Vinyl LP Coil Form

[chudster]

Dear Forum Members,

In looking at home made coils I came across this thread.

http://crystalradio.net/spiderweb/index.shtml

Interesting idea to use a CD as a removable form but they are too small for most detector coils. It got my thinking that an old laser disc picked up from a garage sale would do the trick as a removable form (save having to remove the metal foil) or a vinyl LP for a permanent form.

In searching and googling I have found nothing about this.

What is the opinion? Would an old vinyl LP be suitable and has anyone done that or might vinyl not be a good material? What other readily available coil forms might work?

It would be a fitting end for some LPs I can think of ......

Chudster

[Midas]

Dear Forum Members,

In looking at home made coils I came across this thread.

http://crystalradio.net/spiderweb/index.shtml

Interesting idea to use a CD as a removable form but they are too small for most detector coils. It got my thinking that an old laser disc picked up from a garage sale would do the trick as a removable form (save having to remove the metal foil) or a vinyl LP for a permanent form.

In searching and googling I have found nothing about this.

What is the opinion? Would an old vinyl LP be suitable and has anyone done that or might vinyl not be a good material? What other readily available coil forms might work?

It would be a fitting end for some LPs I can think of ......

Chudster

Hi Chudster,

I agree, my folks certainly have a cupboard full of LP's which up till now have only been good for occasional skeet shooting (you know, first press Beatles albums, that sort of rubbish). Vinyl is probably as good a material as any, most glues don't really stick to it. If you want a really repeatable form then something to set the spacing between pie-segments would be a good idea.

To be honest though I've yet to be sold on the basket weave arrangement. You'll certainly get low capacitance which means high speed, which is good but all that spacing has to reduce your magnetic field intensity too. So yeah, dunno, perhaps better for really small targets, otherwise worse ? Anyone ever actually read or done any definitive performance comparisons?

Midas

[IBGold]

You want something with a low dielectric constant that is why I use Styrofoam for my coil formers I have tried basket-weave coils with rigid Styrofoam sheet but was not overly impressed with the basket weave design over a standard Mono my five cents worth.

Regards, Ian.

[Midas]

You want something with a low dielectric constant that is why I use Styrofoam for my coil formers I have tried basket-weave coils with rigid Styrofoam sheet but was not overly impressed with the basket weave design over a standard Mono my five cents worth.

Regards, Ian.

Di-electric constant is moot. The form is re-usable ie. designed to be removed.
Thanks for your sharing your experience with the basket weave. That's one result in the negative.

Midas

[Davor]

Funny but yesterday I was thinking of the ways to make a DD coil with the overlap straight but in spiral web style. My idea was that if the overlap is spread then I'll obtain a bit more spiky response for small targets using the concentrated field in the proximity of the overlap wires. The rest of the coil could be wound densely packed for flexibility.

[satdaveuk]

Hi Chudster,

I agree, my folks certainly have a cupboard full of LP's which up till now have only been good for occasional skeet shooting (you know, first press Beatles albums, that sort of rubbish). Vinyl is probably as good a material as any, most glues don't really stick to it. If you want a really repeatable form then something to set the spacing between pie-segments would be a good idea.

To be honest though I've yet to be sold on the basket weave arrangement. You'll certainly get low capacitance which means high speed, which is good but all that spacing has to reduce your magnetic field intensity too. So yeah, dunno, perhaps better for really small targets, otherwise worse ? Anyone ever actually read or done any definitive performance comparisons?

Midas

You got to be on some form of substance to be even mentioning distroying original beatles albums, and to add to that your talking about the master cut versions on original lables not pressed ones that have been duplicated all over the world.
If your serious about possesing them Pm me and I will buy the lot off you for a agreed amount cash, as im a private collector of beatles mania.
I got all the monthly mags that they produced from start to finsh, numbrious single 45s and albums plus personally signed autographed posters.
You calling them rubbish is like calling Tesla a goof, they were all gifted song writters and instrument players who wrote songs for almost every band or solo singer of the 60s-70s and still sung to this day, who had personal no1s at anyone time covering the globe, sometimes and not uncommon they were holding the 7 slots at once, never before done in history since records of sales began.
Without the beatles you wouldnt never had pop music, like rock is to the king Elvis, pop means incase you dont know, popular music, its all classic stuff and will never die.
I was fortunate to live in that time as a teenager proper music with lyrics when there was no audio/visual cover ups for mistakes, as a band back then you need to be able to play a instrument, not like these days with gloryfied karryoky what ever you want to call it, these boys worked very hard all hours to get from poverty in liverpool UK to stardom dotting around the globe which lasted decades and still to this day, often I hear these manufactured boy bands trying to sing a song which paul or john had written years ago but the younger generations proberly dont know that.
Anyway im very serious about buying those albums off you if infact you have them, PM me: [email protected] and we can do a deal, then you can forget about making a coil cause you can buy a few manufactures ones with the proceeds.
Happy day for all
All the best

[satdaveuk]

Hi made this one its all made out of styreen, easy peezy.. light, easy to cut, durable, cheap as soggy chips.

All you need is compass, fret saw, common sense and a drill.


This was a copy of the Barracuda.
Cut the three disks the 1 off small thickness as required in the centre cement glue surfaces clamp till dry, then wind hes your uncle and fanny is your aunt finshed

3 parts 2 x 8" outers and 7.5" inner and wire as spec required.


If you really want to get sexy with it to look more moden and a tad lighter cut a nice size hole out the center.
Just realized the first two were the copy of the original Barracuda, the third picture is 10" which I made earlier this year for the Mini pulse3 which is different parameters which also included a faraday shielding, but still made of all styreen.
Something ive proven and mentioned before, when using laminated wire ie: transformer wire, dont go over the top on tightness when winding, keep it firm and regular but dont wind like you would when manufacturing a IB coil, because if you do you will screw up performance big time.
Firstly and most importantly you will greatly increase interwinding capacitance, secondly you will proberly not got the resistance/inductance ratio as required because thum rule= tighter more inductance less resistance.
Once done just hospital bandage and loads of yaht varnish and you will be well impressed

[Midas]

You got to be on some form of substance to be even mentioning distroying original beatles albums, and to add to that your talking about the master cut versions on original lables not pressed ones that have been duplicated all over the world.
If your serious about possesing them Pm me and I will buy the lot off you for a agreed amount cash, as im a private collector of beatles mania.
I got all the monthly mags that they produced from start to finsh, numbrious single 45s and albums plus personally signed autographed posters.
You calling them rubbish is like calling Tesla a goof, they were all gifted song writters and instrument players who wrote songs for almost every band or solo singer of the 60s-70s and still sung to this day, who had personal no1s at anyone time covering the globe, sometimes and not uncommon they were holding the 7 slots at once, never before done in history since records of sales began.
Without the beatles you wouldnt never had pop music, like rock is to the king Elvis, pop means incase you dont know, popular music, its all classic stuff and will never die.
I was fortunate to live in that time as a teenager proper music with lyrics when there was no audio/visual cover ups for mistakes, as a band back then you need to be able to play a instrument, not like these days with gloryfied karryoky what ever you want to call it, these boys worked very hard all hours to get from poverty in liverpool UK to stardom dotting around the globe which lasted decades and still to this day, often I hear these manufactured boy bands trying to sing a song which paul or john had written years ago but the younger generations proberly dont know that.
Anyway im very serious about buying those albums off you if infact you have them, PM me: [email protected] and we can do a deal, then you can forget about making a coil cause you can buy a few manufactures ones with the proceeds.
Happy day for all
All the best

Sorry Sadveuk, I was just joking around.

For the record:
I actual don't mind the Beatles. My parents do have quite a lot of their records, but probably not first presses. No, they probably aren't interested in selling them, and they certainly wouldn't give me the cash if they were.

Just out of interest and certainly very off topic (sorry Chudster) They don't seem to be as valuable as I thought. This one only went for $40:
http://www.popsike.com/Beatles-White...657082312.html

Midas

[homefire]

Vinyl would not make the Sun we have here.

You would end up with a Floppy Pan Cake.

[satdaveuk]

Sorry Midas I thought you were been serious lol
Ever whos bought that record has made a investment of a life time, I kid you not that was givin away, the man who was selling it should have put it to aution in one of big known aution rooms like sotherbe or bonams etc, wouldnt of suprised me to have fetched hundreds of pounds if the right person was there on the day, by selling on ebay you cant look close and get the feel of it, the person who bought that just took a chance on it.
Im really peeded now, didnt think for one miniute id see a white album for sale on ebay, would have bought that and kept it forever.
Actually hes paid about the same as it cost when new maybe a bit less because any cut record of that time was £30-£35 GB.

[satdaveuk]

Vinyl would not make the Sun we have here.

You would end up with a Floppy Pan Cake.

You lucky thing, thats one problem we dont have here cause its always raining, so you need extra robust water proofing for body and detector

[homefire]

120F you can fry eggs on your truck roof in about 1 minute flat.

Just a bit of Butter is all you need. LOL

[Freddy67]

The Beatles transformed into detector search head
They should be glad to hear that.

[chudster]

[ATTACH]21582[/ATTACH]

The Beatles transformed into detector search head
They should be glad to hear that.

So what I have learned.

1) Styrene foam is the choice material for a permanent form.
2) Spiderweb coils would be fast but have poorer performance than other types most likely due to magnetic field for detecting.
3) Vinyl may be a poor choice for heat and weight reasons.
4) An LP probably works as a removable form.
5) It should not be a rare beatles pressing or satdaveuk will be distraught and/or angry.
6) Hammond organ favourites or Barry Manilow are probably best.

CHudster

[mykaitch]

Is it possible that different LPs are better than others (for coils I mean).
Is Dark side of the moon better than Barry Manilow in concert ?
Maybe The Supremes at the Copa works better than Disraeli Gears ?
I must go and test The Beach Boys pet sounds against Exile on Main Street.
Got a lot of research to do now....