who ever made the diagram labelled it wrong. its DRS, but they make a machine called "Ground Exper PRO" which is what I search on, there is a lot of info on them.
Basicly with the coil, look at the marks, for any given TX coil, the RX length = the radius , the RX width = half the radius, so for an 8 inch TX the RX would be 4x2, for PI the TX can be 300uH, the RX can be 300-450uH, and adjust for IB .
For the Voodoo I will be trying TX 300uH, RX about 1.2mH plus cap and see if it will IB,
to print the ellipse shape I use https://www.rapidresizer.com/home/20...ne-shape-maker

Thanks 6666, really useful web site